Which of the following would indicate that a chemical change might be occurring

The options are missing in the question, so I am going to answer it in a general way.

There are several indicators of chemical reactions. They are:

Depending of what kind of reaction is occurring which indicator appear. For example in combustion reactions the temperature increase because they are highly exothermic; and in electrolysis of water, bubbles of molecular oxygen and molecular hydrogen are generated.

explanation:

0.07 g/cm³

1.37 g/cm³