Counting Atoms

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together.

Front

What is a compound?

Back

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

Front

How do you count atoms in a chemical formula?

Back

Count the number of each type of atom represented in the formula, using subscripts to indicate the quantity.

Front

What does the subscript in a chemical formula indicate?

Back

The subscript indicates the number of atoms of the element in the molecule.

Front

In the formula H₂O, how many hydrogen atoms are there?

Back

There are 2 hydrogen atoms in H₂O.

Front

In the formula CO₂, how many oxygen atoms are there?

Back

There are 2 oxygen atoms in CO₂.

Front

What is the chemical formula for glucose?

Back

The chemical formula for glucose is C₆H₁₂O₆.

Front

How many total atoms are in C₆H₁₂O₆?

Back

There are 24 total atoms in C₆H₁₂O₆ (6 C, 12 H, 6 O).

Front

What is the total number of oxygen atoms in Fe(NO₃)₃?

Back

There are 9 oxygen atoms in Fe(NO₃)₃.