wayground logo

Free Printable Worksheets

Font size

S
M
L
XL
Worksheets

Achem

Total questions: 210

Worksheet time: 2hrs 53mins

Name
Class
Date
1.

What do you call a combination of two or more materials which retain their individual properties and can be separated by physical means

a)

solvents

b)

reactions

c)

solutions

d)

mixtures

2.

A polar solute usually dissolves in a polar solvent and non polar solute usually dissolves in a non polar solvent. This is

a)

Hunds rule

b)

Solubility rule

c)

Henrys Law

d)

the like dissolves like rule

3.

What is the molarity of a solution containing 72.9 grams of HCl is enough water to make 500 ml of solution

a)

2.0 m/L

b)

4.05 m/L

c)

5.0 m/L

d)

4.05 g/L

4.

The determination of the equilibrium constant of a colored species can be done via which technique?

a)

Conductance

b)

Ion-exchange

c)

Electrophoresis

d)

Spectrophotometry

5.

A solution has 3X10^-4 copper 2+ content. How much is the copper 2_+ content in ppm?

a)

3 ppm

b)

9 ppm

c)

19 ppm

d)

38 ppm

6.

Solution of electrolytes and metals are

a)

Insulators

b)

Negative

c)

Polar

d)

Conductors

7.

The recommended procedure for preparing a very dilute solution is not to weigh out a very small mass or measuring a very small volume of a stock solution. Instead it is done by a series of dilutions. A sample of 0.8214 g of KMnO4 (158.04) was dissolved in water and made up to the volume in a 500- ml volumetric flask. A 2.000-ml sample of this solution was transferred to a 1000-ml volumetric flask and diluted to the mark with water. Next, 10.00 ml of the diluted solution were transferred to a 250-ml flask and diluted to the mark with water. What is the concentration (in molarity) of the final solution? 


a)

0.1039 M

b)

2.079 x 10^-5 M

c)

8.316 X 10^-7 M

d)

NONE OF THESE

8.

How much of 2.0 M stock solution do you need to prepare 50 ml of 1.0 M solution

a)

25 ml

b)

75ml

c)

30 ml

d)

50 ml

9.

A statement that sums up what you learned from an experiment and states if the hypothesis is proven and disproven is called

a)

procedure

b)

hypothesis

c)

control group

d)

conclusion

10.

A prediction or a possible explanation to the question or problem which can be tested in an experiment is called

a)

hypothesis

b)

graph

c)

procedure

d)

data

11.

The number of 2.34 x10^-7 is the scientific notation for

a)

234000

b)

23400000

c)

23400

d)

2340000

12.

Express the number 0.051065 to four significant figures

a)

0.051

b)

0.05106

c)

0.051

d)

0.0511

13.

The volume of a liquid is 20.5 mL. Which of the following sets of measurement represents the value with good accuracy? 


a)

19.2 mL, 19.3 mL, 18.8 mL, 18.6 mL 

b)

18.9 mL, 19.0 mL, 19.2 mL, 18.8 mL

c)

18.6 mL, 17.8 mL, 19.6 mL, 17.2 mL 

d)

20.2 mL, 20.5 mL, 20.3 mL, 20.1 mL 

14.

What is the chemical formula of diphosphorus monobromide? 

a)

PBr2

b)

P2Br2

c)

PBr

d)

P2Br

15.

Which of the following is a chemical reaction?

a)

an airconditioner cooling the air. 

b)

none of these choices 

c)

bleaching your clothes 

d)

melting of ice

16.

Noble gases are inert because they have completed outer electron shells. Which of these elements isn't a noble gas? 

a)

Chlorine

b)

Krypton

c)

Helium

d)

Argon

17.

What is the most common isotope of hydrogen?

a)

Hydrogen is the most common type of isotope

b)

Tritum

c)

Deutrium

d)

Protium

18.

As you move from top to bottom down the periodic table 

a)

change in atomic radius cannot be predicted 

b)

electronegativity decreases

c)

 ionization energy increases

d)

atomic radius decreases 

19.

What do you call an atom that has more protons than electrons?

a)

An anioN

b)

Molecule

c)

None of these

d)

Cation

20.

Which one of the following is a chemical equation

a)

CO2

b)

Ice + heat = water

c)

C + O2 = CO2

d)

iron + oxygen = rust

21.

As you move from left to right across the periodic table 


a)

atomic radius Increases 

b)

electronegativity decreases

c)

ionization energy decreases

d)

atomic radius decreases

22.

Balance the following equation:Ag + O2 → Ag2O 

a)

Put a 2 in front of Ag 

b)

Add a 4 in front of Ag and a 2 in front of Ag2O 

c)

Add a subscript 2 to the end of Ag2O 

d)

Add a 2 in front of Ag and a 1 in front of. Ag2O

23.

hich is NOT an acceptable name for HgCl2

a)

Mercury II chloride

b)

Mercurous chloride

c)

Mercury I Chloride

d)

Dimercury Chloride

24.

Under the Lewis concept of acids and bases, an acid is

a)

An electron pair donor

b)

a proton donor 

c)

a proton acceptor 

d)

an electron pair acceptor

25.

Which of the following is NOT an acid?

a)

milk of magnesia 

b)

milk 

c)

apple juice

d)

gastric juice 

26.

Which of the following is NOT an acid-base conjugate pair?

a)

NH3 and NH,*

b)

H2O and OH

c)

H2S and OH 

d)

HCN and CN 

27.

When NH.CI hydrolyzes, the resulting solution is 

a)

Acidic

b)

Basic

c)

Neutral

d)

None of these

28.

