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 atoms in a chemical formula?

Back

Count the number of each type of atom represented in the formula, including subscripts.

Front

What does a subscript in a chemical formula indicate?

Back

A subscript indicates the number of atoms of the element that precedes it.

Front

What does a coefficient in a chemical equation represent?

Back

A coefficient indicates the number of molecules or moles of a substance.

Front

How many atoms are in H₂O?

Back

There are 3 atoms in H₂O (2 Hydrogen and 1 Oxygen).

Front

How many total atoms are in C₆H₁₂O₆?

Back

There are 24 total atoms in C₆H₁₂O₆ (6 Carbon, 12 Hydrogen, 6 Oxygen).

Front

What is the total number of atoms in 2H₂O?

Back

There are 6 total atoms in 2H₂O (4 Hydrogen and 2 Oxygen).

Front

How many atoms of Calcium are in CaCl₂?

Back

There is 1 atom of Calcium in CaCl₂.

Front

How many atoms of Iron are in Fe₂O₃?

Back

There are 2 atoms of Iron in Fe₂O₃.