Unit 3 of 5
Study guide for CLEP CLEP Chemistry — Unit 3: Reactions and Stoichiometry. Practice questions, key concepts, and exam tips.
105
Practice Questions
45
Flashcards
6
Key Topics
Try these 5 questions from this unit. Sign up for full access to all 105.
What type of reaction occurs between AgNO3 and NaCl?
Precipitation reaction
Acid-base reaction
Oxidation-reduction reaction
Synthesis reaction
Decomposition reaction
Answer: A — Precipitation reaction is correct because AgNO3 and NaCl form a precipitate of AgCl.
What is the decomposition of H2O2 by MnO2?
Thermal decomposition
Electrolytic decomposition
Photolytic decomposition
Hydrolytic decomposition
Catalytic decomposition
Answer: E — Catalytic decomposition is correct because a catalyst speeds up reaction.
If 50 mL of 0.2 M HCl is mixed with 50 mL of 0.2 M NaOH, what is the resulting concentration of NaCl?
0.05 M
0.5 M
0.1 M
0.2 M
0.4 M
Answer: C — 0.1 is correct because HCl and NaOH react in a 1:1 ratio, so the number of moles of NaCl formed will be equal to the number of moles of either reactant, which is 0.2 M * 0.05 L = 0.01 mol, and the total volume is 100 mL or 0.1 L, so the concentration is 0.01/0.1 = 0.1 M.
What type of reaction occurs when silver nitrate is added to sodium chloride?
Acid-base reaction
Oxidation-reduction reaction
Neutralization reaction
Combustion reaction
Precipitation reaction
Answer: E — Precipitation reaction is correct because the reaction forms a solid precipitate of silver chloride.
A reaction mechanism with two steps has the following rate constants: k1 = 0.1 and k2 = 0.05 . Which step is the rate-determining step?
step 1
cannot be determined
both steps
step 2
neither step
Answer: D — step 2 is correct because the rate-determining step is the slowest step in the reaction mechanism, and since k2 (0.05 s^-1) is less than k1 (0.1 s^-1), step 2 is the slowest step.
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