chemical and Physical Change

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances with different properties.

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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.

Front

What is an example of a chemical change?

Back

Exploding fireworks is an example of a chemical change because it produces new substances.

Front

What is an example of a physical change?

Back

Melting wax is an example of a physical change because the wax changes state but remains the same substance.

Front

Why is it important to record properties before and after mixing substances?

Back

It helps to determine if a new substance has formed and to compare the properties of the mixtures.

Front

What does it mean if the properties of substances change when mixed?

Back

It indicates that a chemical change may have occurred, suggesting that a new substance has formed.

Front

What should remain constant in an experiment to test chemical changes?

Back

The substances that are combined in each experiment should be the same.

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What is evidence that a new substance has formed?

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If the resulting substance has different properties or is heavier than the original substances, it indicates a new substance has formed.

Front

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

Back

The mass is conserved; the total mass of the reactants equals the total mass of the products.

Front

What is a reactant?

Back

A reactant is a substance that is present at the start of a chemical reaction.