Matter: Concept 3

Front

What are atoms?

Back

Atoms are the building blocks of matter and the smallest unit of an element that maintains the identity of the element.

Front

Give an example of atoms.

Back

Atmospheric nitrogen N₂ contains 2 atoms of the element nitrogen.

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into anything simpler or more stable.

Front

Give an example of an element.

Back

Anything seen on the periodic table.

Front

What is a compound?

Back

A compound is a pure substance that can be broken down chemically into simpler and more stable substances (elements).

Front

How are compounds made?

Back

Compounds are made from chemically combining atoms of two or more elements.

Front

Give an example of a compound.

Back

H2O (water).

Front

What are pure substances?

Back

Pure substances have fixed composition and same properties throughout.

Front

Give examples of pure substances.

Back

He, O₂, NaCl, C₆H₁₂O₆.

Front

What is a mixture?

Back

A combination of two things that are not chemically combined and can be separated into separate substances.