Elements, Compounds, and Mixtures

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded together. Examples include air, salad, and sand.

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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. Examples include hydrogen, oxygen, and gold.

Front

What is a compound?

Back

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

Front

Are compounds found on the periodic table?

Back

No, because only elements are listed on the periodic table.

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What are subscripts in a chemical formula?

Back

Subscripts are numbers written below and to the right of a chemical symbol in a formula, indicating the number of atoms of that element in the compound.

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What is the difference between a compound and a mixture?

Back

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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Can a mixture be separated by physical means?

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Yes, mixtures can be separated by physical means such as filtration, distillation, or evaporation.

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What is an example of a homogeneous mixture?

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An example of a homogeneous mixture is saltwater, where the salt is evenly distributed throughout the water.

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What is an example of a heterogeneous mixture?

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An example of a heterogeneous mixture is a salad, where the different ingredients can be seen and separated.

Front

What is a chemical formula?

Back

A chemical formula is a way of expressing the composition of a compound using symbols for the elements and numbers to indicate the ratio of atoms.