Pure Substances vs. 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 properties throughout. It can be an element or a compound.

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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. 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 is uniform in composition and appearance throughout, such as saltwater.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture that is not uniform in composition and has distinct phases, such as a salad.

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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.

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What is a compound?

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A compound is a pure substance formed when two or more elements are chemically bonded together, such as water (H2O).

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Can a mixture be separated into its components?

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Yes, mixtures can be separated into their individual components by physical means, such as filtration or distillation.

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What is an example of a pure substance?

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An example of a pure substance is gold (Au), which is an element.

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What is an example of a mixture?

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An example of a mixture is air, which contains various gases like nitrogen, oxygen, and carbon dioxide.

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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 consists of two or more substances that retain their individual properties.