Pure substances and Mixtures

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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 a homogeneous mixture?

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A homogeneous mixture is a mixture that has a uniform composition throughout. Examples include saltwater and air.

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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 uniformly distributed. Examples include salad and pizza.

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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. Example: Sodium chloride (table salt).

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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 and oxygen.

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How can mixtures be separated?

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Mixtures can be separated using physical methods such as filtration, distillation, or centrifugation.

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What is an example of a heterogeneous mixture?

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An example of a heterogeneous mixture is pizza with pepperoni and anchovies.

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What is an example of a homogeneous mixture?

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An example of a homogeneous mixture is coffee with milk and sugar.

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What type of matter is salt classified as?

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Salt is classified as a compound because it is made of sodium and chlorine atoms chemically bonded together.