📚 Topic Summary
Melting and freezing are phase changes of matter. Melting is when a solid turns into a liquid, like an ice cube becoming water. Freezing is the opposite – when a liquid turns into a solid, like water becoming ice. This happens because of changes in temperature. When a substance gains heat, it might melt, and when it loses heat, it might freeze.
🧊 Part A: Vocabulary
Match the following terms with their correct definitions:
| Term |
Definition |
| 1. Melting |
a. The temperature at which a liquid turns into a solid. |
| 2. Freezing |
b. The change of state from liquid to solid. |
| 3. Freezing Point |
c. The change of state from solid to liquid. |
| 4. Melting Point |
d. The temperature at which a solid turns into a liquid. |
| 5. Temperature |
e. A measure of how hot or cold something is. |
Answers: 1-c, 2-b, 3-a, 4-d, 5-e
💧 Part B: Fill in the Blanks
Complete the sentences using the words provided: freezing, melting, heat, solid, liquid
- When ice cream sits out on a hot day, it starts ______.
- Water turns into a ______ when it freezes.
- _______ is needed to melt ice.
- ______ is when a liquid turns into a solid.
- A ______ has a fixed shape.
Answers: 1. melting, 2. solid, 3. Heat, 4. Freezing, 5. solid
🤔 Part C: Critical Thinking
Explain what happens to the molecules in an ice cube as it melts. Use what you know about temperature and phase changes.