Counting Atoms in Chemical Formulas

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

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

Back

Count the different chemical symbols present in the formula.

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 C6H12O6, how many total atoms are there?

Back

There are 24 total atoms (6 Carbon + 12 Hydrogen + 6 Oxygen).

Front

What is the significance of parentheses in chemical formulas?

Back

Parentheses indicate that the atoms inside are grouped together and the subscript outside applies to all atoms within the parentheses.

Front

How many atoms of each element are in the formula C3H5(NO3)3?

Back

C = 3, H = 5, N = 3, O = 9.

Front

What is the formula for one sulfur atom, three hydrogen atoms, and four oxygen atoms?

Back

H3SO4.

Front

How many sodium atoms are in the formula 6NaCl?

Back

There are 6 sodium atoms.

Front

What is the difference between a coefficient and a subscript in a chemical formula?

Back

A coefficient indicates the number of molecules, while a subscript indicates the number of atoms in a molecule.

Front

How do you determine the number of oxygen atoms in the formula CH4COOH2?

Back

Count the subscripts for oxygen: 2 from COOH and 0 from CH4, totaling 2 oxygen atoms.