Chemical and Physical Changes

Front

What is a chemical change?

Back

A chemical change occurs when the atoms in the reactants rearrange themselves and bond together differently to form one or more new products with different characteristics than the reactants.

Front

What is a physical change?

Back

A physical change is a change that occurs when objects or substances undergo a transformation that does not change them into a different substance.

Front

What happens to the weight of matter during a chemical change?

Back

The weight of matter stays the same during a chemical change.

Front

What is an example of a physical change?

Back

An example of a physical change is ice melting.

Front

If you mix 1 gram of salt with 50 grams of water, what is the total weight of the mixture?

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The total weight of the mixture will be 51 grams.

Front

What is the law of conservation of mass?

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The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; it remains constant.

Front

What are reactants in a chemical reaction?

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Reactants are the starting substances that undergo a chemical change to form products.

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What are products in a chemical reaction?

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Products are the substances that are formed as a result of a chemical reaction.

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Can a physical change be reversed?

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Many physical changes can be reversed, such as freezing and melting.

Front

What is an example of a chemical change?

Back

An example of a chemical change is the rusting of iron.