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Use the table of observed changes to answer the question.

Indicators of Chemical Versus Physical Changes
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 2
1 and 2

1 and 4
1 and 4

2 and 3
2 and 3

2 and 4
2 and 4

1 answer

Physical changes are characterized by changes that do not alter the chemical composition of a substance. According to the table:

  • Change #1: Reacts with another substance? Yes (chemical change)
  • Change #2: Reacts with another substance? No (physical change)
  • Change #3: Reacts with another substance? Yes (chemical change)
  • Change #4: Reacts with another substance? No (physical change)

Based on this information, the changes that are considered physical changes are Change #2 and Change #4.

Therefore, the correct response is:

2 and 4