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Grade 2 Science · World 5: Hot & Cold Kitchen · Level 33
Change It Back
Some changes can be undone: melted ice refreezes, a melted crayon hardens.
Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.
What children learn in Level 33
- Some changes can be undone. Melt an ice cube, and you get water.
- Put that water in the freezer, and it turns back into ice! Melting and freezing can go back and forth.
- Melted chocolate hardens again when it cools. A melted crayon hardens, too. It may have a new shape, but it's still crayon wax.
- To undo a change made by heating, cool it. To undo a change made by cooling, warm it up.
- Your turn! Sort these changes: can they be undone?
Georgia Standards of Excellence in Science:
- S2P1.c — Provide evidence from observations to construct an explanation that some changes in matter caused by heating or cooling can be reversed and some changes are irreversible. (Changes in matter could include heating or freezing of water, baking a cake, boiling an egg.)