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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\begin{align*} \Delta H_{rxn} = \Delta H_{products} - \Delta H_{reactants} \end{align*}.
• describe, interpret, and draw potential energy diagrams.
• define and understand ΔHf\begin{align*} \Delta H_f \end{align*}.
• define Hess’s Law.
• calculate ΔH\begin{align*} \Delta H \end{align*}.

## 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

Demonstrations

1. None

Worksheets

1. Enthalpy Worksheet

2. Hess's Law Worksheet

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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