Chemistry: Classification of Matter

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What is the definition of 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.

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What is the definition of a chemical change?

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A chemical change is a change that results in the formation of new chemical substances, involving a rearrangement of atoms.

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What is a compound?

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A compound is a substance formed when two or more elements are chemically bonded together.

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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.

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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 and can be separated by physical means.

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What is an example of a physical change?

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An example of a physical change is melting ice.

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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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How can you identify a chemical change?

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

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What is the difference between a homogeneous mixture and a heterogeneous mixture?

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A homogeneous mixture has a uniform composition throughout, while a heterogeneous mixture has a non-uniform composition.

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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.