Question

gordon adds a piece of solid zinc metal to a beaker of hydrochloric acid. he identifies the products as zinc chloride and hydrogen gas. which process took place in the beaker?

○ a physical change
○ condensation
○ a chemical change
○ evaporation

Explanation:

A chemical change occurs when new substances are formed. In this case, zinc metal reacts with hydrochloric acid to produce zinc chloride (a new compound) and hydrogen gas (a new substance). Physical changes (like condensation or evaporation) do not result in new substances. Condensation is the change of gas to liquid, and evaporation is the change of liquid to gas. Since new substances (zinc chloride and hydrogen gas) are formed here, it is a chemical change.

Answer:

C. a chemical change