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 of the substances to the of the substances. retry

Explanation:

To test the hypothesis about a material losing original properties after a chemical change, one compares the properties of the substances before and after the change.

Answer:

properties before the chemical - change; properties after the chemical - change