Aqua regla, the reagent that can be used to dissolve gold, is a 3:1 mixture of which acids?

a)

hydrochloric and nitric acids

b)

hydrofluoric and nitric acids 

c)

hydrochloric and sulfuric acids

d)

hydrochloric and sulfuric acids 

29.

Which of the following conjugate acid/base pairs should be used to prepare a buffer with pH near 7.15? 

a)

Formic acid / sodium formate (pKa – 3.74)

b)

Sodium dihydrogen phosphate/ sodium hydrogen phosphate (pKa2 = 7.20) 

c)

Succinic acid/sodium succinate (pKa = 5.64)

d)

Glycylglycine / sodium glycylglycate (pKa = 8.35)

30.

Predict the products of the following acid-base reaction: NH1(aq) + HNO3(aq)

a)

no reaction takes place 

b)

NH2OH(aq) + HNO2(aq) 

c)

NH4OH(aq) 

d)

NH4NO3(aq)

31.

What is the gas which behaves the most like an ideal gas?

a)

Oxygen

b)

Helium

c)

Nitrogen

d)

Hydrogen

32.

 What happens to the volume of a fully inflated balloon when it is taken outside on a cold day? 


a)

its volume decreases

b)

volume increases

c)

remains the same

d)

volume becomes equal to zero

33.

The standard pressure of the atmosphere at sea level is

a)

760 mm Hg 

b)

760 torr

c)

all of the choices

d)

1atm

34.

Each of these flask contains the same number of molecules. In which container is the pressure highest?

a)

Flask 2

b)

Flask 1

c)

Flask 3

d)

Flask 4

35.

What is the molar mass of an unknown gas if 11.60 grams of the gas occupies volume of 2.24 at STP?

a)

35.8 g/mol

b)

16.0 g/mol

c)

160 g/mol

d)

81.0 g/mol

36.

When chromium changes from an oxidation state of +3 to that +6 the Cr3 must.

a)

gain 3 electrons

b)

lose 3 electrons

c)

lose 6 electron s

d)

gain 3 electrons

37.

In an electrolytic cell oxidation occurs

a)

at the anode

b)

between cathode and anode

c)

either cathode and anode

d)

at the cathode

38.

For this reaction Mg + H2O = Mg0 + H2

a)

H is the oxidizing agent

b)

Mg is the oxidizing agent

c)

Mg lost electrons

d)

H gained electrons

39.

Which procedure is recommended for reading the level of an aqueous solution in a buret or graduated cylinder?

a)

Keep the eye level with the top of the meniscus and record that reading

b)

Read both the bottom and top of the meniscus and average those readings

c)

Keep the eye level with the bottom of the meniscus and record that reading

d)

Look down at the meniscus at an angle to obtain the average reading directly 


40.

What is the Main ISO standard used by testing and calibration laboratories to gain accreditation and formal recognition of their competence to carry out tests and/or calibrations, including sampling? 


a)

ISO/IEC 17025 

b)

AOAC 

c)

EURACHEM

d)

IS0 9000:2000

41.

This detects contamination from reagents, sample handling, and the entire measurement process. 


a)

matched-matrix blank 

b)

solvent blank

c)

method blank

d)

calibration blank

42.

There is a definite correlation between orderliness and level of safety in the laboratory. In addition, a disorderly laboratory can hinder or endanger emergency response personnel. Which of the following housekeeping rules should NOT be adhered to? 


a)

never obstruct access to exits and emergency equipment

b)

properly label and store all chemicals 

c)

store chemical containers on the floor 

d)

clean work areas, including floors, regularly 

43.

In order to ensure an accurate weighing when using the balances, one should 

a)

leave the object on the balance for several minutes to ensure a stable reading

b)

not lean on the balance bench, close the draft doors on the balance and zero the balance prior to weighing

c)

turn the balance off to clear any previous weighings from its memory 

d)

turn the balance off to clear any previous weighings from its memory 

44.

Which of the following is NOT part of the technique for pouring in a laboratory? 

a)

Connect the pouring spout and receiving container using a stirring rod 

b)

Pour fast enough to avoid spills 

c)

Pour and allow the liquid to run along the stirring rod

d)

Hold containers at arms length, with elbows slightly bent

45.

The method that is widely used for the determination of the protein content of meat and animal food is the 


a)

Kjeldahl method 

b)

McBride method 

c)

Mohr method 

d)

Liebig method 

46.

What os the %w/w H2O in the cheese if the final mass was found to be 545.8 mg

a)

35.23 %

b)

30.6 %

c)

31.45%

d)

37.65%

47.

An analytical chemist needs to transfer his/her precipitants from the beaker to the filter paper. Which of the following would be the best procedure to adopt in order to ensure a quantitative transfer of the precipitate?

a)

None of the choices

b)

Most of the liquid above the ppt is decanted first, then bulk of ppt is transferred to filter paper through a stirring rod, the beaker is washed with big volumes of wash solution. 

c)

Most of the liquid above the ppt is decanted frst, bulk of the ppt is transferred through a stirring fod, wash the beaker several times with small volumes of wash solution. 

d)

Solution is shaken, then immediately filtered; beaker is washed with relatively big volumes of wash solution. 

48.

A water sample is collected for analysis of oil and grease. The analysis will not be done Immediately. The sample should NOT be 


a)

collected in plastic bottle

b)

refrigerated til analyzed 

c)

preserved with sulfuric acid 

d)

collected in all glass bottle 


49.

When two materials that have different densities, like oil and water, encounter one another, they  will

a)

separate according to their densities

b)

exchange densities

c)

mix uniformly

d)

repel one another 


50.

