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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 3

2 and 4

1 and 2

1 and 4

1 answer

To determine which changes shown in the table are physical changes, we need to look for changes that do not produce new substances and are typically reversible.

In the provided changes:

  • 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.
  • Change 2: Reacts with another substance (no), temperature change (yes), gas, sound, or light produced (yes), new substance formed (no) – this change does not produce a new substance, but does have a temperature change and produces gas, sound, or light; could be a physical change or a chemical that doesn't result in a new substance (more likely a physical change).
  • 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.
  • Change 4: Reacts with another substance (no), temperature change (no), gas, sound, or light produced (no), new substance formed (no) – this is a physical change (no reactions or new substances).

Based on this analysis, the changes that are considered physical changes are 2 and 4.

So, the answer is:

2 and 4