Naming Chemical Compounds

CHEMICAL FORMULAE & EQUATIONS 3.5 Ionic Formula & Naming Chemical Compounds

At the end of this lesson you should be able to:

1. Write ionic formulae of ions correctly. 2. Construct chemical formulae of ionic compounds correctly. 3. State the names of chemical compounds using IUPAC nomenclature.

3.5 Ionic Formulae

IONS Particles with charges

Y+

Xˉ

Positively charged ions called CATIONS

Negatively charged ions called ANIONS

Formed from metal atom

Formed from nonmetal atom

3.5 Ionic Formulae

EXAMPLES: Compound Zinc bromide Potassium oxide

IONIC COMPOUND

Made up of CATION & ANION Cation Zn K

2+

+

Anion Brˉ O²ˉ

3.5 Ionic Formulae

Constructing ionic formula of an ionic compound Example: Potassium oxide 1. Determine the cation and anion involved. 2. Balance the positive and negative charges. 3. Write the ionic formula without the charges.

K

+

O²ˉ 1

2 K2O

3.5 Ionic Formulae

Construct the ionic formula for these compounds: • Calcium chloride • Sodium bromide • Magnesium hydroxide • Aluminium carbonate • Potassium permanganate • Ammonium sulphate

3.5 Naming Chemical Compounds

For ionic compounds:

RULE 1

i. Name the cation. ii. Name the anion. EXAMPLE: Na+

Sodium ion Sodium chloride

Cl -

Chloride ion

3.5 Naming Chemical Compounds

RULE 2

The use of Roman numerals For certain metals that can form more than one type of ions

Metal Copper, Cu Iron, Fe Manganese, Mn EXAMPLE:

Ions Cu

+

Cu 2+

Fe 2+

Fe 3+

Mn 2+

Mn 4+

Copper(II) oxide

Copper(I) oxide

3.5 Naming Chemical Compounds

For simple molecular compounds:

RULE 3

i. Maintain the name of the 1st element ii. Name of the 2nd element is added with ‘ide’ EXAMPLE: H+

Hydrogen ion Hydrogen chloride

Cl -

Chloride ion

RULE 4

The used of Greek prefixes To show the number of atoms of each elements in a compound.

EXAMPLE: Chemical formula NO CO2 SO3

Naming Nitrogen monoxide Carbon dioxide Sulphur trioxide

3.5 Naming Chemical Compounds

Name the following formulae: • KBr • LiCl • ZnSO4 • NaHCO3 • Ca(OH)2 • AlPO4

POP QUIZ

POP QUIZ!!!

Construct the chemical formulae of the following compounds: Calcium chloride Copper(II) oxide Magnesium carbonate Lead sulphite Iron(II) hydroxide

POP QUIZ!!!

Name the following compounds: Ba(NO3)2 CuCl2 NaHCO3 AlPO4 (NH4)3PO4