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. It consists of only one type of atom.

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What is a compound?

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A compound is a substance formed when two or more different elements are chemically bonded together. For example, water (H2O) is a compound made of hydrogen and oxygen.

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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 combined. Each substance retains its own properties.

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What are atoms?

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Atoms are the smallest units of matter that make up all substances. They consist of protons, neutrons, and electrons.

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What are the blue numbers in a chemical formula called?

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The blue numbers are called subscripts, which indicate the number of atoms of each element in a compound.

Front

What is the chemical formula for salt?

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The chemical formula for salt is NaCl, which indicates it is a compound made of sodium (Na) and chlorine (Cl).

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What is the difference between a compound and a mixture?

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A compound is a substance formed from two or more elements that are chemically bonded, while a mixture is a combination of substances that are not chemically bonded.

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Can elements be broken down into simpler substances?

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No, elements cannot be broken down into simpler substances by chemical means.

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What is a molecule?

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A molecule is the smallest unit of a chemical compound that retains the properties of that compound, formed by the chemical bonding of two or more atoms.

Front

What is the significance of coefficients in a chemical equation?

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Coefficients indicate the number of molecules or moles of a substance involved in a chemical reaction.