CHEM 1212 final Exam Questions Answered Correctly Latest Update 2025-2026
Match the confirmation test with a description of the positive results.
Confirmation test for Mn2+: - Answers a purple solution
Match the confirmation test with a description of the positive results.
Confirmation test for Cr3+: - Answers a pale yellow tan solid
Match the confirmation test with a description of the positive results.
Confirmation test for Ni2+: - Answers a red pink precipitate
Match the confirmation test with a description of the positive results.
Confirmation test for Fe3+: - Answers dark blood red solution
Match the confirmation test with a description of the positive results.
Confirmation test for Zn2+: - Answers gray-white precipitate
You have one test tube which contains a solution that is either Ni+2(aq) or Cr+3(aq). Select a
reagent that will allow you to differentiate between the two chemical species. If the solution is
Ni+2(aq), what will happen when the reagent is added? If the solution is Cr+3(aq) what will
happen when the reagent is added? - Answers NaOH
If it is Ni2+, the solution will remain the same after adding the NaOH.
If it is Cr3+, a green precipitate will form after adding the NaOH.
You have one test tube which contains a solution that is either Ni+2(aq) or Fe+3(aq). Select a
reagent that will allow you to differentiate between the two chemical species. If the solution is
Ni+2(aq), what will happen when the reagent is added? If the solution is Fe+3(aq) what will
happen when the reagent is added? - Answers KSCN
If it is Ni2+, the green solution will stay the same after adding the KSCN.
If it is Fe3+, the blood red solution will form after adding the KSCN.
the liquid that was carefully poured into a new container - Answers decantate
To carfully pour a liquid into another conatiner - Answers decant
name the chemical: K2CrO4 - Answers potassium chromate
You have two test tubes. One test tube contains Ag+(aq) solution and the other test tube
contains Bi+3(aq). Predict what will happen when HCl(aq) is added to both test tubes. If a
reaction occurs, what is the new chemical formula? - Answers Ag+ will form a white precipitate,
, AgCl.
Bi3+ will remain unchanged.
You have two test tubes. One test tube contains Pb+2(aq) solution and the other test tube
contains Bi+3(aq). Predict what will happen when HCl(aq) is added to both test tubes. If a
reaction occurs, what is the new chemical formula? - Answers Pb+2(aq) will form a white
precipitate, PbCl2(s). Bi+3(aq) will remain unchanged.
You have two test tubes. One test tube contains Pb+2(aq) solution and the other test tube
contains Cu+2(aq). Predict what will happen when HCl(aq) is added to both test tubes. If a
reaction occurs, what is the new chemical formula? - Answers Pb+2(aq) will form a white
precipitate, PbCl2(s). Cu+2(aq) will remain unchanged.
Which of the chemicals are oxidants? - Answers K2CrO4
The liquid above the solid in a mixture of solid and solution - Answers supernate
A solid compound that forms as a result of mixing reagents together in a solution - Answers
precipitate
A unique chemical used in this experiment is K4Fe(CN)6(aq). What is its name? - Answers
potassium ferrocyanide
NH3(aq) and NH4OH(aq) are different ways of writing the chemical formula of the which
chemical? - Answers aqueous ammonia
Select the steps that will compose a rationale for the cation Ni+2 being absent in an unknown. -
Answers A red-pink solid did not form after the addition of H2DMG in step 3-F.
Select the step(s) that will compose a rationale for the cation Ni+2 being present in an unknown
- Answers A precipitate formed when 6 M NaOH was added to the unknown solution in step 3-A
The precipitate from step 3-A dissolved in 6 M HNO3.
A strawberry red precipitate formed in step 3-F
Separation can be achieved when a reaction occurs in a mixture. The resulting mixture will have
one chemical species in a solution and the other chemical species as a solid. The mixture is
centrifuged and the supernate is decanted into a separate test tube. Now the solid and solution
are separated from each other.
What reagent could you add to a mixture of Ag+ and Cu+2 to separate the two species? -
Answers HCl
Separation can be achieved when a reaction occurs in a mixture. The resulting mixture will have
one chemical species in a solution and the other chemical species as a solid. The mixture is
Match the confirmation test with a description of the positive results.
