Compounds, Mixtures, Elements

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What is a compound?

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A compound is a substance formed when two or more elements are chemically bonded together. Examples include water (H2O) and sodium chloride (NaCl).

Tags

NGSS.MS-PS1-1

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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 (uniform composition) or heterogeneous (distinct, separate components).

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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. An example is Kool-Aid, where the solute is evenly distributed in the solvent.

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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. An example is salsa, which contains visible chunks of different ingredients.

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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 (O) and magnesium (Mg).

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What is the difference between a compound and a mixture?

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A compound is made of two or more elements chemically combined, while a mixture is made of two or more substances that are physically combined but not chemically bonded.

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What does it mean for a substance to be chemically combined?

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Chemically combined means that the atoms of different elements are bonded together through chemical reactions, forming a new substance with different properties.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

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Can compounds be separated into their components?

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Compounds can only be separated into their components through chemical reactions, while mixtures can be separated by physical means.

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What is the chemical formula for potassium chloride?

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The chemical formula for potassium chloride is KCl.

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What is the chemical formula for water?

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The chemical formula for water is H2O.

Tags

NGSS.MS-PS1-1