Quick Check #1 2025-Pure Substances and Mixtures

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What is a pure substance?

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A material that has a constant composition and cannot be separated into simpler substances by physical means.

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What is a compound?

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A pure substance made up of two or more different elements that are chemically bonded together.

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What is an element?

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A pure substance that consists of only one type of atom and cannot be broken down into simpler substances.

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What is a mixture?

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A combination of two or more substances that are not chemically bonded and can be separated by physical means.

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What is a homogeneous mixture?

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A mixture that has a uniform composition throughout, meaning the individual components are not distinguishable.

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What is a heterogeneous mixture?

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A mixture that has a non-uniform composition, where the individual components can be seen and separated.

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What is the difference between a pure substance and a mixture?

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A pure substance has a fixed composition and distinct properties, while a mixture can vary in composition and can be separated physically.

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Can mixtures be separated?

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

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What is a solution?

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A homogeneous mixture where one substance (the solute) is dissolved in another (the solvent).

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What is an atom?

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The smallest unit of an element that retains the properties of that element.