AP Chemistry Chapter 4 Practice Exams 2025

AP Chemistry Chapter 4
Study online at https://quizlet.com/_fyupx5
1. (4.9) Oxidation numbers for Fe2O3 (per element): Fe = +3
O =-2
2. (4.2) Give a reason to explain why the following response is incorrect:
Ca(NO3)2(s) -> Ca(NO3)2(aq): Ca (NO3)2 (aq) breaks into ions
3. (4.1) Changes in intermolecular reactions are classified as...changes: Phys-
ical
(like phase changes)
4. (4.1) What kind of physical processes involve breaking of chemical bonds?-
: Ions dissolving in an aqueous solution - become disassociated
5. (4.1) Is a change in particle size, texture, or shape an example of a physical
or chemical change?: Physical
6. (4.1) When a mixture is separated into simplier substances with distillation,
chromatography, or filtration, is a chemical or physical change happening?: -
Physical - no new substances formed
7. (4.1) A change in color is...: Not necessarily a chemical change
8. (4.1) A change in energy is an example of a physical or chemical change?-
: Energy (especially heat or light)
9. (4.2) molecular equation: Each reactant and product is written as a neutral
compound
10. (4.2) net ionic equation: Where the spectator ions are eliminated
11. (4.2) SNAP: S = Sodium
N = Nítrate (NO3-)
A = Ammonium (NH3+)
P = Potassium (K)
12. (4.2) Drawing precipitate equations: Do not include precipitate ions floating
around unless excess reactant
13. (4.2) What are 2 electrolytes?: 1. Water soluble ionic compound (SNAP rule,
aq)
2. Strong acids (6 or 7)
14. (4.2) Complete ionic equatiaon: Shows all the ions
15. 7 strong acids: HCl, HBr, HI, HNO3, H2SO4, HClO3, HClO4
(So I Br(ought) N(o) Cl(ean) Cl(othes)
16. (4.2) nonelectrolyte: Covalent molecular substance made of neutral molecules
(no charged particles)
17. (4.2) Why does a sample of pure water not conduct electricity?: It is a
nonelectrolyte made of neutral molecules
18. (4.2) electrolyte: Have delocalized charged particles to conduct electricity -
movement of ions

1/9

, AP Chemistry Chapter 4
Study online at https://quizlet.com/_fyupx5
19. (4.2) Why does a sample of aqueous sucrose, C12H22O11(aq) not conduct
electricity?: not an electrolyte
neutral molecule without electrical charge
20. (4.2) Why does a piece of solid silver metal, Ag(s) conduct electricity?: Ag
is metal. Free floating or delocalized valence electrons conduct electricity.
21. (4.2) Why does a sample of solid crystals of sodium chloride, NaCI(s), does
not conduct electricity?: ions are locked into space in the crystalline solid and lack
mobility
22. (4.2) Why does a sample of aqueous methanol, CH3OH(ag) not con-
duct electricity?: methanst molecles are neutral molecules without any electrical
charges
23. (4.2) Why does a sample of aqueous potassium hydroxide, KOH(aq), con-
duct electricity?: k+ and oh- are dissociated and they have electrical charges and
also mobile
24. (4.2) Write a balanced chemical equation that represents what happens to
the solute particles when the solute is dissolved in water for barium hydroxide,
Ba(OH)2.: Ba(OH)2 (s) —> (H2O on top of arrow) Ba(OH)2 (aq)
25. (4.2) Write a balanced chemical equation that represents what happens
to the solute particles when the solute is dissolved in water for ethanol,
CH3CH2OH.: CH3CH2OH (l) —> (H2O over arrow) CH3CH2OH (aq)
26. (4.2) Give a reason to explain why the following response is incorrect:
Ca(NO3)2 (s) —> Ca(NO3)2 (aq): Ca (NO3)2 (aq) breaks into ions
27. (4.2) Give a reason to explain why the following response is incorrect:
Ca(NO3) (s) —> Ca (aq) + N2 (aq) + 3O2(aq): dissolving does not produce new
products
28. (4.2) Give a reason to explain why the following response is incorrect:
Ca(NO3) (s) —> Ca (aq) + 2NO3 (aq): Ions should have electrical charges
29. (4.2) Give a reason to explain why the following response is incorrect:
Ca(NO3) (s) —> Ca+ (aq) +2NO3- (aq): Ca+ should be Ca2+
30. 4.2) Give a reason to explain why the following response is incorrect:
Ca(NO3) (s) —> Ca2+ (aq) + 2N3-(aq) + 6 O2- (aq): NO3- is missing
31. (4.2) Give a reason to explain why the following response is incorrect:
Ca(NO3) (s) —> Ca2+ (aq) + NO3- (aq): 2 NO3- instead of NO3-
32. (4.2) Give a reason to explain why the following response is incorrect:
Ca(NO3) (s) —> Ca2+ (aq) +2NO3- (aq) + H2O (l): H2O (l) is not needed
33. (4.2) Do you predict that a precipitate will be formed when solutions of
NH4NO3(aq) and Na2SO4(aq) are combined? Justify your answer based on
the solubility rules for the "SNAP" ions.: No. Neither compound will precipitate.
NH4+ and NO3- are universally soluble in water.
2/9