Pure Substances and Mixtures Flashcard

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout. It can be an element or a compound.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances where each retains its own properties. Mixtures can be homogeneous or heterogeneous.

Front

Define homogeneous mixture.

Back

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

Front

Define heterogeneous mixture.

Back

A heterogeneous mixture is a mixture that has a non-uniform composition, where the different components can be seen, such as a salad.

Front

What is a compound?

Back

A compound is a substance formed when two or more different types of atoms chemically bond together.

Front

What is the difference between a molecule and a compound?

Back

A molecule is a group of two or more atoms bonded together, which can be of the same or different elements. A compound is a specific type of molecule that contains at least two different types of atoms.

Front

Give an example of a pure substance that is an element.

Back

Oxygen (O) is an example of a pure substance that is an element.

Front

Give an example of a pure substance that is a compound.

Back

Water (H2O) is an example of a pure substance that is a compound.

Front

What is an example of a homogeneous mixture?

Back

An example of a homogeneous mixture is vinegar.

Front

What is an example of a heterogeneous mixture?

Back

An example of a heterogeneous mixture is a bowl of cereal with milk.