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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.

125

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 125.

Q1MEDIUM

What type of reaction occurs between AgNO3 and NaCl?

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

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

Q2MEDIUM

What is the Arrhenius definition of a base?

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

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

Q3EASY

Which type of reaction occurs when water decomposes into hydrogen and oxygen?

A) Combustion
B) Synthesis
C) Replacement
D) Decomposition
E) Neutralization
Show Answer

Answer: D — Decomposition is correct because decomposition involves breakdown.

Q4HARD

What is the decomposition of H2O2 by MnO2?

A) Thermal decomposition
B) Electrolytic decomposition
C) Photolytic decomposition
D) Hydrolytic decomposition
E) Catalytic decomposition
Show Answer

Answer: E — Catalytic decomposition is correct because a catalyst speeds up reaction.

Q5EASY

A researcher uses an ICE table to find Kc. What is Kc?

A) Rate constant for a reaction
B) Equilibrium constant for a reaction
C) Ionization constant for water
D) Dissociation constant for a base
E) Formation constant for a complex
Show Answer

Answer: B — Equilibrium constant for a reaction is correct because Kc is the equilibrium constant for a reaction in terms of concentrations.

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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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