π Topic Summary
Physical changes are when a substance changes its appearance but doesn't become a new substance. Think about folding a piece of paper β it looks different, but it's still paper! Melting, freezing, boiling, tearing, and dissolving are all examples of physical changes. The key is that the substance's chemical makeup stays the same. No new substances are formed during a physical change.
π€ Part A: Vocabulary
Match the words with their meanings:
| Words |
Meanings |
| 1. Melting |
A. Changing from liquid to solid |
| 2. Freezing |
B. Mixing a substance into a liquid |
| 3. Boiling |
C. Changing from solid to liquid |
| 4. Dissolving |
D. Changing from liquid to gas |
| 5. Tearing |
E. Breaking an object into smaller pieces. |
Answers: 1-C, 2-A, 3-D, 4-B, 5-E
βοΈ Part B: Fill in the Blanks
Fill in the blanks with the correct words from the word bank. Word Bank: Physical, Size, Shape, New, Dissolving
A ________ change is a change in the _______ or _______ of a substance, but no _______ substance is formed. An example is ________ sugar in water.
Answers: Physical, Size, Shape, New, Dissolving
π€ Part C: Critical Thinking
Give an example of a physical change you see in your kitchen and explain why it is a physical change.
Example Answer: Cutting a sandwich in half is a physical change because the sandwich pieces are smaller, but they're still sandwich. No new substance was created.