Chemical Properties — Unit test

Question 6 • GA-GSE Physical Science A

Suppose that a substance in a beaker is heated over a burner in a science lab. Which observation would most likely indicate that a chemical change has occurred in the substance?

Answer

If the substance is a liquid or solid, an increase in temperature would indicate a chemical change.

If the substance is a liquid, a change of some of the liquid to gaseous form would indicate a chemical change.

If the substance is a solid, a change of some of the solid to liquid form would indicate a chemical change.

If the substance is a liquid or solid, production of an odor would indicate a chemical change.

Explanation

A chemical change forms one or more new substances, and producing a new odor can be evidence that this has happened. Heating a material or changing it from solid to liquid or liquid to gas are physical changes: the substance’s state or temperature changes, but its chemical identity does not. Therefore, “production of an odor” is the best indicator.

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