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

Answer 1

To determine which changes are physical changes, we need to identify the characteristics of physical changes. Physical changes typically involve a change in state or form but do not result in the formation of new substances.

Looking at the table provided:

1. Change #1: Reacts with another substance? (yes), Temperature change? (yes), Gas, sound, or light produced? (yes), New substance formed? (yes) - This is a chemical change.
2. Change #2: Reacts with another substance? (no), Temperature change? (yes), Gas, sound, or light produced? (yes), New substance formed? (no) - This could indicate a physical change since no new substance is formed.
3. Change #3: Reacts with another substance? (yes), Temperature change? (yes), Gas, sound, or light produced? (yes), New substance formed? (yes) - This is a chemical change.
4. Change #4: Reacts with another substance? (no), Temperature change? (no), Gas, sound, or light produced? (no), New substance formed? (no) - This is also a physical change because there are no chemical reactions and no new substances formed.

Based on this analysis, the changes that are physical changes (changes #2 and #4) are correctly identified.

The correct response to the question is: 2 and 4.