Conductivity is defined as 

a)

The ability of a substance to conduct electric current, which is the same as resistivity 

b)

The ability of a substance to repel electric current 

c)

The ability of a substance to conduct variable resistance 

d)

The ability of a substance to conduct electric current, which is the reciprocal of resistivity

51.

Even though all solid states of other materials are denser than the liquid states of materials, what is a unique property of water?

a)

It is clear 

b)

It is tasteless 

c)

Solid water (ice) is less dense than liquid water (ice floats in water) 

d)

It can freeze 

52.

he following statements are true about electrical conductivity EXCEPT 

a)

a measure of a solution s capacity to conduct electricity 

b)

a measure of the total dissolved solids in a solution 

c)

increasing temperature has no effect on its value

d)

is directly affected by temperature 

53.

The following statements are true about pH EXCEPT 

a)

the negative logarithm of hydrogen ions content in a solution 

b)

a measure of the acidity or alkalinity of a solution 

c)

a measure of the amount of hydrogen ions in solution

d)

does not change when there are changes in temperature 

54.

In maintenance and storage of pH meters, which of the following procedure shall NOT be done?

a)

Mild soap solution may be used in general cleaning of the electrodes

b)

To keep the electrode bulb moist during storage, store the electrode in distilled water. 

c)

 Blot the electrode dry after rinsing the pH electrodes. 

d)

 Rinse pH electrodes in between measurements. 

55.

In operating a UV-Vis spectrophotometer, the following shall be done, EXCEPT for 

a)

Before turning on the power, check if the sample holder does not contain anything

b)

After turning on, allow the spectrophotometer to initialize and stabilize according to its user manual. 

c)

If there are any spillage that gets onto the instrument, immediately wipe it away

d)

Keep the sample compartment open during measurement.

56.

In using fume hoods, the following shall be done, EXCEPT for 

a)

Items contaminated with odorous or hazardous materials should be removed from the hood only after decontamination or if placed in a closed outer container to avoid releasing contaminants into the laboratory air.

b)

he hood shall be kept closed, except during apparatus set-up or when working within the hood.

c)

The hood may be used as a permanent storage area for volatile chemicals when an appropriate storage cabinet is not available. 

d)

Ensure the exhaust is operating before using the hood. 

57.

In purifying a material by crystallization choose the solvent according to the following EXCEPT

a)

solubility

b)

reactivity

c)

vapor pressure

d)

polarity

58.

The dynamic range in analytical measurement refers to the range where 


a)

the instrument reading is constant 

b)

the detection limit lies 

c)

the sensitivity of the instrument is highest

d)

the instrument reading is linearly related to the input value 

59.

What is the law that states the linear relationship between absorbance and concentration of an absorbing species? 


a)

Boyles LAw

b)

Charles Law

c)

Beer Lamberts Law

d)

Avogrados Law

60.

Determine the actual volume contained in a 50.0 mL volumetric flask given the following data: Mass of water: 50.1227 g, Density of water at 25 C: 0.99707 g/mL 


a)

50.27 ml

b)

50.17 ml

c)

50.37 ml

d)

50.45 ml

61.

A lab analyst dissolved 4.021 g of NaOH in water and made up the solution to 1 litre with water. He then pipetted 10.00 mL of this solution into a flask and titrated it with 0.050 M HCl solution from a burette. A volume of 20.32 mL of acd had been used at the endpoint. Examining this result, the lab supervisor could deduce that 

a)

the NaOH absorbed H2O from the air after its mass was measured 

b)

the burette was rinsed with water instead of HCI 

c)

the analysis is as accurate as can be expected using this apparatus 

d)

 the pipette was rinsed with water instead of NaOH 

62.

In which of the following titrations does pH = 7.0 occur at the equivalence point? 


1.Strong acid/strong base 

II. Weak acid/Strong acid

III. Strong acid/Weak Base

a)

I only

b)

II and III only

c)

III only

d)

II only

63.

The following are good sampling practices EXCEPT 

a)

Collect the sample in a container made of material that will chemically react with the sample.

b)

Sample frequently enough to allow for the identification of process cycles.

c)

Take several increments and composite them to form the sample. 

d)

If possible, mix the material before getting the sample. 

64.

 In liquid-liquid extraction, it is often necessary to determine which liquid is aqueous and which liquid is nonaqueous. To test the liquids, add a drop of water to the top layer. If the drop dissolves in the top layer, the top layer is 


a)

aqueous

b)

miscible

c)

denser

d)

non aqueous

65.

The process in which the sample is heated to the boiling point of the solvent and volatile analytes are concentrated in the vapour phase, condensed and collected. 

a)

distillation

b)

evaporation

c)

liquid - liquid extraction

d)

oven drying

66.

Glass container is NOT suitable for 


a)

oil and grease determination

b)

all of the choices

c)

microbiological analyses

d)

inorganic trace analyses

67.

The maximum holding time for acid preserved samples that will be subjected to determination of 


a)

48 hrs

b)

6 months

c)

3 months

d)

1 week

68.

The substance which does the dissolving and must be greater than 50% of the solution is called 


a)

solute

b)

solvent

c)

mixture

d)

solution

69.

Quantitative chemical analysis of weighing a sample, usually of a separated and dried precipitate 


a)

Gravimetric Analysis

b)

Elemental Analysis

c)

Volumetric Analysis

d)

Titrimetric Analysis

70.

Which of the following is a primary standard for use in standardizing bases?

a)

Acetic Acid

b)

Potassium Hydrogen Phthalate

c)

Sulfuric Acid

d)

Ammonium Hydroxide

71.