Confirmation test for Mn2+: - Answers a purple solution
Match the confirmation test with a description of the positive results.
Confirmation test for Cr3+: - Answers a pale yellow tan solid
Match the confirmation test with a description of the positive results.
Confirmation test for Ni2+: - Answers a red pink precipitate
Match the confirmation test with a description of the positive results.
Confirmation test for Fe3+: - Answers dark blood red solution
Match the confirmation test with a description of the positive results.
Confirmation test for Zn2+: - Answers gray-white precipitate
You have one test tube which contains a solution that is either Ni+2(aq) or Cr+3(aq). Select a
reagent that will allow you to differentiate between the two chemical species. If the solution is
Ni+2(aq), what will happen when the reagent is added? If the solution is Cr+3(aq) what will
happen when the reagent is added? - Answers NaOH
If it is Ni2+, the solution will remain the same after adding the NaOH.
If it is Cr3+, a green precipitate will form after adding the NaOH.
You have one test tube which contains a solution that is either Ni+2(aq) or Fe+3(aq). Select a
reagent that will allow you to differentiate between the two chemical species. If the solution is
Ni+2(aq), what will happen when the reagent is added? If the solution is Fe+3(aq) what will
happen when the reagent is added? - Answers KSCN
If it is Ni2+, the green solution will stay the same after adding the KSCN.
If it is Fe3+, the blood red solution will form after adding the KSCN.
the liquid that was carefully poured into a new container - Answers decantate
To carfully pour a liquid into another conatiner - Answers decant
name the chemical: K2CrO4 - Answers potassium chromate
You have two test tubes. One test tube contains Ag+(aq) solution and the other test tube
contains Bi+3(aq). Predict what will happen when HCl(aq) is added to both test tubes. If a
reaction occurs, what is the new chemical formula? - Answers Ag+ will form a white precipitate,
, AgCl.
Bi3+ will remain unchanged.
You have two test tubes. One test tube contains Pb+2(aq) solution and the other test tube
contains Bi+3(aq). Predict what will happen when HCl(aq) is added to both test tubes. If a
reaction occurs, what is the new chemical formula? - Answers Pb+2(aq) will form a white
precipitate, PbCl2(s). Bi+3(aq) will remain unchanged.
You have two test tubes. One test tube contains Pb+2(aq) solution and the other test tube
contains Cu+2(aq). Predict what will happen when HCl(aq) is added to both test tubes. If a
reaction occurs, what is the new chemical formula? - Answers Pb+2(aq) will form a white
precipitate, PbCl2(s). Cu+2(aq) will remain unchanged.
Which of the chemicals are oxidants? - Answers K2CrO4
The liquid above the solid in a mixture of solid and solution - Answers supernate
A solid compound that forms as a result of mixing reagents together in a solution - Answers
precipitate
A unique chemical used in this experiment is K4Fe(CN)6(aq). What is its name? - Answers
potassium ferrocyanide
NH3(aq) and NH4OH(aq) are different ways of writing the chemical formula of the which
chemical? - Answers aqueous ammonia
Select the steps that will compose a rationale for the cation Ni+2 being absent in an unknown. -
Answers A red-pink solid did not form after the addition of H2DMG in step 3-F.
Select the step(s) that will compose a rationale for the cation Ni+2 being present in an unknown
- Answers A precipitate formed when 6 M NaOH was added to the unknown solution in step 3-A
The precipitate from step 3-A dissolved in 6 M HNO3.
A strawberry red precipitate formed in step 3-F
Separation can be achieved when a reaction occurs in a mixture. The resulting mixture will have
one chemical species in a solution and the other chemical species as a solid. The mixture is
centrifuged and the supernate is decanted into a separate test tube. Now the solid and solution
are separated from each other.
What reagent could you add to a mixture of Ag+ and Cu+2 to separate the two species? -
Answers HCl
Separation can be achieved when a reaction occurs in a mixture. The resulting mixture will have
one chemical species in a solution and the other chemical species as a solid. The mixture is
