Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting, freezing, and dissolving.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and changes the composition of the original substance.

Front

What happens to the mass of a substance during a physical change?

Back

The mass of a substance remains the same during a physical change because no new substances are formed.

Front

What happens to the mass of a substance during a chemical change?

Back

The mass of a substance is conserved during a chemical change; however, it may appear to change due to the formation of new substances.

Front

What is an example of a physical change?

Back

Examples of physical changes include melting ice, boiling water, and chopping wood.

Front

What is an example of a chemical change?

Back

Examples of chemical changes include burning wood, rusting iron, and baking a cake.

Front

What is needed for a chemical change to occur?

Back

A chemical change often requires energy, such as heat, light, or electricity, to break and form chemical bonds.

Front

How can you tell if a chemical change has occurred?

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Signs of a chemical change include color change, gas production, temperature change, and the formation of a precipitate.

Front

What is the definition of a solid?

Back

A solid is a state of matter that has a definite shape and volume, and it holds its shape without needing a container.

Front

What is the definition of a liquid?

Back

A liquid is a state of matter that has a definite volume but takes the shape of its container.