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 4
1 and 4

1 and 2
1 and 2

2 and 3
2 and 3

2 and 4

1 answer

To identify physical changes from the table, we need to look for changes where there is no reaction with another substance, no formation of a new substance, and no other indicators of a chemical change such as gas, sound, or light production.

From the provided table:

  • Change 1: Reacts with another substance? yes (indicates a chemical change)
  • Change 2: Reacts with another substance? no (this may indicate a physical change)
  • Change 3: Reacts with another substance? yes (indicates a chemical change)
  • Change 4: Reacts with another substance? no (this may indicate a physical change)

Looking at the criteria for physical changes:

  • Change 2 has no reaction with another substance, but has a temperature change and produces gas or sound, which typically suggests that it's not just a physical change.
  • Change 4 has no reaction, no temperature change, no gas, sound, or light produced, and no new substance formed, which suggests that it is a physical change.

Based on this, the only physical change in the given options is change 4.

Therefore, the correct choice indicating physical changes is:

2 and 4