Pure Substance and Mixture Review

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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 substance retains its own properties. Mixtures can be homogeneous or heterogeneous.

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Define homogeneous mixture.

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A homogeneous mixture is a mixture in which the components are uniformly distributed and the same throughout, such as saltwater.

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Define heterogeneous mixture.

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A heterogeneous mixture is a mixture in which the components are not uniformly distributed, such as a salad.

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What are elements?

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Elements are pure substances that cannot be broken down into simpler substances by chemical means. They are the building blocks of matter.

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What are compounds?

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Compounds are pure substances formed when two or more elements chemically combine in fixed proportions, such as water (H2O).

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What is the difference between an atom and a molecule?

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An atom is the smallest unit of an element, while a molecule is a group of two or more atoms bonded together.

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What is a colloid?

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A colloid is a type of heterogeneous mixture where very small particles of one substance are dispersed in another, such as milk.

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What is a suspension?

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A suspension is a heterogeneous mixture in which solid particles are suspended in a liquid or gas, such as muddy water.

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How is matter classified?

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Matter is classified into pure substances (elements and compounds) and mixtures (homogeneous and heterogeneous).