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

How do you count the total number of atoms in a chemical formula?

Back

Add the subscripts of each element in the formula. If there is a coefficient, multiply the total by that number.

Front

What does a subscript in a chemical formula indicate?

Back

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

Front

What does a coefficient in a chemical formula indicate?

Back

A coefficient indicates the number of molecules or moles of the compound.

Front

How many total atoms are in the formula He2Ag3N4O?

Back

10

Front

How many total atoms are in the formula CN6Fe2?

Back

9

Front

Identify the coefficient in the formula 3BeH5Si8.

Back

3

Front

How many atoms of Calcium (Ca) are in the formula H3O5CaCl7?

Back

1

Front

How many elements are in the formula CO2H5?

Back

3