Science Final - Elements, Compounds, Mixtures

Front

What is a compound?

Back

A compound is a pure substance formed when two or more different elements chemically bond together. Example: Water (H₂O) is a compound made of hydrogen and oxygen.

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Example: Oxygen (O) is an element.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded. Example: Air is a mixture of gases.

Front

What is a molecule?

Back

A molecule is the smallest unit of a compound that retains its chemical properties. Example: A water molecule (H₂O) consists of two hydrogen atoms and one oxygen atom.

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout. Examples include elements and compounds.

Front

What is the difference between a compound and a mixture?

Back

A compound is formed by the chemical combination of elements, while a mixture is a physical combination of substances that can be separated.

Front

What is an example of a pure substance made from only one type of atom?

Back

Oxygen gas (O₂) is a pure substance made from only one type of atom.

Front

What is the chemical formula for water?

Back

The chemical formula for water is H₂O.

Front

What is salt water?

Back

Salt water is a mixture of salt (sodium chloride) and water, where the salt is dissolved in the water.

Front

What is air?

Back

Air is a mixture of different gases, primarily nitrogen and oxygen, along with small amounts of other gases.