Physical and Chemical Changes

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What is a Chemical Change?

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A process where substances combine or break apart to form new substances, often accompanied by energy changes.

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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 Mixture?

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A combination of two or more substances where each retains its own properties and can be separated by physical means.

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What is a sign of a Chemical Change?

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Formation of a gas, change in color, temperature change, or formation of a precipitate.

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What is a sign of a Physical Change?

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Change in shape, size, or state of matter without forming a new substance.

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Example of a Chemical Change?

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Burning wood, where new substances (ash, smoke) are formed.

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Example of a Physical Change?

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Melting ice, where water changes state but remains H2O.

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What happens during a Chemical Reaction?

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Bonds between atoms are broken and new bonds are formed, resulting in new substances.

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What is the Law of Conservation of Mass?

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In a chemical reaction, mass is neither created nor destroyed; it remains constant.

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What is a Reactant?

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A substance that undergoes a chemical change in a reaction.