How many grams of Sodium Persulfate (Na2S2O) are required to prepare a 1 L solution of Sodium Persulfate with concentration of 10% (w/v). This solution is widely used as oxidizing reagent for Total Organic Carbon analyzer (TOC). 

a)

100 g Sodium Persulfate

b)

102 g of Sodium Persulfate

c)

101 g of Sodium Persulfate

d)

99 g of Sodium Persulfate 

72.

How many grams of sodium hydroxide is needed to prepare 500 mL of 0.5 N sodium hydroxide? (Sodium 22.99 g/mole, Oxygen- 16.00 g/mole, Hydrogen= 1.008 g/mole) 

a)

13.8115 g 

b)

 9.9995 g 

c)

15.7470 g

d)

10.2515 g 

73.

What is the light source used in the visible range to 340-1000 nm ? 


a)

Nerst Blower

b)

Deutrium

c)

Tungsten

d)

Incandescent

74.

Minimum concentration of a substance that can be measured and reported with 99% confidence that the analyte concentration is greater than zero refers to

a)

Lower Warming Limit

b)

Lower Control Limit

c)

Method Detection Limit

d)

Limit of Quantitation

75.

Which of the following instruments uses a cuvette? 


a)

Gas Chromatography

b)

ph meter

c)

UV Vis Spectrometer

d)

Flame AAS

76.

The most appropriate technique to determine levels of the Pb2+ ion in blood is 

a)

Atomic Absorption Spectroscopy

b)

Mass Spectrometry

c)

Infrared Spectroscopy

d)

High Performance Liquid Chromatography

77.

Analytical methods or instruments' performance aim for 

a)

Low signal-to-noise ratio 

b)

Low dynamic range 

c)

High variability 

d)

High signal-to-noise ratio 

78.

A graphical representation of measuring signal as a function of quantity of analyte is called 

a)

Absorbance Chart

b)

Calibration Curve

c)

None of the choices

d)

Quality Control Chart

79.

For the reaction, Fe3(aq) + SCN ̈(aq) <=> FeSCN2+(aq) 

reaction can best be determined by means of 


a)

lon-exchange 

b)

Spectrophotometry 

c)

Conductance

d)

Chromatogrpahy

80.

. A food scientist has a sample of a plantoil and wants to determine if the oil contains saturated or unsaturated fatty acids. Which of the following spectroscopic techniques would be most useful for this purpose? 

a)

mass spectroscopy 

b)

infrared spectroscopy 

c)

ultraviolet spectroscopy 

d)

visible spectroscopy 

81.

What is a graph showing the detectors response as a function of elution time: band's shapes, position, resolution? 


a)

monitor display

b)

quality control chart

c)

 chromatogram

d)

calibration curve

82.

. A stable light source in AAS analysis, which is necessary to emit the sharp characteristic spectrum of the element to be determined is called

a)

Tungsten lamp 

b)

deuterium lamp 

c)

hollow cathode lamp

d)

Nerst blower 

83.

 It is a hazardous waste characteristic which applies to wastes that have the potential to contaminate groundwater if improperly disposed of. These materials are regulated as hazardous waste due to their potential to leach out specific toxic substances in a landfill.

a)

Reactivity

b)

Toxicity

c)

Corrosivity

d)

Ognitability

84.

In handling acid wastes, what type of protective gloves should be used? 

a)

Rubber Gloves

b)

Disposal Gloves

c)

Cloth Gloves

d)

All of the choices

85.

According to Revised DAO 04-36, the appropriate waste labels shall include 

a)

all of the choices

b)

Volume Waste

c)

Generator ID number

d)

Container MAterial

86.

he following acids and acid mixtures can be collected and placed in glass containers EXCEPT for

a)

Sulfuric Acid

b)

Aqua Regia

c)

Hydrofluoric Acid

d)

Hydrochloric Acid

87.

When working with concentrated acids except hydrofluoric acid, which of the following statements are TRUE?

1. Acid-resistant gloves covering the whole arm or Nitrile gloves should be worn. 

II. Half- or full-faced masks with gas- and/or vaporremoving respirators should be worn. 

III. Wearing safety boots or foot covering is optional as long as the person is working under the hood. IV. Wearing of apron is optional as long as laboratory gown is worn. 


a)

I and II only

b)

all of the choices

c)

II and III only

d)

I and IV only

88.

The fire triangle consists of which of the following?

a)

Oxygen, Heat, Material

b)

Air, Fuel, Spark

c)

Air, Heat, Fire 

d)

Oxygen, Heat, Fuel

89.

In order to properly maintain chemical laboratory equipment one should perform the following EXCEPT

a)

place the equipment in hot humid location

b)

regular calibration of equipment

c)

regular inspection of operational components

d)

thorough cleaning with the proper materials

90.

Which is TRUE about laboratory fume hoods? 


a)

all of the choices 

b)

Provides further protection by diluting low concentration of flammable gases below explosion limits.

c)

It protect you from being exposed in chemical fume. 

d)

Must always be on. 

91.

What is the type of chemical that can cause an allergic reaction in the airways following inhalation of the chemical ?

a)

Corrosive

b)

Oxidizer

c)

Respiratory Sensitizer

d)

Carcinogen

92.

Which of the following may be disposed in the sink?

a)

0.1 M H2SO4

b)

none of the choices

c)

1 g/ml PC14

d)

200g/ml PC14

93.

Ammonia solution can be stored with the following chemicals EXCEPT for 

a)

cyclohexane solution 

b)

2-propanol solution 

c)

acetic acid solution 

d)

sodium hydroxide solution

94.

