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. Examples include burning, rusting, and cooking.

Front

Is mowing the lawn a physical or chemical change?

Back

Mowing the lawn is a physical change because it alters the appearance of the grass without changing its chemical structure.

Front

What happens during a chemical change?

Back

During a chemical change, the atoms in the reactants rearrange to form new substances with different properties.

Front

Is fireworks exploding a physical or chemical change?

Back

Fireworks exploding is a chemical change because it involves a chemical reaction that produces new substances and energy.

Front

Is frying an egg a physical or chemical change?

Back

Frying an egg is a chemical change because it changes the structure of the proteins in the egg, resulting in a new substance.

Front

Is melting ice cream a physical or chemical change?

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Melting ice cream is a physical change because it changes the state of the ice cream from solid to liquid without changing its chemical composition.

Front

What is rusting?

Back

Rusting is a chemical change that occurs when iron reacts with oxygen and moisture in the air, forming iron oxide (rust).

Front

Can physical changes be reversed?

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Many physical changes can be reversed, such as freezing and melting, but some may not be easily reversible.

Front

Can chemical changes be reversed?

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Chemical changes are often not easily reversible, as they result in the formation of new substances.