Elements, Compounds, Atoms, and Molecules

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element. It consists of a nucleus containing protons and neutrons, surrounded by electrons.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together. Molecules can consist of the same or different types of atoms.

Front

What is a compound?

Back

A compound is a substance formed when two or more different types of atoms bond together in a fixed ratio.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms.

Front

What is the chemical symbol for hydrogen?

Back

The chemical symbol for hydrogen is H.

Front

What is methane?

Back

Methane (CH4) is a compound made of one carbon atom and four hydrogen atoms.

Front

What are pure substances?

Back

Pure substances are materials that have a uniform and definite composition. They can be elements or compounds.

Front

What is the relationship between atoms and molecules?

Back

Atoms combine to form molecules through chemical bonds.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means.

Front

What is the difference between a mixture and a compound?

Back

A mixture contains two or more substances that are not chemically combined, while a compound consists of two or more different atoms chemically bonded together.