Which of the following can cause ERRORS during the sample preparation stage?

I.Loss of sample during weighing or dissolution 

II.Contamination by impurities in reagents and in the environment 

III.Changes in mass due to varying humidity and temperature 

IV.Obtaining inhomogeneous sample from the bulk 


a)

I and II only

b)

I, II, III

c)

I, III, IV

d)

I, II, III, IV

95.

What will you perform to know that the Atomic absorption spectrometer continues to work properly? 


a)

Calibration check 

b)

QC sample recoveries 

c)

Blank

d)

sTANDARD aDDITION

96.

Consider that you are working with Vitamin C tablet production, to which standard/s should your quality management should subscribe?

a)

GMP

b)

HACCP

c)

ISO 9001:2008

d)

ALL OF THE CHOICES

97.

The test that decides whether a datum from a given set could be rejected or NOT is

a)

T TEST

b)

Q TEST

c)

Z TEST

d)

F TEST

98.

Saying that the concentration of Total cyanide (CN) in drinking water is 0.05 mg/L, which is below the maximum allowable level of 0.07 mg/L as per DOH DAO No. 20070012 when it is actually 


a)

ACCURATE

b)

PRECISE

c)

FALSE NEGATIVE

d)

FALSE POSITIVE

99.

As per Lewis concept, what is base

a)

accepts the electron

b)

donates electron

c)

proton accepts

d)

donates protons

100.

As per Lewis Concept, acid

a)

donates electron

b)

accept electron

c)

proton accepts

d)

proton donates

101.

largest volume, lowest

(a)  

102.

oxidation state means, loss of (a)  

103.

Widely used known in Anal Chemistry, standardizing permanganate solution using sodium oxalate

(a)  

104.

SOLVENT EXTRACTION (TWO IMMISCIBLE PHASES)

a)

LIQUID LIQUID EXTRACTION

b)

SUBLIMATION

c)

DISTILLATION

d)

CRYSTALLIZATION

105.

340 TO 1000 nm (continuous spectrum light

(a)  

106.

190 - 400 nm (high density)

(a)  

107.

190 to 1000 nm

(a)  

108.

minimum concentration of a substance with 99% confidence

(a)  

109.

lowest concentration amount of substance

(a)  

110.

control chart/ potential problems

(a)  

111.

Statistical theshold, a process of parameter

(a)  

112.

testing water samples for pollution

analyze metal ions and organic compounds

a)

Liquid Chromatography

b)

Gas Chromatography

c)

Thin Layer Chromatography

d)

pAPER cHROMATOGRAPHY

113.

Detecting bombs, in airports, drugs, alcohols

used to analyze volatile gases

a)

Liquid Chromatography

b)

Gas Chromatography

c)

Thin Layer Chromatography

d)

Paper Chromatography

114.

pesticides, insecticides

absorbent of material in flat glass

rapid method to check purity

a)

Gas Chromatography

b)

Thin Layer Chromatography

c)

Paper Chromatography

d)

Liquid Chromatography

115.

Separating amino acids and anions RNA, fingerprinting anti biotics

most common type/stationary phase

pull the solutes up through the paper

a)

Paper Chromatographty

b)

Thin Layer Chromatography

c)

Liquid Chromatography

d)

Gas Chromatography

116.

Activities connected with the collection and disposal of waste

(a)  

117.

For redox titrations

(a)  

118.

Its differentiate between water soluble, carbohydrate, and ketone

(a)  

119.

for the presence of carbohydrates

a)

Molish Reagent

b)

Tollens Reagent

c)

Starch Solution

d)

Millons Reagents

120.

Silver mirror test

a)

Iodine Reagent

b)

Tollens Reagent

c)

Grignard Reagents

d)

Starch Solution

121.

acid base titrations

a)

Phenophthalein Solution

b)

Starch Solution

c)

Soluble Solution

d)

Millons Solutions

122.

Iodine Test

a)

Iodine Reagents

b)

Fehling Solution

c)

Tollens Reagents

d)

Starch Solution

123.

Soluble proteins

a)

Millons Reagents

b)

Starch Solution

c)

Grignard Solution

d)

Molish Reagents

124.

Alkyl and Alkenyl Halides

a)

Fehling Solution

b)

Starch Solution

c)

Tollens Solution

d)

Grignard Reagents

125.

Measure the amount of light absorbed by a sample, concentrations of solutes in a solution.

(a)  

126.

Maybe solid or liquid cant be gas

a)

Stationary Phase

b)

Mobile Phase

127.

maybe liquid or gas cant be solid

a)

Mobile Phase

b)

Stationary Phase

128.

Aims to achieve and maintain clean air that meets the National Air Quality

(a)  

129.

Aims to protect water bodies from pollution

a)

RA 8749

b)

RA 9249

c)

RA 9275

d)

RA 6969

130.

Aims to regulate restrict or prohibit the importation manufacture processing and sale distribution use of disposal of chemical substance and mixtures and present

a)

RA 6969

b)

RA 8249

c)

RA 9275

d)

RA 8749

131.

Enacted and implemented in June 6, 1977 (Philippine Environment Code)

a)

PD 1152

b)

PD 1586

c)

PD1189

d)

PD1159

132.

to facilitate the attainment and maintenance of rational and orderly balance between socio economic, establish of EIA (Environmental Impact Assessment)

a)

PD 1152

b)

PD 1586

c)

PD 1578

d)

PD 1670

133.

Aim to adopt a systematic, comprehensive and ecological waste solid management program, proper segregation and disposal (Ecological Solid Waste Management Act of 2000)

a)

RA 9003

b)

RA 9512

c)

RA 6979

d)

RA 6969

134.

