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 2
1 and 2
2 and 3
2 and 3
1 and 4
1 and 4
2 and 4
2 and 4
The physical changes shown in the table are 2 and 4.
To determine which changes shown in the table are physical changes, we need to understand the characteristics of a physical change.
A physical change refers to a change in which the form of matter is altered, but the substance itself remains the same. In a physical change, there is no new substance formed.
Let's analyze the observations given in the table:
Change #1:
- Reacts with another substance? Yes
- Temperature change? Yes
- Gas, sound, or light produced? Yes
- New substance formed? Yes
Based on the fact that a new substance is formed, Change #1 is a chemical change rather than a physical change.
Change #2:
- Reacts with another substance? No
- Temperature change? Yes
- Gas, sound, or light produced? Yes
- New substance formed? No
In this case, there is no new substance formed. Therefore, Change #2 is a physical change.
Change #3:
- Reacts with another substance? Yes
- Temperature change? Yes
- Gas, sound, or light produced? Yes
- New substance formed? Yes
Similar to Change #1, a new substance is formed in Change #3, making it a chemical change.
Change #4:
- Reacts with another substance? No
- Temperature change? No
- Gas, sound, or light produced? No
- New substance formed? No
Change #4 does not involve any of the characteristics associated with a chemical change. Therefore, Change #4 is a physical change.
Based on our analysis, the physical changes shown in the table are Changes #2 and #4. So the correct answer is "2 and 4."