Interim Review

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What is a Pure Substance?

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A material that has a constant composition and consistent properties throughout. Examples include elements and compounds.

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What is a Mixture?

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A combination of two or more substances where each retains its own properties. Examples include air and salad.

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What is an Element?

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A pure substance that cannot be broken down into simpler substances by chemical means. Examples include hydrogen and oxygen.

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What is a Compound?

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A substance formed when two or more elements are chemically bonded together. Examples include water (H2O) and carbon dioxide (CO2).

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What is the nucleus of an atom?

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The central part of an atom that contains protons and neutrons.

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What are Protons?

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Positively charged particles found in the nucleus of an atom.

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What are Neutrons?

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Neutral particles found in the nucleus of an atom that do not have an electric charge.

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What are Electrons?

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Negatively charged particles that orbit the nucleus of an atom.

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What is the difference between a Pure Substance and a Mixture?

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A pure substance has a uniform and definite composition, while a mixture contains two or more substances that retain their individual properties.

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What is a Homogeneous Mixture?

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A mixture that has a uniform composition throughout, such as saltwater.