Grade 2 · Science · Lesson 18

Observe Heating and Cooling Effects

In Lesson 17 we learned that matter exists as a solid, liquid, or gas. Today we look closely at what causes matter to change from one state to another — and we observe those changes happening around us every day.

What this lesson teaches

1Name the four state-change processes: melting, freezing, evaporating, and condensing
2Match everyday substances to the state change that occurs when heated or cooled
3Explain that most heating and cooling state changes are reversible

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