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AP Chemistry 6.1: Energy Changes

Practice AP Chemistry questions on identifying endothermic or exothermic processes from temperature observations and explaining energy transfer between a system and surroundings.

Syllabus
Effective Fall 2025
Course
AP Chemistry

Exam points

  • Explain how molecular structure, bonding and periodic trends determine chemical properties and reactivity.
  • Apply electron configurations and particle models to predict structure, polarity and physical behavior.

6.1.A—Explain the relationship between experimental observations and energy changes associated with a chemical or… question 1

[Maximum number: 1]

Answer the following questions about an experiment in which CaCO3(s)\mathrm{CaCO}_{3}(s) is combined with HCl(a q), represented by the following balanced equation.

CaCO3(s)+2HCl(aq)→CaCl2(aq)+CO2(g)+H2O(l)\mathrm{CaCO}_{3}(s)+2 \mathrm{HCl}(a q) \rightarrow \mathrm{CaCl}_{2}(a q)+\mathrm{CO}_{2}(g)+\mathrm{H}_{2} \mathrm{O}(l)

Is the reaction endothermic or exothermic? Justify your answer using the information in the table.

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