Chemical formulas

Front

What is a molecule?

Back

A molecule is formed when two or more atoms are chemically bonded together.

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture that is uniform in composition, meaning its components are evenly distributed and cannot be easily separated, like a milkshake.

Front

How many oxygen atoms are in a molecule of H2O?

Back

There is 1 oxygen atom in a molecule of H2O.

Front

How many hydrogen atoms are in a molecule of H2O?

Back

There are 2 hydrogen atoms in a molecule of H2O.

Front

How many oxygen atoms are in a molecule of CO2?

Back

There are 2 oxygen atoms in a molecule of CO2.

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

Front

What is a chemical formula?

Back

A chemical formula is a way of expressing information about the proportions of atoms that constitute a particular chemical compound.

Front

What does the subscript in a chemical formula indicate?

Back

The subscript in a chemical formula indicates the number of atoms of the element present in the molecule.

Front

What is the chemical formula for water?

Back

The chemical formula for water is H2O.

Front

What is the chemical formula for carbon dioxide?

Back

The chemical formula for carbon dioxide is CO2.