AP CHEMISTRY 2026-2027 EXAM PREP –
ADVANCED PLACEMENT CHEMISTRY PRACTICE
QUESTIONS, ANSWER KEY & COMPREHENSIVE
STUDY GUIDE
Use the following answers for questions 1 - 3.
(A) F
(B) S
(C) Mg
(D) Ar
(E) Mn
1. Forms monatomic ions with 2¯ charge in solutions
2. Forms a compound having the formula KXO4
3. Forms oxides that are common air pollutants and that yield acidic solution in water
Use the following answers for questions 4 - 7.
(A) Hydrofluoric acid
(B) Carbon dioxide
(C) Aluminum hydroxide
(D) Ammonia
(E) Hydrogen peroxide
4. Is a good oxidizing agent
5. Is used to etch glass chemically
6. Is used extensively for the production of fertilizers
,7. Has amphoteric properties
Use the following answers for questions 8 - 9.
(A) A network solid with covalent bonding
(B) A molecular solid with zero dipole moment
(C) A molecular solid with hydrogen bonding
(D) An ionic solid
(E) A metallic solid
8. Solid ethyl alcohol, C2H5OH
9. Silicon dioxide, SiO2
Use the following answers for questions 10 - 13.
(A) CO 2¯
(B) Cr2O 2¯
(C) NH +
(D) Ba2+
(E) Al3+
, Assume that you have an "unknown" consisting of an aqueous solution of a salt that
contains one of the ions listed above. Which ions must be absent on the basis of each of the
following observations of the "unknown"?
10. The solution is colorless
11. The solution gives no apparent reaction with dilute hydrochloric acid.
12. No odor can be detected when a sample of the solution is added drop by drop to a
warm solution of sodium hydroxide.
13. No precipitate is formed when a dilute solution of H2SO4 is added to a sample of the
solution.
Questions 14-17
The spontaneous reaction that occurs when the cell above operates is:
2Ag+ + Cd(s) ---> 2 Ag(s) + Cd2+
(A) Voltage increases.
(B) Voltage decreases but remains at zero.
(C) Voltage becomes zero and remains at zero.
(D) No change in voltage occures.
(E) Direction of voltage change cannot be predicted without additional information.
Which of the above occurs for each of the following circumstances?
14. A 50-milliliter sample of a 2-molar Cd(NO3)2 solution is added to the left beaker.
15. The silver electrode is made larger.
16. The salt bridge is replaced by a platinum wire
17. Current is allowed to flow for 5 minutes
ADVANCED PLACEMENT CHEMISTRY PRACTICE
QUESTIONS, ANSWER KEY & COMPREHENSIVE
STUDY GUIDE
Use the following answers for questions 1 - 3.
(A) F
(B) S
(C) Mg
(D) Ar
(E) Mn
1. Forms monatomic ions with 2¯ charge in solutions
2. Forms a compound having the formula KXO4
3. Forms oxides that are common air pollutants and that yield acidic solution in water
Use the following answers for questions 4 - 7.
(A) Hydrofluoric acid
(B) Carbon dioxide
(C) Aluminum hydroxide
(D) Ammonia
(E) Hydrogen peroxide
4. Is a good oxidizing agent
5. Is used to etch glass chemically
6. Is used extensively for the production of fertilizers
,7. Has amphoteric properties
Use the following answers for questions 8 - 9.
(A) A network solid with covalent bonding
(B) A molecular solid with zero dipole moment
(C) A molecular solid with hydrogen bonding
(D) An ionic solid
(E) A metallic solid
8. Solid ethyl alcohol, C2H5OH
9. Silicon dioxide, SiO2
Use the following answers for questions 10 - 13.
(A) CO 2¯
(B) Cr2O 2¯
(C) NH +
(D) Ba2+
(E) Al3+
, Assume that you have an "unknown" consisting of an aqueous solution of a salt that
contains one of the ions listed above. Which ions must be absent on the basis of each of the
following observations of the "unknown"?
10. The solution is colorless
11. The solution gives no apparent reaction with dilute hydrochloric acid.
12. No odor can be detected when a sample of the solution is added drop by drop to a
warm solution of sodium hydroxide.
13. No precipitate is formed when a dilute solution of H2SO4 is added to a sample of the
solution.
Questions 14-17
The spontaneous reaction that occurs when the cell above operates is:
2Ag+ + Cd(s) ---> 2 Ag(s) + Cd2+
(A) Voltage increases.
(B) Voltage decreases but remains at zero.
(C) Voltage becomes zero and remains at zero.
(D) No change in voltage occures.
(E) Direction of voltage change cannot be predicted without additional information.
Which of the above occurs for each of the following circumstances?
14. A 50-milliliter sample of a 2-molar Cd(NO3)2 solution is added to the left beaker.
15. The silver electrode is made larger.
16. The salt bridge is replaced by a platinum wire
17. Current is allowed to flow for 5 minutes