Provides for the promotion of environmental awareness through environmental education which shall encompass (Environmental Awareness and Education Act 2008)

a)

RA9215

b)

RA 6969

c)

RA 9003

d)

RA 8742

135.

Benzene and its derivatives undergo substitution reactions instead of addition reactions because

a)

the integrity of the benzene ring and the stable pi-bonding pattern remains intact

b)

the hydrogens of benzene are relatively loosely bound

c)

the benzene ring is sterically crowded hence only substitution can occur

d)

the benzene ring is electron rich

136.

Electrophiles are

a)

electron deficient species

b)

electron rich species

c)

electrically neutral species

d)

positively charged ion

137.

SN2 means

a)

two step nucleophilic substitution mechanism involving both alkyl halide and nucleophile

b)

one step nucleophilic substitution mechanism involving both alkyl halide and nucleophile

c)

two step nucleophilic substitution mechanism involving only the alkyl halide

d)

one step nucleophilic substitution mechanism involving only the nucleophile

138.

In the decomposition and dissolution of solids during sample preparation, which of the followingis expensive and often the last resort?

a)

Acid treatment using oxidation

b)

Fusion technique

c)

dissolution using ultrasound & appropriate solvent

d)

Simple dissolution

139.

It is important to discard containers that are scratched or abraded on their interior surfaces. The internal surface area of a container, whether used for sample preparation or storage, may cause loss of

a)

matrix

b)

analyte

c)

weight

d)

ash

140.

Glass container is not suitable for

a)

inorganic trace analyses

b)

oil and grease determination

c)

microbiological analyses

d)

all of the above

141.

Which of the following is a primary standard for use in standardizing bases?

a)

Ammonium hydroxide

b)

Sulfuric acid

c)

Acetic acid

d)

Potassium hydrogen phthalate

142.

A solution has been prepared by transferring 60 mL from Ortho-phosphoric acid 85 % (v/v) H3PO4 and diluting it to 1.0 L, what is the concentration of the new solution.

a)

10.10%

b)

9.25%

c)

12.2%

d)

5.10%

143.

A student has got three stock standard solutions of 3 different elements, zinc (Zn) 2000 ppm,

cadmium (Cd) 1500 ppm and lead (Pb) 1000 ppm. A student took 10 mL from each solution and

transfers it to 200 mL volumetric flask then completed to total volume with solvent. What is the

final concentration of each element in the diluted mix solution?

a)

50 ppm Zinc, 32 ppm Cd, 25 ppm Pb

b)

100 ppm Zinc, 75 ppm Cd, 50 ppm Pb

c)

75 ppm Zinc, 75 ppm Cd, 50 ppm Pb

d)

100 ppm Zinc, 25 ppm Cd, 25 ppm Pb

144.

The HPLC column type in which molecules are separated according to size.

a)

Ion exchange

b)

size exclusion

c)

normal phase

d)

reverse phase

145.

During ignition for ashing, muffle furnaces that go up to 1100oC are used primarily for this and________ is needed to contain the sample.

a)

porcelain crucible

b)

evaporating dish

c)

beaker

d)

all of the above

146.

A graphical representation of measuring signal as a function of quantity of analyte.

a)

Calibration curve

b)

Quality Control Chart

c)

Absorbance Chart

d)

None of the above

147.

In AAS method, If the sample concentration is too high to permit accurate analysis in linearity response range, there are alternatives that may help bring the absorbance into the optimum working range.

a)

sample dilution

b)

using an alternative wavelength having a lower absorptivity

c)

reducing the path length by rotating the burner hand

d)

All of the above

148.

A student has to measure out 9.40 mL of a liquid and selects a 100 mL graduated cylinder. To improve the accuracy of the measurement, it would be most effective to:

a)

take the average of multiple measurements using the graduated cylinder.

b)

measure the liquid using a 25 mL graduated cylinder instead.

c)

estimate the measurement obtained from the graduated cylinder to an additional significant figure.

d)

measure the liquid using a 10 mL graduated pipette instead.

149.

A buffer solution may be a mixture of

a)

a weak acid and its salt

b)

a weak base and its salt

c)

an excess of a weak acid with a strong base

d)

all of the above

150.

Which statement is true?

a)

The value of the equilibrium constant increases with the addition of a catalyst

b)

A catalyst speeds up both the forward and reverse reaction rates

c)

The greater the activation energy, the faster the rate of reaction.

d)

A catalyst increases the rate of reaction by decreasing the number of collisions

151.

What volume is occupied by 4.00 g of carbon dioxide, CO2 (44.0) gas at a pressure of 0.976 atm and a temperature of 25.00C?

a)

0.191 L

b)

19.1 L

c)

2.28 L

d)

22.8 L

152.

Molecular oxygen is highly soluble in the blood because

a)

the hemoglobin molecule can bind up to four oxygen molecules

b)

the solubility of oxygen is increased by the higher temperature of the body

c)

pressure is increased inside the body

d)

pressure inside the body is different outside of it

153.

When water is heated in a beaker, bubbles of air form on the side of the glass before the water boils. This shows that

a)

the solubility of gases in water decreases with increasing temperature

b)

the solubility of gases in water increases with increasing temperature

c)

the solubility of gases in water decreases with decreasing temperature

d)

the solubility of gases in water increases with decreasing temperature

154.

The absorbance of different concentrations of potassium permanganate determined through UV- Vis Spectrophotometer is shown below.

