Work in Progress
Please pardon our progress while we refine the look and functionality of our new ALEX site! You can still access the old ALEX site at If you would like to share feedback or have a question for the ALEX Team, you can use the contact form here, or email us directly at

Learning Resource Type

Classroom Resource

Changes Caused By Heating and Cooling

Subject Area





In this lesson, students will be able to explain that cooling water can change it to ice and that heating ice can change it back to liquid water. Students will be able to explain that this process can also happen to other substances. Students will also be able to explain that heating a substance makes its molecules move faster and cooling a substance makes its molecules move slower. The lesson can also be used to lay a foundation for learning about changes in state and chemical changes which can be further developed in later grades.

    Science (2015) Grade(s): 2


    Provide evidence that some changes in matter caused by heating or cooling can be reversed (e.g., heating or freezing of water) and some changes are irreversible (e.g., baking a cake, boiling an egg).

    Unpacked Content



    • Properties
    • Evidence
    • Change
    • Matter
    • Heating
    • Cooling
    • Reversible
    • Irreversible


    Students know:
    • Characteristics of materials before heating or cooling.
    • Characteristics of materials after heating and cooling.
    • Characteristics of materials when heating or cooling is reversed.


    Students are able to:
    • Analyze evidence to support a claim that heating and cooling causes change in matter.


    Students understand that:
    • Heating or cooling a substance may cause changes that can be observed. Sometimes these changes are reversible and sometimes they are not.

    Scientific and Engineering Practices

    Engaging in Argument from Evidence

    Crosscutting Concepts

    Cause and Effect
    Link to Resource

    CR Resource Type

    Lesson/Unit Plan

    Resource Provider

    American Chemical Society

    License Type