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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 Oxygen (O) and Carbon (C).

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What is matter?

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Matter is anything that has mass and occupies space.

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What is a pure substance?

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A pure substance is a material made up of only one type of atom (element) or one type of molecule (compound).

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What is a chemical change?

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A chemical change is a process where substances combine or break apart to form new substances, such as rust forming on iron.

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How can matter be classified?

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All matter can be classified as pure substances or mixtures.

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What is a mixture?

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A mixture is a combination of two or more substances where each retains its own properties. Examples include saltwater and air.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture in which the components are not uniformly distributed, such as salad or sand and iron filings.

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What is a homogeneous mixture?

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A homogeneous mixture is a mixture in which the components are uniformly distributed, such as sugar dissolved in water.

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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, such as water (H2O) or carbon dioxide (CO2).

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What is the difference between an element and a compound?

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An element is a pure substance made of one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.