Physical and Chemical Properties and 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. Examples include rusting, burning, and digestion.

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What happens during rusting?

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Rusting is a chemical change where iron reacts with oxygen and moisture in the environment to form iron oxide, commonly known as rust.

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Is hammering wood together a physical or chemical change?

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Hammering wood together is a physical change because it does not change the chemical composition of the wood.

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What is density?

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Density is the mass of a substance divided by its volume, often expressed in grams per cubic centimeter (g/cm³). It indicates how much matter is packed into a given space.

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What is an example of a physical change?

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An example of a physical change is ice melting into water.

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What is an example of a chemical change?

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An example of a chemical change is baking a cake, where ingredients react to form a new substance.

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What is a precipitate?

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

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What is the difference between a physical and chemical change?

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A physical change does not produce a new substance, while a chemical change results in the formation of one or more new substances.

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What is an indicator of a chemical change?

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Indicators of a chemical change include color change, temperature change, gas production, and the formation of a precipitate.