Pure Substances and Mixtures Flashcard

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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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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 oxygen (O) and gold (Au).

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What is a compound?

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A compound is a pure substance formed when two or more elements chemically combine in fixed proportions. 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 in which the components are evenly distributed and not easily distinguishable. An example is saltwater.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture where the components are not evenly distributed, and individual substances can be seen. An example is a salad.

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What is a solution?

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A solution is a type of homogeneous mixture where one substance (the solute) is dissolved in another (the solvent). An example is sugar dissolved in water.

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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 but can settle over time. An example is muddy water.

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What does it mean for a mixture to be 'well mixed'?

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A well-mixed mixture means that the different components are combined so thoroughly that they cannot be easily separated. This is characteristic of homogeneous mixtures.

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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 chemically bonded together, while a mixture is a physical combination of substances that retain their individual properties.