The Quality Control Sample for this run gave an average absorbance reading of 0.486. The

theoretical concentration of the QC sample is 44.4 ppm. Calculate for the error of this QC run.

a)

0.0524

b)

0.0552

c)

0.0465

d)

0.00052

155.

Method of passing the sample through a metal or plastic mesh of a uniform cross-sectional area to separate particles into uniform sizes.

a)

sieving

b)

pulverizing

c)

macerating

d)

milling

156.

In handling acid wastes, what type of protective gloves should be used?

a)

Cloth gloves

b)

Surgical gloves

c)

Rubber gloves

d)

Disposal plastic gloves

157.

What type of container must be used for acid or alkali wastes?

a)

Polyethylene Drums

b)

Metal drums

c)

Fiber Drums

d)

Cloth container

158.

A solid waste management practice which refers to the controlled decomposition of organic matter by microorganisms, mainly bacteria and fungi, into a humus-like product.

a)

Composting

b)

Recycling

c)

Bioremediation

d)

Reducing

159.

A series of reference standards solutions that have known and accurate pH values at different temperatures used for pH meter calibration.

a)

Buffer Solutions

b)

QC Solutions

c)

pH solutions

d)

None of the above.

160.

Law that states the linear relationship between absorbance and concentration of an absorbing species

a)

Beer-Lambert’s Law

b)

Charles Law

c)

Boyles Law

d)

Avogadro’s Law

161.

Type of quality-control sample used to evaluate the effects of sample matrices on the

performance of an analytical method

a)

Matrix Duplicate

b)

Matrix Spike

c)

Method Blank

d)

Reagent Blank

162.

Component of error which, in the course of a number of analyses of the same measurand, remains constant or varies in a predictable way.

a)

Random Error

b)

Analyst’s Error

c)

Systematic Error

d)

Uncertainty

163.

It is a pure dry solid substance of known chemical composition used in the direct standardization of solution.

a)

primary standard

b)

secondary standard

c)

analytical standard

d)

indicator

164.

It is the closeness of the agreement between the result of a measured value and a true value.

a)

Accuracy

b)

Precision

c)

Mean

d)

Error

165.

Sample preparation technique used prior to instrumental analysis of metals.

a)

acid digestion

b)

liquid-liquid extraction

c)

sieving

d)

clean-up

166.

Which of the following chemicals may be used to neutralize waste containing caustic soda?

a)

Potassium Hydroxide

b)

Ammonia

c)

Hydrochloric Acid

d)

Buffer 10 Solution

167.

Which of the following are possible routes of exposure of the hazardous effect of waste?

a)

Inhalation

b)

Dermal

c)

Ingestion

d)

all of the above

168.

According to Revised DAO 04-36, the appropriate waste labels shall include:

a)

Volume of Waste

b)

Generator ID Number

c)

Container Material

d)

All of the above

169.

Sampling type that eliminates questions of bias in selection

a)

composite

b)

stratified

c)

systematic

d)

random

170.

Reliability of the results decreases with a decrease in the level or concentration of the:

a)

matrix

b)

analyte

c)

reactant

d)

product

171.

Properties of nitric acid making it the preferred acid for digesting samples for the analysis of metals.

a)

acts as a strong acid

b)

as an oxidizing agent

c)

does not form insoluble compounds with metals/nonmetals

d)

All of the above

172.

Locating the adulterated portion of the lot for sampling is an example of

a)

random sampling

b)

selective sampling

c)

composite sampling

d)

stratified sampling

173.

Quantitative chemical analysis of weighing a sample, usually of a separated and dried precipitate.

a)

Titrimetric analysis

b)

Volumetric analysis

c)

Gravimetric analysis

d)

Elemental analysis

174.

The substance which does the dissolving and must be greater than 50% of the solution.

a)

solvent

b)

solute

c)

mixture

d)

solution

175.

Used for vacuum filtration using filter paper.

a)

gooch crucible

b)

Buchner funnel

c)

rotary evaporator

d)

rubber aspirator

176.

In chromatography, ________ is carried out on glass plates or strips of plastic or metal coated on one side with a thin layer of adsorbent.

a)

HPLC

b)

GC

c)

Paper Chromatography

d)

Thin Layer Chromatography

177.

Chromatography is used to

a)

Separate two or more compounds based on their polarities.

b)

Separate two or more compounds based on their masses.

c)

Separate two or more compounds based on how strongly they interact with other compounds

d)

all of the above

178.

A technique for separating mixtures into their components in order to analyze, identify, purify, and/or quantify the mixture or components.

a)

Spectroscopy

b)

Chromatography

c)

Gravimetry

d)

Titrimetry

179.

A graph showing the detectors response as a function of elution time : band’s shapes, position, resolution

a)

monitor display

b)

quality control chart

c)

calibration curve

d)

chromatogram

180.

Under the Bronsted concept of acids and bases, a base is

a)

a proton donor

b)

a proton acceptor

c)

a hydroxide donor

d)

an electron pair donor

181.

Which of the following is not a common method used for purification?

a)

Sublimation

b)

Crystallisation

c)

Electrolysis

d)

Chromatography

182.

The solution of impure compound and solvent is concentrated to get ____________

a)

Unsaturated solution

b)

Undersaturated solution

c)

Saturated solution

d)

Oversaturated solution

183.

Insoluble impurities from solution during crystallization are removed by ____________

a)

Drying

b)

Filtration

c)

Heating

d)

Cooling

184.

Crystal phases can be interconverted by varying ____________

a)

Temperature

b)

Pressure

c)

Size

d)

Viscosity

185.

Which of the following is not separated through distillation process?

a)

Acetone and water

b)

Aniline and chloroform

c)

Impurities in seawater

d)

Milk and water

186.

