Counting Atoms Practice

Front

What is the total number of potassium atoms in the formula K₈?

Back

8

Front

What does a subscript indicate in a chemical formula?

Back

A subscript is a small number below an element symbol that tells the number of atoms of that element.

Front

How many molecules are represented by the formula 2C₆H₁₂O₆?

Back

2

Front

Does Mg(NO₃)₂ have five oxygen atoms per formula unit?

Back

False, it has six oxygen atoms.

Front

How many different elements are in the formula C₄H₁₀O?

Back

3

Front

What is the purpose of subscripts in chemical formulas?

Back

Subscripts indicate the number of atoms of each element in a compound.

Front

In the formula H₂O, how many hydrogen atoms are present?

Back

2

Front

What is the total number of atoms in the formula C₃H₈?

Back

11 (3 carbon + 8 hydrogen = 11 total atoms).

Front

What does the formula NaCl represent?

Back

Sodium chloride, which consists of one sodium atom and one chlorine atom.

Front

How many oxygen atoms are in the formula Ca(NO₃)₂?

Back

6 oxygen atoms.