Elements, Compounds, and Mixtures

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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 (H), oxygen (O), and gold (Au).

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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 carbon dioxide (CO2).

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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 and can be separated by physical means. Examples include air and salad.

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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 vinegar.

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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 a salad and a compost pile.

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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 chemically combined, while a mixture consists of two or more substances physically combined.

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Can compounds be separated into their elements?

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Yes, compounds can be separated into their elements through chemical reactions.

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Can mixtures be separated?

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Yes, mixtures can be separated by physical methods such as filtration, distillation, or evaporation.

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What is an example of a compound?

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Water (H2O) is an example of a compound, consisting of hydrogen and oxygen.

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What is an example of a homogeneous mixture?

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An example of a homogeneous mixture is air, which is a mixture of gases that is uniform throughout.