Counting Atoms

Front

What is the chemical formula for Magnesium Chloride?

Back

MgCl₂

Front

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

Back

2

Front

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

Back

23 (2 Al + 12 O + 6 S = 20 total atoms)

Front

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

Back

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

Front

How many different elements are present in the compound C₆H₁₂O₆?

Back

3 (Carbon, Hydrogen, Oxygen)

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 Oxygen atoms in a compound with parentheses, such as Al₂(SO₄)₃?

Back

Multiply the number of Oxygen atoms in the sulfate ion (4) by the coefficient outside the parentheses (3), resulting in 12 Oxygen atoms.

Front

What does the coefficient in front of a chemical formula indicate?

Back

The coefficient indicates the number of molecules or formula units of that compound.

Front

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

Back

2 Nitrogen atoms.

Front

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

Back

3 (Aluminum, Sulfur, Oxygen)