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 K 2 O-  potassium oxide BeF 2 -  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 NH 4 - 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 CaCO 3 -  calcium carbonate MgNO 3 -  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 Fe 2 O 3

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

Fe 2 O 3 - 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 V 2 O 5 - O=-2*5=-10  V= +10/2= +5 vandium (V) oxide