Pure Substances & Mixtures Test 2025

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What is a pure substance?

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A pure substance is 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 mixture is a combination of two or more substances where each retains its own properties. Mixtures can be homogeneous or heterogeneous.

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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 gold.

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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. Examples include water (H2O) and carbon dioxide (CO2).

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What is a homogeneous mixture?

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A homogeneous mixture is a mixture that has a uniform composition throughout. An example is salt water.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture where the components can be seen and are not uniform throughout. An example is a salad.

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What is an example of a pure substance?

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An example of a pure substance is a balloon filled with helium.

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What is an example of a mixture?

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An example of a mixture is salt water.

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What happens when two elements combine chemically?

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When two elements combine chemically, they form a compound.

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What is the difference between a compound and a mixture?

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A compound is a substance formed from two or more elements that are chemically bonded, while a mixture is a combination of substances that are not chemically bonded.