Elements, Compounds, & Mixtures

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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 combined. Examples include air, salad, and sand.

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What is an element?

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An element is a pure substance that consists of only one type of atom. 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 are chemically bonded together. Examples include water (H2O) and carbon dioxide (CO2).

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What is matter?

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Matter is anything that has mass and takes up space.

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What is an example of a homogeneous mixture?

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An example of a homogeneous mixture is saltwater, where the salt is evenly distributed throughout the water.

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What is an example of a heterogeneous mixture?

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An example of a heterogeneous mixture is a salad, where the different ingredients can be seen and separated.

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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 that are chemically combined, while a mixture is made of two or more substances that are physically combined.

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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 the chemical formula for water?

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The chemical formula for water is H2O, which indicates it is made of two hydrogen atoms and one oxygen atom.

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What is an atom?

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An atom is the smallest unit of an element that retains the properties of that element.