Heating Can Make a Change That Cannot Go Back Again

Learning Resource Type

Classroom Resource

Subject Area

Science

Grade(s)

2

Overview

In this lesson, students will be able to explain that when some substances are heated to a certain extent, they change in a way that cannot be changed back by cooling them.  

Students see a time-lapse video of cookie dough being baked into cookies. Students participate in a class discussion about heat-causing changes that cannot be reversed when cooled. Students learn that heating baking powder in the cookie dough makes gas and causes little holes in the cookie. Students design and conduct an experiment to see if baking powder causes more bubbling when it is warm or cold.

Science (2015) Grade(s): 2

SC15.2.4

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).

UP:SC15.2.4

Vocabulary

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

Knowledge

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.

Skills

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

Understanding

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

CR Resource Type

Lesson/Unit Plan

Resource Provider

American Chemical Society

License Type

Custom
ALSDE LOGO