Types of Chemical Formulas

Types of Chemical Formulas

Quality and Quantity:

Na(PO₄)₃

_{- What do we know by looking this formula?}

_{Quality: Sodium, Phosphorous, and Oxygen.}

_{Quantity: 1 atom of Na, 3 atoms of Phosphorous, and 12 atoms of Oxygen.}

THINK ABOUT THIS:

When there is a subscript outside the parenthesis, this tells us the number of molecules present for that particular polyatomic ion.

So...... (PO₄)₃ means that you have 3 molecules of PO_4.

(PO₄)_{3 =} PO₄ PO₄ PO₄

g

Poll

Do you understand how to determine the quality and quantity of a compound?

• YES

• NO

Coefficient is the number of moles that are present for a particular compound.

• Example: 2NaCl

• There are 2 moles of NaCl

• There are 2 compounds of NaCl

• So you really have NaCl NaCl

• The coefficient gets distributed to each element within the compound.

Open Ended

TRY THIS: What is the quality and quantity of:

3Ca(OH)₂