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 changing its chemical composition. Examples include changes in size, shape, or state of matter.

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What is a chemical change?

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A chemical change occurs when substances combine or break apart to form new substances with different properties. Examples include burning, rusting, and cooking.

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What happens during a chemical change?

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During a chemical change, the molecules of one substance are rearranged to form different substances.

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What is an example of a chemical change?

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Burning wood is an example of a chemical change because it transforms the wood into ash and smoke.

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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, which is commonly known as rust.

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What is the difference between physical and chemical changes?

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Physical changes do not create new substances, while chemical changes do create new substances.

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What is an example of a physical change?

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Cutting paper is an example of a physical change because the paper remains paper, just in smaller pieces.

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What is the law of conservation of mass?

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The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of the reactants equals the total mass of the products.

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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.

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What happens to steel wool when it rusts?

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When steel wool rusts, it turns red and brittle due to the formation of iron oxide.