A) 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 2 and 3 2 and 3 1 and 2 1 and 2 1 and 4 1 and 4

Answer 1

To identify physical changes from the table, we need to look for changes that do not involve the formation of new substances.

Observations for each change:

• Change 1: Reacts with another substance? Yes; New substance formed? Yes – this is a chemical change.
• Change 2: Reacts with another substance? No; New substance formed? No – this is a physical change.
• Change 3: Reacts with another substance? Yes; New substance formed? Yes – this is a chemical change.
• Change 4: Reacts with another substance? No; New substance formed? No – this is a physical change.

Physical changes do not result in new substances being formed. Based on the observations, the physical changes are Changes 2 and 4.

Therefore, the correct response is: 2 and 4.