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 2 and 4 2 and 4 1 and 2

Answer 1

To determine which changes in the table are physical changes, we should first review the characteristics of physical changes. A physical change typically does not involve a change in the substance's chemical composition, and often these changes can be observed through changes in state, shape, or appearance without producing new substances.

Based on the table:

1. Change #1: Reacts with another substance? Yes (Chemical change)
2. Change #2: Reacts with another substance? No (Physical change)
3. Change #3: Reacts with another substance? Yes (Chemical change)
4. Change #4: Reacts with another substance? No (Physical change)

From this, we can summarize:

• Changes that are physical: Change #2 and Change #4.

Thus, the changes shown in the table that are physical changes are 2 and 4.

The correct response is: 2 and 4.