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AP Chemistry Unit 6.1: Energy Changes

Practice AP Chemistry Unit 6.1 questions on classifying energy changes from temperature observations and explaining heat transfer between systems and surroundings.

Syllabus
Effective Fall 2025
Course
AP Chemistry

Exam points

  • Use stoichiometric and molecular models to analyze reactions, quantities, and composition from experimental data.
  • Calculate mass, moles, concentration, and formula relationships using balanced equations and measured observations.

Covered syllabus points

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

6.1 Endothermic and Exothermic Processes 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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