Use the table of observed changes to answer the question.

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 4
1 and 4

1 and 2

help

Answer 1

To determine which changes are physical changes, we need to identify the characteristics of physical changes. Physical changes are processes that do not create a new substance, even if they involve changes in state, temperature, or appearance.

From the table:

• Change #1: Reacts with another substance? yes (chemical), Temperature change? yes, Gas, sound, or light produced? yes, New substance formed? yes → Not a physical change
• Change #2: Reacts with another substance? no (indicates physical), Temperature change? yes, Gas, sound, or light produced? yes, New substance formed? no → Physical change
• Change #3: Reacts with another substance? yes (chemical), Temperature change? yes, Gas, sound, or light produced? yes, New substance formed? yes → Not a physical change
• Change #4: Reacts with another substance? no (indicates physical), Temperature change? no, Gas, sound, or light produced? no, New substance formed? no → Physical change

Based on this analysis, changes #2 and #4 are physical changes.

So, the correct answer is: 2 and 4.