Counting Atoms

Front

What is the chemical formula for water?

Back

H₂O

Front

How many atoms of hydrogen are in one molecule of water (H₂O)?

Back

2

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 calculate the total number of atoms in a compound?

Back

Add the number of atoms of each element, considering their subscripts.

Front

In the compound Al₂(SO₄)₃, how many sulfur (S) atoms are present?

Back

3

Front

What is the total number of oxygen atoms in the compound Al₂(SO₄)₃?

Back

12 (4 oxygen atoms per sulfate group, and there are 3 sulfate groups).

Front

How many chlorine (Cl) atoms are in the compound CaCl₂?

Back

2

Front

If you have 3CaCl₂, how many total chlorine atoms do you have?

Back

6 (3 x 2 = 6).

Front

What is the formula to find the number of hydrogen atoms in ammonium (NH₄)?

Back

1 molecule of NH₄ contains 4 hydrogen atoms.

Front

How many hydrogen atoms are in 3(NH₄)₂CrO₄?

Back

24 (3 x 2 x 4 = 24).