Question

Use the table of observed changes to answer the question. Change # Reacts with another substance? Temperature change? Gas, sound, or light produced? New substance formed? 1 yes yes yes yes 2 no yes yes no 3 yes yes yes yes 4 no no no no Which changes shown in the table are physical changes? (1 point) Responses 2 and 4 2 and 4 1 and 4 1 and 4 2 and 3 2 and 3 1 and 2 1 and 2

Answer 1

To determine which changes in the table are physical changes, we need to look for changes that do not involve a reaction that produces new substances.

Based on the provided information:

- Change 1: Reacts with another substance (yes), new substance formed (yes) -> **Not a physical change**
- Change 2: Does not react with another substance (no), new substance formed (no) -> **Could be a physical change**
- Change 3: Reacts with another substance (yes), new substance formed (yes) -> **Not a physical change**
- Change 4: Does not react with another substance (no), new substance formed (no) -> **Could be a physical change**

Since physical changes do not result in the formation of new substances, we look at Changes 2 and 4, which both do not involve a reaction that produces new substances.

Therefore, the correct response is **2 and 4**.