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 the chemical formula for water?

Back

H₂O

Front

How many atoms are in a molecule of H₂O?

Back

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

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

How many atoms of Oxygen are in CO₂?

Back

There are 2 atoms of Oxygen in CO₂.

Front

What is the formula for calculating the total number of atoms in a compound?

Back

Total atoms = sum of all subscripts in the chemical formula.

Front

How many Magnesium atoms are in MgCl₂?

Back

There is 1 Magnesium atom in MgCl₂.

Front

How many Hydrogen atoms are in 2H₂O?

Back

There are 4 Hydrogen atoms in 2H₂O.

Front

What is the significance of the coefficient in a chemical formula?

Back

The coefficient indicates how many molecules of the compound are present.

Front

How many Sodium (Na) atoms are in NaCl?

Back

There is 1 Sodium atom in NaCl.