Unit 2 Chemistry

Naming Compounds

Unit 2 Chemistry

Ionic bonds

What is an ionic bond?

Quick rule: never use capital letters when writing names

Why name compounds? So we know what is in products and what could be

dangerous Compounds found at home = chemical names

Bleach = sodium hypochlorite Baking soda = sodium bicarbonate Antifreeze = ethylene glycol Table salt = sodium chloride Vinegar = acetic acid Nail polish

remover = acetone

Glass cleaner = ammonia

Toothpaste = sodium fluoride

Ionic Bond naming

An ionic bond is between a metal and non-metal First write the cation (metal) first and do

not change the name at all Then write the anion (non-metal) second

but add the suffix –ide to the name Ex oxide, carbide, hydride, sulfide, chloride

Examples

NaCl- sodium chloride

LiBr- lithium bromide

K2O- potassium oxide

BeF2- beryillium flouride

Ionic bonds with polynomials

If there are more than two elements in the bond then one is a polynomial

The polynomial is almost always the anion except for NH4- ammonia

First write the metal name unchanged Next write the polynomial name

unchanged You find the names of polynomials from

the back of the table

Examples

NaOH- sodium hydroxide

CaCO3- calcium carbonate

MgNO3- magnesium nitrate

Easy right? some metals have more than one charge

making it more complicated Ex: Fe can have +3 or +2

Mn can have +2 or +4

V can have +5 or +4

When a metal has more than one charge you need to determine what the charge is: Ex iron and oxygen can be FeO or Fe2O3

Finding charges

Find what the negative charge is and then the positive charge has to be equal to that FeO- O is -2 so Fe has to be +2 Put the charge of the metal in roman

numerals right after the metal iron (II) oxide

Fe2O3- oxygen is -2*3= -6 so the cations add up to +6 Since there are 2 Fe, each one would be

+3 (+6/2) iron (III) oxide

CuCl- Cl=-1 so Cu must be +1 copper (I) chloride

Examples

V2O5- O=-2*5=-10 V= +10/2= +5

vandium (V) oxide