Question

hypothesis: if a material undergoes a chemical change, then it will not retain its original properties because a new substance is formed. to test the hypothesis above, you will observe the changes during the experiment. to do this, you will use these observations to compare the initial appearance of the substances to the final appearance of the substances. according to the lab guide, which changes below will you look for in order to test the hypothesis? check all that apply. changes in shape or size color changes whether changes are easily reversible temperature changes formation of precipitates or gases changes of state (gas, liquid, or solid)

Explanation:

Color changes, whether changes are easily reversible, temperature changes, formation of precipitates or gases are signs of chemical changes. Changes in shape or size and changes of state are physical changes.

Answer:

color changes
whether changes are easily reversible
temperature changes
formation of precipitates or gases