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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
2 and 3

1 answer

To identify the physical changes from the table, we need to look for the characteristics of physical changes versus chemical changes.

  1. Physical changes do not produce new substances, while chemical changes do.
  2. A physical change may involve changes in state (temperature change) or form, but reactants remain the same.

Based on the table:

  • Change #1: Reacts with another substance (yes), generates a temperature change (yes), produces gas/sound/light (yes), and forms a new substance (yes). This indicates a chemical change.
  • Change #2: Does not react with another substance (no), generates a temperature change (yes), produces gas/sound/light (yes), and does not form a new substance (no). This indicates a physical change.
  • Change #3: Reacts with another substance (yes), generates a temperature change (yes), produces gas/sound/light (yes), and forms a new substance (yes). This indicates a chemical change.
  • Change #4: Does not react with another substance (no), generates no temperature change (no), produces no gas/sound/light (no), and does not form a new substance (no). This indicates a physical change.

Based on this analysis, the physical changes are represented by Change #2 and Change #4.

Therefore, the correct response is:

2 and 4