Elements, Compounds and Mixtures Review

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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 carbon.

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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. Examples include water (H2O) and ammonia (NH3).

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What is a mixture?

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A mixture is a combination of two or more substances that are not chemically bonded. The individual substances retain their properties. Examples include salad and air.

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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 air and saltwater.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture that does not have a uniform composition and the individual substances can be seen. Examples include salad and sand.

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How can you separate a mixture of sand and water?

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You can separate a mixture of sand and water using filtration. The sand will be trapped in the filter paper while the water passes through.

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What is the difference between a compound and a mixture?

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A compound is made of two or more elements that are chemically bonded, while a mixture is made of two or more substances that are physically combined.

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What is an example of a compound?

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An example of a compound is water (H2O), which is made of hydrogen and oxygen.

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What is an example of an element?

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An example of an element is oxygen (O), which is a basic building block of matter.

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What is air classified as?

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Air is classified as a homogeneous mixture because it has a uniform composition of gases.