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 2 1 and 2 1 and 4 1 and 4 2 and 3

Answer 1

To determine which changes shown in the table are physical changes, we need to identify which changes do not produce new substances. Physical changes typically involve alterations in physical properties (like state, shape, or appearance) without changing the chemical composition of the substance.

Looking at the table:

- Change 1: Reacts with another substance? Yes **(Chemical change)**; Temperature change? Yes; Gas, sound, or light produced? Yes; New substance formed? Yes.
- Change 2: Reacts with another substance? No **(Physical change)**; Temperature change? Yes; Gas, sound, or light produced? Yes; New substance formed? No.
- Change 3: Reacts with another substance? Yes **(Chemical change)**; Temperature change? Yes; Gas, sound, or light produced? Yes; New substance formed? Yes.
- Change 4: Reacts with another substance? No **(Physical change)**; Temperature change? No; Gas, sound, or light produced? No; New substance formed? No.

Based on this analysis:
- Change 2 qualifies as a physical change, as it does not react with another substance and does not form a new substance.
- Change 4 also qualifies as a physical change since it does not react with another substance and does not form a new substance.

Therefore, the changes that are physical changes are **Changes 2 and 4**.

So the correct response is: **2 and 4**.