Front

What is evidence of a chemical change?

Back

Evidence of a chemical change includes changes in color, temperature, the production of gas, the formation of a precipitate, and the release of light or heat.

Front

Which example shows a chemical reaction has occurred?

Back

Rust forming on a hammer left outside is evidence of a chemical reaction.

Front

What are reactants in a chemical equation?

Back

Reactants are the substances that undergo a chemical change, found on the left side of a chemical equation.

Front

What does the formation of bubbles indicate in a chemical reaction?

Back

The formation of bubbles may indicate that a gas is being produced as a result of a chemical reaction.

Front

What is NOT evidence of a chemical reaction?

Back

Melting is NOT evidence of a chemical reaction; it is a physical change.

Front

What is a precipitate?

Back

A precipitate is a solid that forms from a solution during a chemical reaction.

Front

What does it mean if a chemical reaction produces light or heat?

Back

The production of light or heat indicates that a chemical reaction is occurring, often releasing energy.

Front

What is the significance of color change in a chemical reaction?

Back

A color change can indicate that a new substance has formed during a chemical reaction.

Front

What is the role of catalysts in chemical reactions?

Back

Catalysts speed up chemical reactions without being consumed in the process.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance without changing its identity, while a chemical change results in the formation of new substances.