Elements Compounds and Elements

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include hydrogen, oxygen, and gold.

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What is a compound?

Back

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

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded. The substances in a mixture retain their individual properties. Examples include air and salad.

Front

How can you identify an element?

Back

An element can be identified by its unique atomic number, which represents the number of protons in its nucleus.

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 physically combined but not chemically bonded.

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What is an example of a pure substance?

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An example of a pure substance is distilled water, which contains only H2O molecules.

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What is the term for a substance made of only one type of atom?

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The term is 'element'.

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What is the term for a substance made of two or more different types of atoms bonded together?

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The term is 'compound'.

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What is an example of a mixture?

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An example of a mixture is a salad, which contains various ingredients that are not chemically combined.

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What is air classified as?

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Air is classified as a mixture because it contains different gases that are not chemically bonded.