CHEM 116 LAB EXAM QUESTIONS WITH ANSWERS
2025/2026
Which of the following statements best describes the line you will create on the bottom
of your TLC plate? - It should be made in pencil about a centimeter from the bottom of
the plate.
Which of the following answers lists the components for the microcolumn in the order
you should add them. - glass wool, sand, silica gel, solvent and dye, sand
Which statement BEST describes the relationship between the spots that are developed
on the TLC plate and the spots that are separated by the microcolumn? - The spots will
appear in opposite order (ex: blue,pink and pink, blue) on the TLC plate and the
microcolumn because we add solvent from the top in one and the bottom in the other.
Which of the following statements best describes the proper disposal of the
microcolumn? - In the glass waste, without paper towels.
Which of the following statements regarding the use of the Buchner funnel is
INCORRECT? - You are limited to only the amounts of 'wash' solvents that are listed in
the manual.
What should you do if you measure 55.3 mL (59.4 g) of milk? - Record the mass and
press on because you care more about exact mass than exact volume here.
Which of the following statements regarding heating the acetone mixture in exercise 2 is
incorrect? - The beaker should be cool enough that you can remove it from the hot plate
with your bare hands.
What color should be observed when a small drop of basic solution is touched to litmus
paper - blue
Which of the following statements regarding the Benedict's Test for Reducing Sugars is
INCORRECT - This test will give a positive result for any sugar.
How many moles of phosphate were isolated from a sample of milk if 1.399-g of calcium
phosphate were isolated after the completion of exercise 3?
Report your answer to 4 decimal places and WITHOUT units. - .009
A denatured protein will be more soluble in water than a protein in it's native, folded
state. - false
A fat molecule will likely be more soluble in heptane (an organic solvent) then in
aqueous solution. - True
, Excess of which of the following reagents should be placed in the designated chemical
waste containers? - Acetone
According to your lab manual, which of the following experimental steps MUST be
carried out in the fume hood because of the risk of bumping.? - Heating the precipitate
from Exercise 1 in acetone.
AgNO3(s) →
Ag(s) +
NO2(g) +
O2(g) - 2,2,2,1
he following reaction can BEST be described by which of the following categories?
BaCl2(aq) + H2SO4(aq) → BaSO4(s) + 2HCl(aq) - precipitation
The following reaction can BEST be described by which of the categories listed below?
- gas
Which of the following statements regarding the collection and use of pH data during
this week's lab is FALSE? - pH data should be collected following completion of all of
the reactions.
Two clear/colorless solutions are mixed quantitatively. No noticeable precipitate or gas
is observed, and the reaction is performed on a small scale (in a well plate). The lab
group should record "no reaction" in their notebook. - false, note NVC
You will prepare solutions this week using a volumetric flask. What should you do if you
add water too quickly and your solution goes above the graduation line? - Start
weighing another sample of copper sulfate because you need to start over.
A lab group made a copper amine stock solution with a concentration of 0.021 M. A
group member transfers 8.83 mL of this solution to a 25 mL volumetric flask and dilutes
to the line with water. What is the concentration of the resulting solution?
Report your answer to 3 decimal places. - .007
What mass of copper sulfate pentahydrate is necessary to produce 25 mL of a solution
with a concentration of 0.021 moles per liter?
Report your answer to 3 decimal places. - .131
2025/2026
Which of the following statements best describes the line you will create on the bottom
of your TLC plate? - It should be made in pencil about a centimeter from the bottom of
the plate.
Which of the following answers lists the components for the microcolumn in the order
you should add them. - glass wool, sand, silica gel, solvent and dye, sand
Which statement BEST describes the relationship between the spots that are developed
on the TLC plate and the spots that are separated by the microcolumn? - The spots will
appear in opposite order (ex: blue,pink and pink, blue) on the TLC plate and the
microcolumn because we add solvent from the top in one and the bottom in the other.
Which of the following statements best describes the proper disposal of the
microcolumn? - In the glass waste, without paper towels.
Which of the following statements regarding the use of the Buchner funnel is
INCORRECT? - You are limited to only the amounts of 'wash' solvents that are listed in
the manual.
What should you do if you measure 55.3 mL (59.4 g) of milk? - Record the mass and
press on because you care more about exact mass than exact volume here.
Which of the following statements regarding heating the acetone mixture in exercise 2 is
incorrect? - The beaker should be cool enough that you can remove it from the hot plate
with your bare hands.
What color should be observed when a small drop of basic solution is touched to litmus
paper - blue
Which of the following statements regarding the Benedict's Test for Reducing Sugars is
INCORRECT - This test will give a positive result for any sugar.
How many moles of phosphate were isolated from a sample of milk if 1.399-g of calcium
phosphate were isolated after the completion of exercise 3?
Report your answer to 4 decimal places and WITHOUT units. - .009
A denatured protein will be more soluble in water than a protein in it's native, folded
state. - false
A fat molecule will likely be more soluble in heptane (an organic solvent) then in
aqueous solution. - True
, Excess of which of the following reagents should be placed in the designated chemical
waste containers? - Acetone
According to your lab manual, which of the following experimental steps MUST be
carried out in the fume hood because of the risk of bumping.? - Heating the precipitate
from Exercise 1 in acetone.
AgNO3(s) →
Ag(s) +
NO2(g) +
O2(g) - 2,2,2,1
he following reaction can BEST be described by which of the following categories?
BaCl2(aq) + H2SO4(aq) → BaSO4(s) + 2HCl(aq) - precipitation
The following reaction can BEST be described by which of the categories listed below?
- gas
Which of the following statements regarding the collection and use of pH data during
this week's lab is FALSE? - pH data should be collected following completion of all of
the reactions.
Two clear/colorless solutions are mixed quantitatively. No noticeable precipitate or gas
is observed, and the reaction is performed on a small scale (in a well plate). The lab
group should record "no reaction" in their notebook. - false, note NVC
You will prepare solutions this week using a volumetric flask. What should you do if you
add water too quickly and your solution goes above the graduation line? - Start
weighing another sample of copper sulfate because you need to start over.
A lab group made a copper amine stock solution with a concentration of 0.021 M. A
group member transfers 8.83 mL of this solution to a 25 mL volumetric flask and dilutes
to the line with water. What is the concentration of the resulting solution?
Report your answer to 3 decimal places. - .007
What mass of copper sulfate pentahydrate is necessary to produce 25 mL of a solution
with a concentration of 0.021 moles per liter?
Report your answer to 3 decimal places. - .131
