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

thermometer
strainer
ice cubes
salt
sugar
vinegar

Safety First

Handle glass items carefully to avoid breakage.

Steps

Step 1 — Read

Review the background information on 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?