Properties of Matter — Test

Question 4 • Physical Science

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, production of an odor 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, an increase in temperature would indicate a chemical change.

Explanation

A change in state, such as liquid evaporating or a solid melting, is a physical change because the substance’s identity stays the same. An increase in temperature alone is also not evidence of a chemical change. The production of a new odor can indicate that a new substance formed, so choice D is the best indicator of a chemical change.

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