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. The individual substances retain their properties. Examples include air and salad.

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How can you classify a substance as a compound?

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A substance is classified as a compound if it consists of two or more different elements that are chemically combined in a fixed ratio.

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What is the difference between a mixture of elements and a mixture of compounds?

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A mixture of elements contains only individual elements (e.g., iron and sulfur), while a mixture of compounds contains different compounds (e.g., salt and sugar).

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What is the chemical formula for water?

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The chemical formula for water is H2O, indicating it is composed of two hydrogen atoms and one oxygen atom.

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What is the significance of chemical symbols?

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Chemical symbols are shorthand representations of elements, used to simplify chemical equations and formulas. For example, 'Na' represents sodium.

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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, such as saltwater or air.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture where the components can be seen and are not uniform, such as a salad or a mixture of sand and salt.

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How do you identify an element in a chemical equation?

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An element in a chemical equation is represented by its chemical symbol, such as H for hydrogen or O for oxygen.