Atoms, Elements, Molecules & Compounds

Front

What is an atom?

Back

The smallest unit of matter that retains the properties of an element.

Front

What is an element?

Back

A pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is a molecule?

Back

A group of two or more atoms bonded together.

Front

What is a compound?

Back

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

Front

What is a mixture?

Back

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

Front

What is the difference between a compound and a mixture?

Back

A compound has a fixed composition and properties, while a mixture can vary in composition and retains the properties of its components.

Front

Give an example of a compound.

Back

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

Front

Give an example of an element.

Back

Oxygen (O) is an element that is essential for life.

Front

What are the two main types of substances?

Back

Pure substances (elements and compounds) and mixtures.

Front

What is the chemical formula for table salt?

Back

The chemical formula for table salt is NaCl.