Elements, Compounds and Mixtures

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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 pure substance formed when two or more different types of atoms bond together chemically.

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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 a homogeneous mixture?

Back

A homogeneous mixture is a mixture that has a uniform composition throughout, such as lemonade.

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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, such as salad.

Front

What is table salt (NaCl)?

Back

Table salt is a compound made of sodium (Na) and chlorine (Cl) atoms.

Front

How many different types of atoms are in water (H2O)?

Back

There are 2 different types of atoms in water: hydrogen (H) and oxygen (O).

Front

What is the difference between a compound and a mixture?

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A compound is a substance formed from two or more elements chemically bonded, while a mixture is a physical combination of substances that can be separated.

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What is an example of a homogeneous mixture?

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An example of a homogeneous mixture is saltwater.

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What is an example of a heterogeneous mixture?

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An example of a heterogeneous mixture is a bowl of cereal with milk.