Change # Reacts with another substance? Temperature change? Gas, sound, or light produced? New substance formed?

Question

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 3

1 and 2
1 and 2

1 and 4
1 and 4

2 and 4

Answer 1

To identify which changes are physical changes, we need to understand the characteristics of physical changes versus chemical changes:

• Physical changes: Do not involve a change in the chemical composition of a substance. They often involve changes in physical properties such as state, shape, or temperature, but they do not produce new substances.
• Chemical changes: Involves a change in the chemical composition of a substance, often characterized by the production of new substances, a temperature change, a gas, sound, or light.

Based on the table:

• 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 is a physical change (the property changes, but no new substance is formed).
• 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.

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

Thus, the correct response is: 2 and 4.