Question

select all that apply
select all of the possible examples to show a chemical change occu
changing shape
bubbles form
crystals form
changing state of matter
burning
unexpected color change
measuring density
unexpected temperature change

Explanation:

A chemical change involves the formation of new substances. Bubbles forming can indicate a gas is produced (new substance). Burning results in new substances (e.g., ash, gases). An unexpected color change can signify a new compound formed. An unexpected temperature change (like in an exothermic or endothermic reaction) shows a chemical reaction (new substances with different energy states). Changing shape, changing state of matter, crystals forming (if from physical processes like evaporation of a solution - no new substance), and measuring density (a physical property measurement - no new substance) are physical changes.

Answer:

bubbles form, burning, unexpected color change, unexpected temperature change