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 bonded together. Examples include air, salad, and saltwater.

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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 a compound?

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A compound is a substance formed when two or more different elements are chemically bonded together. Examples include water (H2O) and ammonia (NH3).

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What is the chemical formula for water?

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The chemical formula for water is H2O, which indicates it is made of two hydrogen atoms and one oxygen atom.

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What distinguishes a compound from a mixture?

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A compound is made of two or more elements that are chemically bonded, while a mixture consists of two or more substances that are physically combined.

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What is the chemical formula for ammonia?

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The chemical formula for ammonia is NH3, which consists of one nitrogen atom and three hydrogen atoms.

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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 difference between a homogeneous mixture and a heterogeneous mixture?

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A homogeneous mixture has a uniform composition throughout (like saltwater), while a heterogeneous mixture has a non-uniform composition (like a salad).

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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 an example of a mixture?

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An example of a mixture is air, which contains various gases like nitrogen, oxygen, and carbon dioxide.