Reading Chemical Formulas Advanced

Front

What is a chemical formula?

Back

A chemical formula is a way of expressing the number and type of atoms in a molecule using symbols and numbers.

Front

What does the subscript in a chemical formula indicate?

Back

The subscript indicates the number of atoms of the element in the molecule. For example, in H₂O, the '2' indicates there are 2 hydrogen atoms.

Front

How do you calculate the total number of atoms in a molecule?

Back

To calculate the total number of atoms, add the number of atoms of each element together, considering their subscripts.

Front

In the formula 4 H₂O, how many total hydrogen atoms are there?

Back

There are 8 hydrogen atoms (4 molecules x 2 hydrogen atoms each).

Front

In the formula 2 CO₂, how many total carbon atoms are there?

Back

There are 2 carbon atoms (2 molecules x 1 carbon atom each).

Front

What is the total number of atoms in H₂O₂?

Back

There are 4 total atoms (2 hydrogen + 2 oxygen).

Front

In the formula NaHCO₃, how many sodium atoms are present?

Back

There is 1 sodium atom.

Front

What does the prefix 'di-' in a chemical name indicate?

Back

The prefix 'di-' indicates that there are two atoms of that element in the molecule.

Front

How many total atoms are in the molecule C₂OH?

Back

There are 4 total atoms (2 carbon + 1 oxygen + 1 hydrogen).

Front

What is the significance of parentheses in chemical formulas?

Back

Parentheses indicate that the atoms inside them are grouped together and can be multiplied by a subscript outside the parentheses.