Pure Substances and Mixtures

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What is a pure substance?

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A pure substance is a material that has a constant composition and consistent properties throughout. It can be an element or a compound.

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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. Mixtures can be homogeneous or heterogeneous.

Front

What is the difference between an element and a compound?

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An element is a pure substance that cannot be broken down into simpler substances, while a compound is made up of two or more different elements chemically bonded together.

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What is a homogeneous mixture?

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A homogeneous mixture is a mixture that has a uniform composition and appearance throughout, such as saltwater.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture where the components are not uniformly distributed, and different parts can be seen, such as a salad.

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Can compounds be separated into their elements?

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Yes, compounds can be separated into their elements through chemical reactions.

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What is an example of a compound?

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An example of a compound is water (H2O), which is made up of hydrogen and oxygen.

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What is an example of an element?

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An example of an element is oxygen (O), which cannot be broken down into simpler substances.

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What is the law of definite proportions?

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The law of definite proportions states that a chemical compound always contains its component elements in fixed ratio by mass.

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What is a solution?

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A solution is a homogeneous mixture of two or more substances, where one substance (the solute) is dissolved in another (the solvent).