Name ___________________________
Block _____
Date ________
Chapter 3 & 4 Test Review
AP Chemistry
Directions: Each set of lettered choices below refers to the numbered statements immediately following it. Select the one
lettered choice that best fits each statement and then fill in the corresponding oval on the answer sheet. A choice may be
used once, more than once, or not at all in each set.
1) A chemical reaction is a process in which
a) reactants change into products
b) substances with new chemical and physical properties
are formed
c) the law of conservation of mass applies
d) all of the above
2) Carbon – 12 is the standard isotope for expressing the
___________ of the elements.
a) nuclear charge
b) atomic mass
c) atomic number
d) ion distribution
e) molarity
3) What number of atoms of O are in 4.2 mol of P 4O10?
(Molecular weight P4O10 = 284)
a) 2.52 X 1023
b) 2.52 X 1024
c) 2.52 X 1025
d) 6.98 X 10-24
e) 6.98 X 10-25
4. When the equation, C4H10 + O2  CO2 + H2O is
balanced with the smallest set of integers, the sum of the
coefficients is
a. 4
b. 28
c. 33
d. 15
5. Baking powder, a mixture of cream of tartar
(KHC4H4O6, molar mass 188 g/mol) and baking soda
(NaHCO3, molar mass 84.0), undergoes the following
reaction at baking temperatures:
KHC4H4O6 + NaHCO3  KNaC4H4O6 + H2O + CO2
(The CO2 makes the cake rise.) A recipe calls for two
level teaspoons (a total of 8.0 g) of cream of tartar. How
much baking soda must be added for both materials to
react completely?
a. 0.45 g
b. 3.6 g
c. 18 g
d. 8.0 g
6. Consider the following unbalanced equation:
KO2 + H2O  KOH + O2 + H2O2
For every 3.0 mol of KO2, ______ mol of H2O is needed
for a complete reaction.
a. 1.0
b. 2.0
c. 3.0
d. 6.0
7. How many moles of P4 molecules are there in 143.8 g
of phosphorus?
a. 0.2154 mol
b. 0.8615 mol
c. 1.161 mol
d. 4.643 mol
8. What is the subscript of aluminum in the formula for
aluminum phosphate?
a. 1
b2
c. 3
d. 4
9. In the reaction 2 A + B  3 C + D, 3.0 mol A and 2.0
mol B react to form 4.0 mol C. What is the percent yield
of this reaction?
a. 50%
b. 67%
c. 75%
d. 89%
10. Determine the concentration of a solution made by
dissolving 10.0 g of sodium chloride in 750.0mL
solution.
a. 0.0133 M
b. 0.133 M
c. 0.171 M
d. 0.228 M
11. What volume of 2.00 M sodium hydroxide is
required to prepare 150.0 mL of 0.800 M NaOH?
a. 375 mL
b. 150. mL
c. 120. mL
d. 60.0 mL
12. How many grams of solute are contained in 141 mL
of a 0.175 M silver nitrate solution?
a. 6.85 g
b. 4.19 g
c. 0.145 g
d. 3.80 g
18. What volume of 0.25 M HNO3 is necessary to react
exactly with 7.4 g of Ca(OH)2?
a. 2.0 × 102 mL
b. 2.5 × 102 mL
c. 4.0 × 102 mL
d. 8.0 × 102 mL
13. An unknown substance is 49.32% C, 6.85% H, and
43.84% O by mass. What is its empirical formula?
a. C3H5O2
b. C3H3O4
c. C2HO3
d. C2H5O4
15. Lead(II) nitrate reacts with sodium chloride in
aqueous solution to form a precipitate. What is the net
ionic equation for this reaction?
a. Pb2+(aq) + 2NO3-(aq)  Pb(NO3)2(s)
b. Na+(aq) + Cl-(aq)  NaCl(s)
c. Pb2+(aq) + 2Cl-(aq)  PbCl2(s)
d. Na+(aq) + NO3-(aq)  NaNO3(s)
16. When aqueous sodium hydroxide is added to aqueous
nitric acid, what is the balanced molecular equation for
the reaction that takes place?
a. 2 NaOH(aq) + H2NO3(aq)  Na2NO3(aq) + 2H2O(l)
b. Na(OH)2(aq) + H2NO3(aq)  Na2NO3(aq) + 2 H2O(l)
c. NaOH(aq) + HNO3(aq)  NaNO3(aq) + H2O(l)
d. NaOH(aq) + HNO4(aq)  NaNO4(aq) + H2O(l)
17. Magnesium metal reacts with hydrochloric acid to
form aqueous magnesium chloride and hydrogen gas.
When 3.65 g of magnesium is added to 50.0 mL of 3.00
M hydrochloric acid, what mass of hydrogen is produced
assuming a complete reaction?
a. 0.123 g
b. 0.151 g
c. 0.246 g
d. 0.302 g
23. A 6.32-g sample of potassium chlorate was
decomposed according to the following equation:
2 KClO3  2KCl + 3O2
How many moles of oxygen are formed?
a. 1.65 g
b. 0.051 moles
c. 0.0344 moles
d. 0.0774 moles
24. How many grams of H2O will be formed when 32.0 g
H2 is mixed with 32.0 g O2 and allowed to react to form
water?
a. 36.0 g
b. 288 g
c. 18.0 g
d. 64.0 g
25. To calculate the concentration in moles per liter of a
salt solution, you need to know
a. the mass of the salt added to the solution and the
volume of water added to the solution.
b the mass of the salt added to the solution and the total
volume of the solution.
c. the mass of the salt added, the molar mass of the salt,
and the total volume of the solution.
d. the molar mass of the salt and the total volume of the
solution.
CLEARLY SHOW THE METHOD USED AN STEPS INVOLVED IN ARRIVING AT YOUR ANSWERS. It is to your
advantage to do this, because you may earn partial credit if you do and you will receive little or no credit if you do not.
Attention should be paid to significant figures.
1) A sample of aluminum chloride is made by reacting scrap 3.5 g aluminum with 5.6 g chlorine gas.
i) Write the balanced chemical equation for the reaction.
ii) Determine how many grams of the product are produced?
2) In a titration experiment, 12.55 mL of 0.520 M KOH is used to titrate 25.00 mL of H2SO4.
i) Write a balanced equation for this reaction
ii) Determine the molarity of the sulfuric acid.
ANSWERS
1d
2b
3c
4c
5b
6c
7c
8a
9d
10d
11d
12b
13a
15c
16c
17b
18d
23d
24c
25c
1) A sample of aluminum chloride is made by reacting scrap 3.5 g aluminum with 5.6 g chlorine gas.
i) Write the balanced chemical equation for the reaction.
ii) Determine how many grams of the product are produced?
2) In a titration experiment, 12.55 mL of 0.520 M KOH is used to titrate 25.00 mL of H2SO4.
i) Write a balanced equation for this reaction
ii) Determine the molarity of the sulfuric acid.