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WorksheetsChemical Technician Review Session
Total questions: 55
Worksheet time: 28mins
What is the function of pH meters and ion analyzers?
To measure temperature
To analyze acidity and ion concentration
To determine chemical composition
To detect radioactivity
What are isotopes?
same elements with different charges
same elements with different atomic mass
same number of neutrons with different atomic mass
same number of protons with different atomic number
How many possible stereoisomers does Baulamycin have? (7 stereocentres)
7
14
49
128
How can you prove if a novel enantiopure compound has R or S configuration?
Derivatising (e.g. Mosher's ester) then 1H NMR
Measuring [α]D
Chiral HPLC
X-ray crystallography
Which of the following alkanes would you expect to have the lowest melting point?
octane
propane
pentane
butane
Which of the following metals will react spontaneously with a solution containing iron ions?
Sn
Al
Cu
Pb
Which of the following reactions is a redox reaction?
NaOH + HCl --> NaCl + H2O
Fe + 2 HCl --> FeCl2 + H2
MgO + H2SO4 --> H2O
AgNO3 + KI --> KNO3 + AgI
When a Mg atom becomes a Mg2+ ion, the number of protons in the nucleus
increases
decreases
stays the same
What type of reaction occurs when a metal atom becomes a positive ion?
oxidation
reduction
neutralization
double replacement
In a redox reaction how doe the number of electrons lost compare to the number of electrons gained?
the number lost is sometimes equal to the number gained
the number lost is always equal to the number gained
the number lost is always greater than the number gained
the number lost is always less than the number gained
In which of the following does chlorine have an oxidation state of +1?
NaCl
NaClO2
NaClO
Cl2
Which of the following occurs if a 50-milliliter sample of a 2-molar Cd(NO3)2 solution is added to the left beaker?
Voltage increases.
Voltage decreases.
Voltage becomes zero and remains at zero.
No change in voltage occurs.
If a copper sample containing some zinc impurity is to be purified by electrolysis, the anode and the cathode must be which of the following?
Pure copper anode & pure zinc cathode
Pure zinc anode & pure copper cathode
Pure copper anode & impure copper cathode
Impure copper anode & pure copper cathode
Which of the following best describes this electrochemical cell?
Electrode A is the anode since anions are present in its half-cell and the current flows from cathode to anode.
Electrode C is the cathode since cations are present in its half-cell and the current flows from anode to cathode.
Electrode A is the anode and Electrode C is the cathode since the current always flows from cathode to anode.
Electrode C is the anode and Electrode A is the cathode since the current always flows from anode to cathode.
A redox reaction has an equilibrium constant of
K = 2.6 x 105. Which of the following statements best represents the algebraic signs of Eocell and Gorxn for this reaction?
Eocell is positive and Gorxn is positive.
Eocell is negative and Gorxn is negative.
Eocell is positive and Gorxn is negative.
Eocell is negative and Gorxn is positive.
Which of the following best represents a reaction in which the same reactant undergoes both oxidation and reduction?
S8(s) + 8 O2(g) → 8 SO2(g)
H2SeO4(aq) + 2 Cl–(aq) + 2 H+(aq) → H2SeO3(aq) + Cl2(g) + H2O(l)
3 Br2(aq) + 6 OH–(aq) → 5 Br– (aq) + BrO3 – (aq) + 3 H2O(l)
PtCl4(s) + 2 Cl– (aq) → PtCl62– (aq)
AlF6 3– + 3 e– → Al + 6 F– 1
Which of the following occurs in the reaction?
AlF63– is reduced at the cathode.
Al is oxidized at the anode.
Aluminum is converted from the –3 oxidation state to the 0 oxidation state.
Aluminum is converted from the –3 oxidation state to the 0 oxidation state.
Which part of an atom has a negative electric charge?
proton
neutron
electron
nucleus
Q. chromatography separates the mixture of dyes on the basis of their ----------------------------
solubility
boiling point
boiling point
boiling point
What lab equipment is being described below?
I am used to hold a growth medium in which cells can be cultured, originally, cells of bacteria, fungi, and small mosses.
evaporating dish
petri dish
mortar and pestle
observing slide
What is the correct pictogram of the flammable hazard?
What lab equipment is being described below?
I am used to measure out or transfer small quantities of liquid from one container to another.
Which of the following is NOT a safe lab practice?
Keep chemicals, glassware, and other equipment away from the edge of the lab table.
After removing glassware from a heat source touch it right away to see if it is cool.
Report minor accidents to your lab technician and/or teacher.
Heat chemicals in a flask without a stopper.
What is the primary goal of Quality Control?
Prevention of defects
Identification of defects
Reduction of costs
Estimating Savings
Which of these is a quality assurance approach?
Preventive Quality Control
Reduction Quality Assurance
Acceptance Quality Control
Preventive Quality Assurance
A student was not wearing his laboratory goggles when a chemical splashed on his eye as he was pouring the contents of his beaker into another container. Which of the following should be done in this scenario?
