Pure substances and Mixtures 2024 Review

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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. Examples include elements and compounds.

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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. Mixtures can be homogeneous or heterogeneous.

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What is a homogeneous mixture?

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A homogeneous mixture is a mixture that is uniform in composition and appearance. Examples include saltwater and air.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture that is not uniform in composition and has distinct phases. Examples include salad and sand.

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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 oxygen and gold.

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What is a compound?

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A compound is 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 are examples of heterogeneous mixtures?

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Examples of heterogeneous mixtures include fruit loops, pizza, and Skittles.

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What are examples of homogeneous mixtures?

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Examples of homogeneous mixtures include vinegar, air, and sugar dissolved in water.

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How can you identify a heterogeneous mixture?

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A heterogeneous mixture can be identified by its non-uniform appearance and the presence of distinct components that can be seen or separated.

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How can you identify a homogeneous mixture?

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A homogeneous mixture can be identified by its uniform appearance and the inability to distinguish its components.