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Unit 3 of 5

Unit 3: Reactions and Stoichiometry

Study guide for CLEP CLEP Chemistry — Unit 3: Reactions and Stoichiometry. Practice questions, key concepts, and exam tips.

50

Practice Questions

17

Flashcards

6

Key Topics

Key Concepts to Study

balancing equations
limiting reagents
mole conversions
reaction types
organic functional groups
isomerism (structural and stereo)

Sample Practice Questions

Try these 5 questions from this unit. Sign up for full access to all 50.

Q1EASY

What type of reaction occurs between AgNO3 and NaCl?

A) Acid-base reaction
B) Oxidation-reduction reaction
C) Precipitation reaction
D) Synthesis reaction
E) Decomposition reaction
Show Answer

Answer: C — Precipitation reaction is correct because AgNO3 and NaCl form a precipitate of AgCl.

Q2EASY

What is the Arrhenius definition of a base?

A) A substance that donates a proton
B) A substance that accepts a proton
C) A substance that produces hydroxide ions in water
D) A substance that produces hydrogen ions in water
E) A substance that is neutral
Show Answer

Answer: C — A substance that produces hydroxide ions in water is correct because Arrhenius defined a base as a substance that produces hydroxide ions in water..

Q3HARD

What is the standard reduction potential of the half-reaction Cu2+ + 2e- → Cu?

A) -0.34 V
B) +0.34 V
C) -0.74 V
D) +0.74 V
E) +0.50 V
Show Answer

Answer: B — +0.34 V is correct because the standard reduction potential of the half-reaction Cu2+ + 2e- → Cu is +0.34 V. The most tempting distractor, -0.34 V, would be the oxidation potential.

Q4EASY

What type of reaction occurs when silver nitrate is added to sodium chloride?

A) Acid-base reaction
B) Oxidation-reduction reaction
C) Precipitation reaction
D) Neutralization reaction
E) Combustion reaction
Show Answer

Answer: C — Precipitation reaction is correct because the reaction forms a solid precipitate of silver chloride.

Q5MEDIUM

A student conducts an experiment to measure the effect of temperature on the rate of a chemical reaction. The student collects data at 20°C, 30°C, and 40°C, but realizes that the thermometer used has an uncertainty of ±0.5°C. Which of the following statements is most likely to be true about the experimental results?

A) The uncertainty in the thermometer will have no effect on the measured rate of reaction.
B) The uncertainty in the thermometer will result in a systematic error that affects all measurements equally.
C) The uncertainty in the thermometer will result in a random error that affects each measurement differently.
D) The uncertainty in the thermometer will only affect the measurements at 30°C and 40°C, but not at 20°C.
E) The uncertainty in the thermometer will result in a constant error that shifts all measurements by 0.5°C
Show Answer

Answer: C — The uncertainty in the thermometer will introduce a random error, affecting each measurement differently.

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Study Tips for Unit 3: Reactions and Stoichiometry

  • Focus on understanding concepts, not memorizing facts — CLEP tests application
  • Practice with timed questions to build exam-day speed
  • Review explanations for wrong answers — they reveal common misconceptions
  • Use flashcards for key terms, practice questions for deeper understanding

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