Pure Substances and Mixtures

Front

What is a pure substance?

Back

A pure substance is matter that has a uniform and definite composition. It can be an element or a compound.

Front

What is a mixture?

Back

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

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is a compound?

Back

A compound is a pure substance formed when two or more elements are chemically bonded together.

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture that has a uniform composition throughout, such as saltwater.

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a mixture that does not have a uniform composition, such as salad or orange juice with pulp.

Front

Is air a homogeneous or heterogeneous mixture?

Back

Air is a homogeneous mixture because its composition is uniform throughout.

Front

Can elements be considered pure substances?

Back

Yes, elements are considered pure substances because they consist of only one type of atom.

Front

Can compounds be considered pure substances?

Back

Yes, compounds are considered pure substances because they consist of two or more elements chemically bonded together.

Front

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.