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WorksheetsEnvironmental Chemistry Pre-Test
Total questions: 51
Worksheet time: 36mins
What is the purpose of the section labelled 'X' in the apparatus?
Draw in liquid into the pipette
release air from the pipette
release liquid from the pipette
draw air into the pipette
The tool used to measure absorbance is
turbidimeter
Spectrophotometer
pH meter
Absorbance Meter
Things that shouldn't be done inside the laboratory
doing the practicum
eat or drink
using laboratory apparatus as needed
using chemicals according to the guideline and as needed
The meaning of this symbol is
easily oxidized
flammable
Radioactive
Explosive
Below are the lab's health and safety regulation, excluding
Using the appropriate lab coat
not using any socks
using a mask
using gloves
The function of the apparatus shown are
to heat samples in a high temperature; to help in mixing samples; solution container during titration; to help drying samples; to filter solids from a solution
solution container during titration; to heat samples in a high temperature; to filter out solids from the solution; to help drying of samples; to help with mixing samples
solution container during titration; to heat samples in a high temperature; to help drying of samples; to filter out solid from solution; to help with mixing solutions
to heat samples in high temperature; to filter solids from the solution; solution container during titration; to help with mixing of sample; to help drying samples
The principle used in Iodometry is the oxidation-reduction reaction of iodine (I2) to (I-) that is reversible. TRUE or FALSE
True
False
What indicators are used in in Iodometry analysis?
Methyl Blue
PP
Bromothymol Blue
Phenol Red
Complete the stoichiometric reaction of a strong acid with iodine and iodide
5I- + ..... + 6H+ --> ..... + 3H2O
(a)
To determine the end point of titration, you need to wait until colour change is permanent. TRUE or FALSE
True
False
What is the oxidising agent used used in Iodometry titration analysis?
Oxalic Acid
KMnO4
Sulfuric Acid
Hydrogen Peroxide
A solution was tested with the PP indicator and has a pH of 6.2. What colours appear on the indicator?
Red
Purple
No color
Blue
The point at which the titrant is added appropriately reacts with all the substance being titrated without any remaining titrant is called ..
Equivalence point
Titration end point
Reactants turning point
BPC point
Below, the conditions for the solution are said to be the primary standard solution, except ...
The substance is easy to obtain, easy to purify, easy to dry (at 110-120 ° C) and stable
Substances do not change due to air contact during weighing
The substance has a low equivalent (low BM) so that the weighing deviation is large
Substance easily dissolved completely
One of the requirements for proper titrimetric analysis is: the equivalence point just show changes chemically, to make it easier to use indicators, true or false?
True
False
In the acid-base titration experiment, two indicators was used because the pH range to be tested was large while the pH range that could be indicated by each indicator was limited, true or false?
True
False
(1) The equivalence point will be obtained when the amount of acid is equivalent to the number of bases in the reaction to form salt.
(2) The pH value at the equivalence point is 7.
(3) The salt obtained is neutral
(4) The equivalence point is indicated by the indicator which changes at the pH of the appropriate salt.
The correct statement regarding the reaction of a strong acid with a weak base or a weak acid with a strong base is
1 and 2
1
3 and 4
4
V Ba(OH)2= 25 mL
V HCl = 100 mL
M HCl = 0,1 M
The concentration of Ba (OH) 2 needed is ..
0.05 M
0.1 M
1 M
0.01 M
Absorption is the absorption by all phases of the absorbent substance, whereas Adsorption is the absorption only by the surface of the absorbent substance, True or False?
True
False
With the same solution concentration, the more activated carbon is put into the solution, then
(1) The clearer the solution after stirring
(2) The solution becomes cloudier after stirring
(3) The greater the absorbance value of the filtrate
(4) The smaller the absorbance value of the filtrate
1,3
1,4
2,3
2,4
How to determine the isotherm model of the adsorption mechanism and the adsorption capacity of an adsorbent that is specific to the adsorbate?
Determine the adsorbate weight per adsorbent weight
Determine the weight of adsorbate per weight of adsorbent and the concentration of waste at equilibrium
Determine the adsorbent weight per adsorbate weight
Determine the weight of adsorbent per weight of adsorbate and the concentration of waste at equilibrium
Why should the correlation value be close to 1 in the adsorption isotherm graph? Except
The R value closest to 1 indicates the adsorption isotherm corresponding to your experiment
the R value that is closest to 1 indicates good experimental results
The R value which is closest to 1 shows the largest absorbance value of the filtrate
The R value which is closest to 1 indicates a low error rate
This graph shows the equation..
