Elements, Compounds, Types of 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, oxygen, and gold.

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What is a compound?

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A compound is a substance formed when two or more elements chemically bond together. Examples include water (H2O) and carbon dioxide (CO2).

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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 has a uniform composition throughout. Examples include salt water and air.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture that does not have a uniform composition. Examples include salad and sand in water.

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

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A pure substance has a constant composition and distinct properties, while a mixture contains two or more substances that retain their individual properties.

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What type of mixture is salt water?

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Salt water is a homogeneous mixture because the salt is evenly distributed throughout the water.

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What type of mixture is milk?

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Milk is considered a homogeneous mixture because it appears uniform, even though it contains fat globules and proteins.

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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). An example is sugar dissolved in water.

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What is a suspension?

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