Elements, Compounds, Atoms, and Molecules

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. It consists of only one type of atom.

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together.

Front

What is an atom?

Back

An atom is the smallest unit of an element that retains the properties of that element. It consists of protons, neutrons, and electrons.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together, which can be of the same or different elements.

Front

What is the difference between a mixture and a compound?

Back

A mixture is a combination of two or more substances that are not chemically bonded, while a compound is formed when substances are chemically bonded.

Front

What is the chemical symbol for hydrogen?

Back

The chemical symbol for hydrogen is H.

Front

What is the chemical formula for methane?

Back

The chemical formula for methane is CH4.

Front

What are the two main types of substances in chemistry?

Back

The two main types of substances are elements and compounds.

Front

Can a compound be made of the same type of atoms?

Back

No, a compound must consist of two or more different types of atoms.

Front

What is the relationship between molecules and compounds?

Back

All compounds are molecules, but not all molecules are compounds. Molecules can consist of the same type of atoms.