Counting Atoms Practice

Front

What is the chemical formula for Calcium Carbonate?

Back

CaCO₃

Front

How many elements are in the substance CaCO₃?

Back

3

Front

What is the formula for Sodium Chloride?

Back

NaCl

Front

How many atoms of Sodium and Chlorine are in NaCl?

Back

Na=1, Cl=1

Front

What does a subscript in a chemical formula indicate?

Back

The number of atoms of the element in the molecule.

Front

How many Hydrogen atoms are in 4H₂O?

Back

8

Front

What does it mean if there is no subscript following an element symbol?

Back

It means there is only 1 atom of that element.

Front

What is the total number of atoms in C₃H₅(NO₃)₃?

Back

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

Front

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

Back

Add the number of atoms of each element together.

Front

What is the significance of parentheses in a chemical formula?

Back

They indicate that the atoms inside the parentheses are grouped together and multiplied by the subscript outside.