Immediately flush eye with a stream of water for at least ten minutes
Apply saturated bicarbonate solution on the eye
Apply antiseptic and bandage on the eye
Apply ointment and bandage on the eye
Which of the following should be worn when working in the laboratory?
Safety goggles, laboratory coat, and fully enclosed footwear
Safety goggles, laboratory coat, and open-toed shoes
Safety blanket, laboratory coat, and sandals
Safety goggles, laboratory coat cut above the knee, and high heels
To determine the concentration of a sample, titration using a standard base solution will be employed. Which of the following is appropriate to use?
When studying a chemical, it is important to touch, taste, and smell it so that you know a lot about it. After every experiment, wash your hands thoroughly.
Only the second statement is correct
Only the first statement is correct
Both of the statements are correct
None of the statements are correct
What laboratory apparatus is missing in the given set-up?
Glass funnel
Glass adapter
Separatory funnel
Buchner funnel
What does this pictogram represent?
Oxidizer
Flammable
Explosive
Broken Glassware
What does this pictogram represent?
Toxic
Corrosive
Carcinogen/Health Hazard
Explosive
What does this pictogram represent?
Flammable
Oxidizer
Flammable
Corrosive
What does the BLUE color on the NFPA diamond stand for?
Specific Hazard
Health Hazard
Fire Hazard
Reactivity/Instability Hazard
What does the WHITE color on the NFPA diamond stand for?
Specific Hazard
Health Hazard
Fire Hazard
Reactivity/Instability Hazard
What does the RED color on the NFPA diamond stand for?
Specific Hazard
Health Hazard
Fire Hazard
Reactivity/Instability Hazard
What is correct about this image?
Deadly
Extremely Flamable
Extremely Volatile
Reacts with water
What does the specific hazard in this NFPA diamond indicate?
Oxidizer
Do not mix with water
Radiation Hazard
Alkali
What is the purpose of the Globally Harmonized System of Classification and Labelling of Chemicals (GHS)?
To ensure labels are on incoming labels and not defaced
To provide information and training to employees
To identify shipments of hazardous materials
To harmonize hazard classification criteria and chemical hazard communication elements worldwide
What is the purpose of the Hazardous Materials Identification System (HMIS)?
To provide a simple, readily recognized, easily understood system to help employees understand hazards
To ensure labels are on incoming labels and not defaced
To identify shipments of hazardous materials
To maintain SDSs from shipments
What is the purpose of the Safety Data Sheet (SDS)?
To provide a simple, readily recognized, easily understood system to help employees understand hazards
To ensure labels are on incoming labels and not defaced
To identify shipments of hazardous materials
To provide detailed information about a specific hazardous substance, including its hazards and safety precautions
Which group in the periodic table is known as the noble gases?
Group VII A/Group 17
Group VIII A /Group 18
Group II A/Group 2
Group I A/Group 1
Who is credited for creating the Periodic Table of Elements?
Vladamir Putin
Ernest Rutherford
Ivan Drago
Dimitri Mendeleev
Which of the following chemicals is not included in preparing the Karl Fischer reagent?
Pyridine
Acetone
Sulfur dioxide
Iodine
To remove stain of KMnO4, the most effective chemical substance is :
Oxalic acid
Sodium thiosulfate
Vinegar
Bromine solution
Dichlorophenol-indophenol solution is standardized using:
Sulfanilamide USP
Ascorbic acid USP
Sulfathiazole USP
Resorcinol USP
The following is/ are true about EDTA titration.
I. EDTA titration is also known as complexometric titration.
II. The equilibrium constant in EDTA titration is called EDTA indicator.
III. For end-point detection, commonly used indicator is called EDTA indicator
IV. EDTA titration technique includes displacement titration.
I only
II and III
I, II, and III
I, II and IV
I, II, III and IV
The following is/are true about auxillary complexing agent.
I. Eriochrome black is an example of an auxillary complexing agent
II. Auxillary complexing agents are also ligands
III. Auxillary complexIng agents binds the metal strong enough to prevent the hydroxide from precipitating, but weakly enough to give up the metal ion when EDTA is added.
IV. It is used to permit many metals to be titrated in alkaline solution with EDTA.
I only
II and III
II, III, and IV
III, and IV
I, II, III and IV
Which of the following statement/s is/are correct
I. Iodine value is a quantitative measure of the amount of unsaturated fatty acid in fats.
II. Method I of determining iodine value is also known as Hanus method.
III. Wij’s method is also a method of determining iodine value.
IV. Hubl’s method is official method of determining iodine value.
I only
I and II
I, II and III
All of the statements are correct
What is a key difference between QA and QC?
QA is about documentation, while QC is about training
QA is focused on inspection, while QC is focused on planning
QA identify the defect whereas QC prevent the defect.
QA provides confidence that quality requirements will be fulfilled, while QC fulfills quality requirements
Which of the following can cause variation in measurements?
Consistent methodology
Measurement error
Identical equipment
Uniform conditions
This piece of laboratory equipment is used in distillation procedures. What is the name of this glassware?
condenser
ceramic square
thermometer
test tube holder
