Chemical and Physical Change

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What is a Physical Change?

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A change that affects one or more physical properties of a substance without altering its chemical composition.

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What is a Chemical Change?

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A change that results in the formation of new chemical substances, altering the chemical composition of the original substance.

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Example of a Physical Change: Ice melting into water.

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This is a physical change because the chemical composition of water (H2O) remains the same.

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Example of a Chemical Change: Iron rusting.

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This is a chemical change because it forms a new substance (iron oxide) from iron and oxygen.

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What is a Catalyst?

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A substance that increases the rate of a chemical reaction without being consumed in the process.

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What is a Reactant?

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A substance that undergoes a chemical change in a reaction.

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What is a Product?

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A substance that is formed as a result of a chemical reaction.

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What is a Molecule?

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A group of two or more atoms bonded together, representing the smallest fundamental unit of a chemical compound.

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What happens during a Physical Change?

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The form of a substance changes, but its chemical identity remains the same.

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What happens during a Chemical Change?

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The original substances are transformed into one or more new substances with different properties.