atoms and molecules

Front

What is an atom?

Back

An atom is the smallest unit of matter that cannot be broken down into smaller pieces. It is the basic building block of all substances.

Front

What is a molecule?

Back

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

Front

Is Helium an element?

Back

Yes, Helium is an element.

Front

Is CO2 an element?

Back

No, CO2 (carbon dioxide) is a compound made of carbon and oxygen atoms.

Front

How many hydrogen atoms are in a water molecule (H2O)?

Back

There are 2 hydrogen atoms in a water molecule.

Front

What does atomic mass tell us?

Back

Atomic mass tells us how much an atom weighs.

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 bonded together.

Front

What is a chemical bond?

Back

A chemical bond is the force that holds atoms together in a molecule.

Front

Can an atom be broken down into smaller pieces?

Back

No, an atom cannot be broken down into any smaller piece of matter.

Front

What is the symbol for water?

Back

The symbol for water is H2O.