Elements Compounds and Elements

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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 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 gold (Au) and oxygen (O).

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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 in fixed proportions. 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. The components can be separated by physical means. Examples include salad and air.

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What is the definition of matter?

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Matter is anything that has mass and takes up space.

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What are the two main categories of pure substances?

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The two main categories of pure substances are elements and compounds.

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Can a mixture be a pure substance?

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No, a mixture is not a pure substance because it contains two or more different substances that are not chemically combined.

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What is an example of a pure element?

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An example of a pure element is gold (Au), which consists only of gold atoms.

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What is an example of a pure compound?

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An example of a pure compound is sodium chloride (NaCl), which consists of sodium and chloride ions.

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How can you identify a mixture?

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A mixture can be identified by the presence of two or more substances that retain their individual properties and can be separated by physical means.