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 substance 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 are not uniform and can be easily distinguished. Examples include salad and pizza.

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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 carbon (C).

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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 sodium chloride (NaCl).

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Give an example of a heterogeneous mixture.

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Fruit Loops, pizza, and Skittles are examples of heterogeneous mixtures.

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Give an example of a homogeneous mixture.

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Coffee, mouthwash, and vinegar are examples of homogeneous mixtures.

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What is the difference between a pure substance and a mixture?

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

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What is the main characteristic of 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).