Elements, Mixtures, and Compounds

Front

What percentage of Earth's atmosphere is made up of Nitrogen?

Back

Approximately 80%.

Front

Which element makes up most of our oceans?

Back

Oxygen.

Front

Who arranged the elements into the Periodic Table?

Back

Dimitri Mendeleev.

Front

What can be said about the properties of a compound compared to its parts?

Back

The properties of a compound can be totally different than the properties of the parts.

Front

Which of the following is NOT an element: Na, K, O2, CO?

Back

CO (Carbon Dioxide is a compound, not an element).

Front

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

Front

What is a mixture?

Back

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

Front

Give an example of a compound.

Back

Water (H2O) is a compound made of hydrogen and oxygen.

Front

Give an example of a mixture.

Back

Air is a mixture of gases, including nitrogen, oxygen, and carbon dioxide.