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. 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 in a fixed ratio.

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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.

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What distinguishes a compound from a mixture?

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A compound has a fixed composition and specific properties, while a mixture retains the individual properties of its components and can vary in composition.

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What is an example of an element?

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Oxygen (O) is an example of an element.

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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 mixture?

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Salad is an example of a mixture, as it contains various ingredients that are not chemically combined.

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How can mixtures be separated?

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

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What is the difference between homogeneous and heterogeneous mixtures?

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Homogeneous mixtures have a uniform composition throughout (e.g., saltwater), while heterogeneous mixtures have distinct, separate components (e.g., salad).

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What is the significance of the chemical formula in compounds?

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The chemical formula indicates the types and numbers of atoms in a compound, providing information about its composition.