2.6 - Elements, Compounds and Mixtures

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. It consists of only one type of atom.

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What is a compound?

Back

A compound is a substance formed when two or more elements chemically bond together in fixed proportions.

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What is a mixture?

Back

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

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What is an atom?

Back

An atom is the smallest unit of a chemical element that retains its chemical properties.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together, which can be of the same or different elements.

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture that has a uniform composition and appearance throughout, such as saltwater.

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What is a heterogeneous mixture?

Back

A heterogeneous mixture is a mixture that has a non-uniform composition, where the different components can be seen, such as a salad.

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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), such as sugar in water.

Front

What happens when elements form a compound?

Back

When elements form a compound, chemical bonds are created between the atoms of the elements.

Front

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 consists of two or more substances that are not chemically bonded.