Counting Atoms in Chemical Formulas

Front

What does the subscript in a chemical formula indicate?

Back

The subscript indicates the number of atoms of that element in the molecule.

Front

In the formula H₂SO₄, how many atoms of sulfur (S) are present?

Back

1 atom of sulfur (S).

Front

In the formula C₃H₅(NO₃)₃, how many oxygen (O) atoms are there?

Back

9 oxygen (O) atoms.

Front

What is the role of coefficients in chemical formulas?

Back

Coefficients multiply all the atoms in the molecule.

Front

How many fluorine (F) atoms are in the formula 4CF₂Cl₂?

Back

8 fluorine (F) atoms.

Front

What is the total number of atoms in the formula H₂O?

Back

3 atoms (2 hydrogen and 1 oxygen).

Front

In the formula C₆H₁₂O₆, how many carbon (C) atoms are present?

Back

6 carbon (C) atoms.

Front

What does a coefficient of 2 in front of a compound indicate?

Back

It indicates that there are two of that entire compound.

Front

In the formula 3NaCl, how many sodium (Na) atoms are there?

Back

3 sodium (Na) atoms.

Front

What is the total number of atoms in the formula 2H₂ + O₂?

Back

4 atoms (4 hydrogen and 2 oxygen).