Counting Atoms

Front

What is the chemical formula for sodium carbonate?

Back

Na₂CO₃

Front

How many different elements are present in the compound C₆H₁₂O₆?

Back

3 (Carbon, Hydrogen, Oxygen)

Front

What is the total number of atoms in the compound H₂SO₄?

Back

7 (2 H, 1 S, 4 O)

Front

How do you determine the number of atoms of an element in a chemical formula?

Back

Count the subscript next to the element symbol; if there is no subscript, it is 1.

Front

In the compound C₂H₈O, how many hydrogen atoms are there?

Back

8

Front

What does the subscript in a chemical formula indicate?

Back

The number of atoms of the element in one molecule of the compound.

Front

How many total atoms are in the compound 3(NH₄)₂CrO₄?

Back

24 (3 x (2 N + 8 H + 1 Cr + 4 O) = 24)

Front

What is the significance of parentheses in chemical formulas?

Back

Parentheses indicate that the enclosed group of atoms is a subunit that is multiplied by the coefficient outside.

Front

How many elements are in the compound C₂H₈?

Back

3 (Carbon, Hydrogen, Oxygen)

Front

What is the total number of atoms in the compound C₆H₁₂O₆?

Back

24 (6 C + 12 H + 6 O = 24)