Physical & Chemical Properties & Changes

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What is a chemical change?

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A process where one or more substances are transformed into new substances with different properties.

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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 are indicators of a chemical change?

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Unexpected color change, temperature change, gas production, and formation of a precipitate.

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What happens during combustion?

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A chemical change where a substance reacts with oxygen, producing heat and light, often resulting in new substances like ash.

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What is rusting?

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A chemical change that occurs when iron reacts with oxygen and moisture, forming iron oxide (rust).

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What is the difference between a physical and chemical property?

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Physical properties can be observed without changing the substance's identity, while chemical properties can only be observed during a chemical change.

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What is an example of a physical change?

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Melting ice into water.

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What is an example of a chemical change?

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Baking a cake, where ingredients react to form a new substance.

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What does it mean for a substance to dissolve?

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A physical change where a solute mixes with a solvent to form a solution, but the chemical identity of the solute remains unchanged.

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What is a precipitate?

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A solid that forms and settles out of a liquid mixture during a chemical reaction.