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Lesson 4 of 84 · Matter and Atoms
ExperimentChanging States: Melting and Freezing
What You'll Learn
Physical changes alter the appearance of matter without changing its chemical identity. Cutting paper, melting ice, and dissolving sugar are all physical changes.
Key Words
- proton
- neutron
- electron
Materials Needed
- ice cubes
- salt
- sugar
Safety First
- Use materials only as directed in the experiment.
- Keep small objects away from young children.
Steps
Step 1 — Read
Read and learn: Physical changes alter the appearance of matter without changing its chemical identity. Cutting paper, melting ice, and dissolving sugar are all physical changes.
Step 2 — Do
Conduct the experiment by following the instructions.
Step 3 — Observe
Look for patterns in your observations.
Step 4 — Record
Make a graph or chart showing your results.
Check Your Understanding
Question 1
1 of 3Which is an example of a chemical change?