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. Examples include air and salad.

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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 that are physically combined but not chemically bonded.

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What is a nonmetal?

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Nonmetals are elements that are typically poor conductors of heat and electricity. Examples include sulfur (S), oxygen (O), and nitrogen (N).

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What is a metal?

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Metals are elements that are good conductors of heat and electricity, typically shiny and malleable. Examples include iron (Fe), copper (Cu), and aluminum (Al).

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What is the chemical formula for sugar?

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The chemical formula for sugar is C12H22O11.

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What is air classified as?

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Air is classified as a mixture because it contains various gases, including nitrogen, oxygen, and carbon dioxide, that are not chemically bonded.

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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. An example is 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 different components can be seen. An example is a salad.