atoms, elements, molecules and compounds vocabulary

Front

What is an atom?

Back

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

Front

What is an element?

Back

A pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is a molecule?

Back

A group of two or more atoms bonded together.

Front

What is a compound?

Back

A substance formed when two or more different elements are chemically bonded together.

Front

What is a mixture?

Back

A combination of two or more substances that are not chemically bonded.

Front

What is a homogeneous mixture?

Back

A mixture that has a uniform composition throughout.

Front

What is a heterogeneous mixture?

Back

A mixture that consists of visibly different substances or phases.

Front

What distinguishes a compound from a mixture?

Back

A compound has a fixed composition and properties, while a mixture does not.

Front

Can an element exist as a molecule?

Back

Yes, some elements exist as diatomic molecules, like O2 (oxygen) or N2 (nitrogen).

Front

What is the relationship between molecules and compounds?

Back

All compounds are molecules, but not all molecules are compounds.