Changing 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

atom
element

Materials Needed

vinegar
baking soda
cups
spoons
food coloring
plastic bottles

Safety First

Be careful with scissors — ask an adult for help if needed.
Do not look directly at the sun or bright lights.
Clean up spills immediately to prevent slipping.

Steps

Step 1 — Read

Review the background information on Properties of Matter before starting.

Step 2 — Do

Heat ice and record the temperature every minute as it melts and then boils. Graph the temperature changes and label each phase change.

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 3

Which is an example of a chemical change?