Column chromatography is based on the principle of _______________ (this question appeared twice)

a)

Ion-exchange

b)

Exclusion principle

c)

Differential Adsorption

d)

Absorption

187.

Select the correct statement from the following options.

a)

The lesser the polarity of solute, more strongly it will be adsorbed on a polar surface

b)

The greater the polarity of solute, more weakly it will be adsorbed on a polar surface

c)

The greater the polarity of solute, more strongly it will be adsorbed on a polar surface

d)

All of the mentioned option

188.

The elution power of a solvent is determined by ____________

a)

Its overall polarity

b)

The polarity of the stationary phase

c)

The nature of the sample components

d)

All of the mentioned

189.

The principle on which thin layer chromatography is based is that the ____________

a)

Different compounds are absorbed on an absorbent to different degrees

b)

Different compounds are absorbed on an absorbent to same degrees

c)

Different compounds are adsorbed on an adsorbent to different degrees

d)

Different compounds are absorbed on an absorbent to same degrees

190.

Which type of chromatography is used for the structural analysis?

a)

Column chromatography

b)

Paper chromatography

c)

Partition chromatography

d)

Affinity chromatography

191.

Affinity chromatography is used for the analysis and isolation of ____________

a)

Insoluble starch substances

b)

Enzyme tyrosinase

c)

Antibodies bound with a covalently-attached antigen on cellulose column

d)

All of the mentioned

192.

Which of the following is not an application of high performance liquid chromatography?

a)

Analysis of proteins, drugs and explosives

b)

Separation of pharmaceutical drugs

c)

Elimination of undesirable substances from blood

d)

Separation of lipids, fatty acids and steroids

193.

Which of the following is the application of ion exchange chromatography?

a)

Ion exchange chromatography

b)

Thin layer chromatography

c)

Gas chromatography

d)

Liquid chromatography

194.

The temperature at which solid and liquid coexist in equilibrium is called ____________

a)

Melting point of liquid

b)

Freezing point of liquid

c)

Freezing point of solid

d)

All of the mentioned

195.

The analysis of electromagnetic radiation scattered, absorbed or emitted by the molecule is called

a)

Kaleidoscopy

b)

Astronomy

c)

Spectroscopy

d)

Anatomy

196.

Select the correct statement from the following option.

a)

Spectroscopic methods require less time and more amount of sample than classical methods

b)

Spectroscopic methods require more time and more amount of sample than classical methods

c)

Spectroscopic methods require less time and less amount of sample than classical methods

d)

Spectroscopic methods require more time and less amount of sample than classical methods

197.

Which of the following is not in the infrared spectrum?

a)

HCl

b)

H2O

c)

CO2

d)

CH4

198.

The components of the mixture in column chromatography are eluted in order of

a)

increasing polarity and increasing distribution ratio.

b)

increasing polarity and decreasing distribution ratio.

c)

decreasing polarity and increasing distribution ratio.

d)

decreasing polarity and decreasing distribution ratio.

199.

An industrial source of alcohol.

a)

Coal

b)

Fats

c)

Sugar

d)

Ether

200.

A 22/24 stopper is used in a volumetric flask. Which of the following is true? (Same concept as

this).

a)

The diameter is 24 cm and the height is 22 cm.

b)

The diameter is 22 cm and the height is 24 cm.

c)

The diameter is 24 mm and the height is 22 mm.

d)

The diameter is 22 mm and the height is 24 mm.

201.

This type of glass is commonly used for laboratory glassware.

a)

Amber

b)

Quartz

c)

Fused silica

d)

Borosilicate

202.

In the analysis of a mixture by gas chromatography, which of the following gives the best clue as to whether the components can be analyzed with any degree of accuracy? (Same concept)

a)

Column length

b)

Retention times

c)

Column temperature

d)

Flow rate of the carrier gas

203.

Why is there a need to separate halogenated waste from non-halogenated waste?

a)

Halogenated waste disposal is more costly.

b)

Non-halogenated wastes are more toxic.

c)

They are not compatible.

d)

They will react.

204.

In an ideal gas of volume V and temp T. What happens to T when volume is doubled under constant P?

a)

Increases

b)

Decreases

c)

Remains Constant

d)

Doubled

205.

Water is a good solvent for benzoic acid recrystallization.what is the correct preparation of benzoic solution for recrystallization.

a)

Add benzoic acid to minimum hot water with stirring

b)

Add room temp water to benzoic while stirring until dissolved

c)

Add maximum hot water to benzoic acid while stirring

d)

Add small.portions of hot water to benzoic acid while stirring. Until dissolve

206.

The gas-solid chromatography is ____________ chromatography as per basic principle involved

a)

Exclusion

b)

Ion exchange

c)

Adsorption

d)

Absorption

207.

A compound is known to decompose at its boiling point, which of the following methods can be used to purify this substance

a)

Simple distillation

b)

vacuum distillation

c)

liquid-liquid extraction

d)

steam distillation

208.

A solution is _______ if more solute can dissolve in it.

a)

saturated

b)

supersaturated

c)

unsaturated

d)

concentrated

209.

Organic peroxides are dangerous when

a)

Heated

b)

Concentrated

c)

Let ether, p-dioxane, THF, among others to vaporize

d)

All of the above

210.

This quality system standard is a general requirement for the competence of testing and

calibration laboratories.

a)

GLP

b)

GMP

c)

ISO 9000

d)

ISO/IEC 17025:2005

Similar Resources on Wayground

embryo midterm

212 questions

embryo midterm

quiz

Worksheet

•

University