1. By: Brendan Timm Jesse Durrant Braedan Fitzpatrick and Austin Penrose

2.  Identify the two elements in the compound and the charges. (e.g. Lithium Oxide = Li + O 2- )  Criss cross your charges  Put the two symbols together and then remove charges.  Answer: Li 2 O Li + O 2-

3.  Name the metal in the compound  Then name the non-metal in the compound and change the ending to “ide”  e.g NaCl Sodium Chlorine to Chloride Sodium Chloride

4.  Identify element symbols and their ion charge  E.g. Chromium (iii) Oxide  Criss cross charges  Combine the two symbols and get rid of their charges  Then make into smallest possible ratio E.g. Cr 3 N 3 = CrN Cr 3+ O 2-

5.  Multivalent element: element that can form more than one stable ion  Name the metal ion, see if it has more than one charge  Un criss cross the combining capacity e.g. (Cr 2 O 3, O 2- and Cr 3+)  Chromium (III)  Chromium (III) Oxide

6.  Memorize to prefix system for subscript values of elements (mono, di, tri, tetra, penta, hexa, hepta, octa, nona, deca).  Identify the prefix for both elements and their corresponding subscript. (e.g. dinitrogen tetraoxide=2, 4)  Use the corresponding subscripts of the prefixes after their symbols. (e.g. N 2 O 4 )  Don’t reduce the subscripts.

7.  Identify the subscript values of the elements and their corresponding prefixes. (e.g. H 2 O, 2=di and 1=mono)  Write down the two elements with their prefixes before their name.  Change the ending of the second element to “ide”. (dihydrogen monoxide)  Don’t add the prefix mono if the first element has a subscript of one. (e.g. CO 2 =carbon monoxide)  Don’t reduce prefixes

8.  Write the positive ions name, will be either metal or ammonium (NH 4 + )  Determine if metal is multivalent, if it is, indicate ion charge in roman numerals  Identify the negative ion and name it Cr 3 (PO 4 ) 2 1. Chromate (II) 2. Chromate (II) Phosphate

9.  Identify each ion and its charge  E.g. Chromium (III) sulphate = Cr 3+ SO 4 -2  Criss cross charges Cr 3+ SO 4 -2  Put the symbols together and get rid of charge values.  For Polyatomic ions, use brackets around the whole ion. The whole ion has the subscript value. E.g. Cr 2 (SO 4 ) 3

10.  A hydrate is a solid compound that is surrounded by water molecules  Prefixes are also associated with hydrates - prefixes are words that represent how much of something there is

11. Naming Hydrates: 1. Name the compound as you would regularly name it 2. After writing the compound name, add the correct prefix in front of the word hydrate Ex. Al 2 O 3 3H 2 O - aluminum oxide trihydrate Writing Chemical Formulas for Hydrates: 1. Write the Elements symbol and use criss cross rule for first half of hydrate 2. Then write the prefix number in front of H 2 0 Ex. iron (II) sulphate pentahydrate - FeSO 4 5H 2 O

12.  http://stpatschem11.files.wordpress.com /2009/10/numerical_prefixes_silberberg _table_2-61.jpg?w=235&h=300 http://stpatschem11.files.wordpress.com /2009/10/numerical_prefixes_silberberg _table_2-61.jpg?w=235&h=300