Question

Check all of the indicators that a chemical change has occurred:

change in shape, but substance is the same
change in state of matter
unexpected color change
expected color change
formation of a precipitate
change in odor
unexpected change in temperature
bubbles form

Answer 1

Chemical changes are evident through unexpected color changes, formation of a precipitate, changes in odor, unexpected changes in temperature, and bubbles formed without boiling.

Step-by-step explanation:

The question asks us to check the indicators that show a chemical change has occurred. Not all changes indicate a chemical reaction; some may simply be physical changes.

For instance, a change in shape or state of matter often indicates a physical change. However, specific changes such as an unexpected color change, formation of a precipitate, change in odor, unexpected change in temperature, and the formation of bubbles (when the substance isn't boiling) are clear signs that a chemical reaction has taken place. On the other hand, an expected color change might not necessarily be an indicator of a chemical change, as it could be the result of a physical mixture.