Chemical vs Physical 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 includes processes like rusting, burning, and cooking.

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What happens to the mass of a substance during a physical change?

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The mass of a substance remains the same during a physical change, as no new substances are formed.

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What happens to the mass of a substance during a chemical change?

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The mass of a substance is conserved during a chemical change, but it may change forms as new substances are created.

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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 (rust).

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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 a firework exploding, which produces gas, heat, and light.

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What is a compound?

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A compound is a substance formed when two or more elements chemically bond together. For example, water (H2O) is a compound made of hydrogen and oxygen.

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What is an element?

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An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include hydrogen, oxygen, and iron.

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What is a mixture?

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A mixture is a combination of two or more substances that are not chemically bonded. Mixtures can be homogeneous (uniform composition) or heterogeneous (distinct parts).