Identify Physical and Chemical Changes

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What is a physical change?

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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.

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What is a chemical change?

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A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and the rearrangement of atoms. Examples include burning, rusting, and souring of milk.

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What are indicators of a chemical change?

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Indicators of a chemical change include color change, temperature change, gas production (bubbles), formation of a precipitate, and change in odor.

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Is melting a chocolate bar a physical or chemical change?

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Melting a chocolate bar is a physical change.

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What happens during a chemical change?

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During a chemical change, the bonds between atoms are broken and new bonds are formed, resulting in new substances.

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What is an example of a physical change?

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An example of a physical change is breaking a pencil.

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What is an example of a chemical change?

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An example of a chemical change is burning wood.

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What is the difference between a physical change and a chemical change?

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A physical change does not alter the chemical composition of a substance, while a chemical change results in the formation of new substances.

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What is rusting?

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

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What is the significance of observing gas production in a reaction?

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Gas production during a reaction is often an indicator of a chemical change, suggesting that new substances are being formed.