Elements, Compounds and 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 cookie dough ice cream.

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What is a compound?

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

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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 (H), oxygen (O), and gold (Au).

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What is the difference between a mixture and a compound?

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A mixture is made of two or more substances that are not chemically bonded, while a compound consists of two or more atoms that are chemically bonded.

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Can mixtures be separated?

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Yes, mixtures can be separated by physical means, such as filtration, distillation, or evaporation.

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What are homogeneous mixtures?

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Homogeneous mixtures are mixtures that have a uniform composition throughout, such as saltwater or air.

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What are heterogeneous mixtures?

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Heterogeneous mixtures are mixtures that do not have a uniform composition, such as salad or a bowl of cereal.

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What is an example of a compound?

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An example of a compound is sodium chloride (NaCl), commonly known as table salt.

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What is an example of an element?

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An example of an element is iron (Fe), which is a pure substance made of only iron atoms.

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What is an example of a mixture?

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An example of a mixture is a smoothie, which contains various fruits blended together but not chemically combined.