Counting Atoms

Front

What does the coefficient in a chemical formula represent?

Back

The coefficient represents the number of formula units of the compound.

Front

How many sulfur atoms are present in H₂SO₄?

Back

1 sulfur atom.

Front

How many lead (Pb) ions are in the compound 3Pb(NO₂)₂?

Back

3 lead (Pb) ions.

Front

Calculate the total number of atoms in 4N₂.

Back

8 total atoms.

Front

How many carbon atoms are in one formula unit of K₂CO₃?

Back

2 carbon atoms.

Front

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

Back

24 total atoms (6 C, 12 H, 6 O).

Front

Define a chemical formula.

Back

A chemical formula is a way of expressing information about the proportions of atoms that constitute a particular chemical compound.

Front

What is the significance of subscripts in a chemical formula?

Back

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

Front

How do you determine the number of atoms in a compound with parentheses, like Ca(NO₃)₂?

Back

Multiply the number of atoms inside the parentheses by the subscript outside (2 in this case). So, Ca(NO₃)₂ has 1 Ca, 2 N, and 6 O.

Front

What is the total number of atoms in 2H₂O?

Back

6 total atoms (4 H, 2 O).