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22.2: Enthalpy

Difficulty Level: At Grade Created by: CK-12

Student Behavioral Objectives

The student will:

  • define and understand enthalpy of reaction.
  • calculate the enthalpy of reaction using ΔHrxn=ΔHproductsΔHreactants.
  • describe, interpret, and draw potential energy diagrams.
  • define and understand ΔHf.
  • define Hess’s Law.
  • calculate ΔH.

Timing, Standards, Activities

Timing and California Standards
Lesson Number of 60 min periods CA Standards
Enthalpy 2.0 7b, 7e

Activities for Lesson 2

Laboratory Activities

1. Hess's Law Lab


1. None


1. Enthalpy Worksheet

2. Hess's Law Worksheet

Extra Readings

1. None

Answers for Enthalpy (L2) Review Questions

  • Sample answers to these questions are available upon request. Please send an email to teachers-requests@ck12.org to request sample answers.

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