Linear Isotherm
Langmuir isotherm
Freundlich isotherm
runauer-Emmett-Teller (BET) isotherm
What is not a step in carrying out a gravimetric analysis
Precipitation
Washing
Filtering
Dissolving
The process of separating the analyte must be complete is one of the conditions for the gravimetric analysis to run well, True or False?
True
False
The ratio of the weight of the analyte to the weight of the preparation analysis calculated in percent (%) is called..
(a)
One of the uses of gravimetric analysis in environmental engineering is to determine the TSS value contained in drinking water, is it true or not?
True
False
In Calcium determination with Oxalate solution experiment, after being put in the furnace for 30 minutes, why does it need to be put in the oven before putting it in a desiccator?
(a)
To obtain pure precipitated crystals what should be done?
washing with a lot of solvent
washing with a little solvent
washing with the same amount of solute
solute deposition
What indicator are used in Chemical Reaction Kinetics experiment?
(a)
Rate of reaction is defined as the speed at which reactants are converted into products. Order of reaction represents the number of species whose concentration directly affects the rate of reaction. True or false?
True
False
The purpose of adding H2SO4 in Chemical Reaction Kinetics experiment is as an....
Indicator
Catalyst
Solvent
Neutralizer
The following are the factors that affect the rate of reaction, except ….
Concentration of components in the reaction (both reactants and products)
Reaction coefficient
Catalyst
Temperature
The correlation between A and C (coefficient of molar absorptivity and cuvet width, are known as constant, K) will be linier on exact range of concentration. The linearity of this correlation curve will determine the size of spectrophotometry analysis detectable limit (limit of detection, LoD) on a good measurement range. True or False?
True
False
An analytical apparatus that can be used for quantitative or qualitative measurement, by passing through the light (specifically generated by light source and was selected by monochromator inside the spectrophotometer) from a clear solution is ….
Spectrophotometer
pH meter
Vacuum filter
Magnetic stirrer
In order to get the right measurement results, spectrophotometer can only measure transparent colored solution. True or False?
True
False
Materials that are used in visible spectrophotometry analysis is
BaCl2
Aquadest
NaOH and HCl
KMnO4
The material that acts as a buffer solution so that the turbidity that has been formed does not easily change is …
BaCl2
HCl 2N
glycerol-alcohol
K2SO4
The working principle of a turbidimeter is that the incoming light on a particle is then absorbed, the amount of light absorbed is used as the basis for measurement, True or False?
True
False
There are four basic mechanisms of light when passed to a suspension solution which is the basis for turbidimetric and naphelometric analysis, except …
Absorption
Adsorption
Reflects
Refracts
Turbidity analysis unit using turbidimeter is ….
ppm
NTU/FTU
mL
mg/L
1. Scattered with absorption
2. Reflected
3. Refracted
4. Transmitted
Which are the basic mechanisms of light when passed to a suspension solution which is the basis for turbidimetric and naphelometric analysis?
1 and 2
2 and 4
1 and 3
All true
The suspension formed from the reaction between K2SO4 and BaCl2 is …
SO4 (2-)
Ba (2+)
BaSO4
KCl
On some circumstance, turbidity can be measured using UV-vis spectrophotometer. However, repetitive procedures have to be performed to ensure its accuracy and stability. True or False?
True
False
What is the function of a blanko in Spectrophotometry analysis?
(a)
What is Maximum Wavelength?
(a)
Which is the correct reaction rate equation: Zero-Order, First-Order, and Second-Order!
Zero-Order --> v = k[X]^0 = k
First-Order --> v = k[x]^t = k[X]
Second-Order --> v = k[X]^2 = k[X]^2
Zero-Order --> v = k[x]^t = k[X]
First-Order --> v = k[X]^0 = k
Second-Order --> v = k[X]^2 = k[X]^2
Zero-Order --> v = k[X]^0 = k
First-Order --> v = k[X]^2 = k[X]^2
Second-Order --> v = k[x]^t = k[X]
What is the meaning of Recovery Factor?
(a)
Mention the application of adsorption in environmental engineering (minimum 2)
Mention the application of adsorption in environmental engineering (minimum 2)
(a)
\What is the definition of Maximum Wavelength?
(a)
