Elements, Compounds, and Mixtures

Front

What is an atom?

Back

The smallest unit of an element that retains the properties of that element.

Front

What makes an atom stable?

Back

An atom is most stable when its outer shell of electrons is complete.

Front

What is a physical property?

Back

A characteristic of a substance that can be observed or measured without changing its identity, such as density, color, or odor.

Front

What is a chemical property?

Back

A characteristic of a substance that describes its ability to change into different substances, such as reactivity with acid.

Front

What is density?

Back

Density is a physical property that measures how much mass is contained in a given volume.

Front

What is a homogeneous mixture?

Back

A mixture that has a uniform composition throughout, such as salt water.

Front

What is a heterogeneous mixture?

Back

A mixture that consists of visibly different substances or phases, such as salad.

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What are pure substances?

Back

Materials that are made of only one type of particle and have a constant composition, such as elements and compounds.

Front

What is a compound?

Back

A substance formed when two or more elements chemically bond together in a fixed ratio.

Front

What is a mixture?

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