Second Grade · Science · week 5

Cooling: freeze experiments

Investigate how cooling changes a liquid into a solid, and describe freezing as the reverse of melting.

When you take heat away from some liquids, they freeze, meaning they turn into a solid. Water freezes into ice. Juice freezes into a popsicle. Cooling is the cause; freezing is the change, and it runs in the opposite direction from melting.

A freezer removes heat very well, which is why liquids placed inside turn solid over time. The colder the spot, and the longer you wait, the more likely a liquid is to freeze solid all the way through.

📋 For the teacher
Teach it (10–15 min):
  • Freeze a small cup of water or juice together and predict the result before checking the next day.
  • Ask your child to describe the liquid before freezing and the solid after, comparing the two.
  • Connect this week directly back to last week: ask which direction is melting and which is freezing.
  • If it gets cold enough outside where you live, look for a frozen puddle or frost as a real-world example.
Talk about it:
  • What happened to the liquid after a night in the freezer?
  • How is freezing the opposite of melting?
  • Have you ever seen something freeze outside without a freezer?

Mastery looks like: They can predict and confirm that cooling turns a liquid into a solid and explain freezing as the reverse of melting.

Common stumbles: Thinking freezing can only happen inside a freezer; not yet connecting melting and freezing as opposite changes.

Homework for this lessonType it, write it with a stylus, or print it for pencil & paper.open →
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