How cooling and heating affect matter
How cooling and heating affect matter

How cooling and heating affect matter

I can describe how matter can change state when it is either heated or cooled.

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In this lesson, students will review the three states of matter. Then they will identify how matter can change state when it is heated or cooled and be provided with different examples of these changes. Students will determine if the matter is melting, freezing, or evaporating.



Learning Objective

Students will be able to explain how matter changes when it is heated and cooled.


Students begin by thinking about what would happen to different items out in the sun or in a cold environment. These items include an icy, cold drink, an ice cream cone, and a bar of chocolate. After this, review the three states of matter with students. Have students drag to sort items into the correct state of matter.


Explain heating and cooling to students. Provide examples of sources of each like the sun, fire, a hairdryer, or a freezer. Next, explain what happens when matter is heated. Matter can turn from a solid to a liquid. Have students drag the statements into the green boxes to see what happens to the items if they are heated. Then explain what evaporation is and show examples. Finally, explain what happens when matter is cooled. After this, students will determine if different images depict matter being cooled or heated. Students will then read passages and determine if the matter is melting, evaporating, or freezing.


Check student understanding with ten questions consisting of true or false and multiple-choice questions.


To conclude, students will take part in an experiment. Blow a hot hairdryer onto crayons and observe the changes that occur before, during, and after the crayons are heated. Have students take note of their observations. What happened when the crayon began to be heated? When the dryer was turned off and the crayon cooled again, what happened to the state of matter?

Instruction materials

For the closing activity, you will need crayons, a canvas, a hairdryer, and hot glue. Have everything set up before class. Glue the crayons to one side of the canvas for the experiment.

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