Counting Atoms Practice

Front

What is a coefficient?

Back

The large number to the left of a formula.

Front

How many Oxygen atoms are in Al₂(SO₄)₃?

Back

12

Front

C₁₂H₂₂O₁₁ has how many carbon atoms?

Back

12

Front

How many atoms are present if there is no subscript following the element symbol?

Back

only 1

Front

How many Magnesium atoms are in 10MgCl₂?

Back

10

Front

What does a subscript indicate in a chemical formula?

Back

The number of atoms of the element in the molecule.

Front

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

Back

2

Front

What is the total number of atoms in C₆H₁₂O₆?

Back

24 (6 C + 12 H + 6 O)

Front

What is the significance of parentheses in a chemical formula?

Back

They indicate that the enclosed atoms are a group that can be multiplied by a coefficient.

Front

How many total atoms are in 3Ca(OH)₂?

Back

15 (3 Ca + 6 O + 6 H)