Counting Atoms REVIEW

Front

What does the subscript in a chemical formula tell you?

Back

It tells you how many atoms of each element are present in the molecule.

Front

What elements are represented in the chemical formula Fe₂O₃?

Back

Iron (Fe) and Oxygen (O).

Front

What does the absence of a subscript after an atom indicate?

Back

It indicates that 1 atom of that element is present.

Front

How many groups of SO₄ are in Al₂(SO₄)₃?

Back

There are 3 groups of SO₄.

Front

What are the numbers found on the lower right-hand side of an element symbol called?

Back

They are called subscripts.

Front

What is a coefficient in a chemical formula?

Back

A coefficient indicates the number of molecules or moles of a compound.

Front

In the formula C₆H₁₂O₆, how many hydrogen atoms are present?

Back

There are 12 hydrogen atoms.

Front

What does the formula NaCl represent?

Back

It represents sodium chloride, which consists of sodium and chlorine atoms.

Front

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

Back

Add the subscripts of all elements in the chemical formula.

Front

What is the significance of parentheses in a chemical formula?

Back

Parentheses indicate that the enclosed group of atoms is a polyatomic ion or a group that is repeated.