00:01
For this question, you're simply asked to identify which of the following observations is our consistent with a chemical reaction.
00:10
The first one says propane, so more than one answer is possible.
00:20
Propane forms a flame and emits heat as it burns.
00:24
The fact that they're stating that it burns, that suggests a chemical reaction.
00:29
And the next statement says acetone feels cold as it evaporates.
00:47
This is not a chemical reaction.
00:50
When something evaporates, it just goes into the gas phase, but it stays, in this case, as acetone.
00:56
For a chemical reaction, we need to form a new substance.
01:00
C says bubbling occurs when potassium carbonate and hydrochloric acid are mixed...