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 carbon (C).

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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. An example is water (H2O), which is 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 bonded. The individual substances retain their properties.

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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. An example is salt water.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture where the components are not uniform and can be easily distinguished. An example is a salad.

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What is a solution?

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A solution is a type of homogeneous mixture where one substance (the solute) is dissolved in another (the solvent). For example, sugar dissolved in water.

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What is a colloid?

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A colloid is a mixture where small particles of one substance are evenly distributed throughout another substance. An example is milk.

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What is a suspension?

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A suspension is a heterogeneous mixture where solid particles are suspended in a liquid but will settle over time. An example is muddy water.

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What is the difference between a compound and a mixture?

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A compound is made of two or more elements chemically bonded together, while a mixture is a physical combination of substances that can be separated.

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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 made of two hydrogen atoms and one oxygen atom.