Elements, Compounds, 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 oxygen, gold, and hydrogen.

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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 a mixture?

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A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means. Examples include salad and air.

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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 saltwater.

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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 and the different components can be seen. An example is a bowl of cereal.

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What is a colloid?

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A colloid is a type of mixture where tiny particles of one substance are evenly distributed throughout another substance. An example is fog.

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What is a solution?

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A solution is a 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 difference between a compound and a mixture?

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

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What is an example of an element?

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Examples of elements include iron (Fe), oxygen (O), and carbon (C).

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What is an example of a compound?

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Examples of compounds include sodium chloride (NaCl) and methane (CH4).