Ap Chemistry Review Sheet - Winston Churchill High School, 2016-2017 Page 14
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15AP Chemistry
Summer Review
Winston Churchill High School
2016-2017
Short Answer Problems from Previous AP EXAMS
2. The reaction between silver ion and solid zinc is represented by the following
equation:
2Ag
(aq) + Zn (s) Zn
(aq) + 2Ag (s)
+
+2
A 1.50 g sample of Zn is combined with 250 mL of 0.110 M AgNO
at 25°C.
3
a. Identify the limiting reagent. Show calculations to support your answer.
b. On the basis of the limiting reactant that you identified in part (i),
determine the value of [Zn
] after the reaction is complete.
+2
3. Consider the hydrocarbon pentane, C
H
(molar mass 72.15 g).
5
12
a. Write the balanced equation for the combustion of pentane to yield carbon
dioxide and water.
b. What volume of dry carbon dioxide, measured at 25°C and 785 mmHg,
will result from the complete combustion of 2.50 g pentane?
4) Find the mass percent of nitrogen in each of the following compounds:
a. NO
b. NO
2
c. N
O
2
4
d. N
O
2
5) Benzene contains only carbon and hydrogen and has a molar mass of 78.1 g/mol.
Analysis shows the compound to be 7.74% H by mass. Find the empirical and
molecular formulas of benzene.
6) Calcium carbonate decomposes upon heating, producing calcium oxide and carbon
dioxide gas.
a. Write a balanced chemical equation for this reaction.
b. How many grams of calcium oxide will be produced after 12.25 g of calcium
carbonate is completely decomposed?
c. What volume of carbon dioxide gas is produced from this amount of calcium
carbonate, at STP?
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