Chemistry/Matter Unit Test

Front

What does the Law of Conservation of Mass state?

Back

The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction; it only changes forms.

Front

What happens to atoms during a chemical reaction?

Back

Atoms rearrange to form new substances.

Front

What is a physical property?

Back

A physical property is a characteristic of a substance that can be observed or measured without changing its identity, such as color, melting point, or density.

Front

Give an example of a physical change.

Back

Melting ice cubes into water is an example of a physical change.

Front

What is the relationship between molecular speed and temperature?

Back

The speed of molecules determines the temperature; higher speeds correspond to higher temperatures.

Front

What is a chemical change?

Back

A chemical change results in the formation of new substances and involves a change in the chemical composition.

Front

What is an example of a chemical change?

Back

Baking cupcakes is an example of a chemical change.

Front

What is energy's role in chemical reactions?

Back

Energy is needed to break bonds in chemical reactions.

Front

What happens to the mass of reactants and products in a chemical reaction?

Back

The total mass of reactants equals the total mass of products.

Front

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

Back

A physical change does not alter the substance's chemical identity, while a chemical change does.