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 consistent properties throughout. Examples include elements and compounds.

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What is a Mixture?

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A combination of two or more substances that retain their individual properties. Mixtures can be homogeneous or heterogeneous.

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What is an Element?

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A pure substance that cannot be broken down into simpler substances by chemical means. Examples include hydrogen, oxygen, and gold.

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What is a Compound?

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A pure 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 Homogeneous Mixture?

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A mixture that has a uniform composition throughout. Examples include saltwater and air.

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What is a Heterogeneous Mixture?

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A mixture that consists of visibly different substances or phases. Examples include salad and chicken noodle soup.

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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 contains two or more substances that can vary in composition.

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What is an example of a Homogeneous Mixture?

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An example is vinegar, which is a uniform solution of acetic acid in water.

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What is an example of a Heterogeneous Mixture?

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An example is a fruit salad, where the individual fruits can be seen and separated.

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What is the process of separating mixtures called?

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Separation techniques such as filtration, distillation, and chromatography are used to separate mixtures.