Evidence of Chemical Reactions

Front

What is a chemical reaction?

Back

A process where substances (reactants) undergo a transformation to form new substances (products) with different properties.

Front

What are reactants in a chemical reaction?

Back

Substances that undergo change during a chemical reaction.

Front

What are products in a chemical reaction?

Back

New substances formed as a result of a chemical reaction.

Front

What is evidence of a chemical reaction?

Back

Indicators such as color change, gas production, formation of a precipitate, or temperature change that suggest a chemical change has occurred.

Front

What is a precipitate?

Back

A solid that forms and settles out of a liquid mixture during a chemical reaction.

Front

What does the Law of Conservation of Mass state?

Back

Mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

Front

What is an example of a physical change?

Back

Melting ice into water; the substance remains the same (H2O) but changes state.

Front

What is an example of a chemical change?

Back

Burning sugar, which produces new substances (carbon and water) and releases energy.

Front

What is a chemical equation?

Back

A symbolic representation of a chemical reaction, showing the reactants and products.

Front

What does it mean when a substance changes color during a reaction?

Back

It often indicates that a new substance has formed, suggesting a chemical reaction has occurred.