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Chapter 9 Chemical Names and Formulas 9.1 Naming Ions

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1 Chapter 9 Chemical Names and Formulas 9.1 Naming Ions
9.2 Naming and Writing Formulas for Ionic Compounds 9.3 Naming and Writing Formulas for Molecular Compounds 9.4 Naming and Writing Formulas for Acids and Bases 9.5 The Laws Governing How Compounds Form Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

2 Naming Ions Monoatomic ion – one atom with charge
Ion – atom with charge cation- metals, location: left of periodic table, positive charge anion – nonmetals, right of table, negative charge

3 Predicting Ionic Charges
Group 1A: Lose 1 electron to form 1+ ions H1+ Li1+ Na1+ K1+ Rb1+ Please point to other groups to have students recall valence electrons and determine the charge of the elements in each column.

4 Predicting Ionic Charges
The charge is sometimes referred to as the oxidation number or oxidation state

5 Chemical names and Formulas
There are three types of ionic compounds to write formulas for and name Binary ionic compound Transition metal compound Ionic compound containing polyatomic ions Covalent compounds have a different naming system It uses prefixes Acids

6 Chemical names and Formulas
Binary ionic compounds are made up of only 2 different elements There can be more than 2 or more atoms though NaCl K2O Al2S3

7 To name a binary ionic compound
Write the name of the cation first (always a metal) Write the name of the anion, but change the ending to –ide Note that any subscripts do not change the name NaCl sodium chlorine → chloride sodium chloride

8 Chemical Naming K2O Al2S3 Please do together as a class.
Potassium oxide. Aluminum sulfide

9 Name the following compounds
Worksheet Name the following compounds KI MgO SrS BeF2 Li2O Al2O3 Cs3N Ba3P2 Have students name compounds in their notebooks.

10 Writing Chemical Formulas
To write formulas it is important to remember that the charges on the compound must be balanced Same total number of positive and negative charges Determine if the charges are balanced NaCl LiO KI BeBr NaBr

11 When charges are not balanced, it is necessary to add subscripts
They represent the quantity of each element No subscript equals 1 atom Li+O2- the charges are not equal There is only one positive and two negatives We need another positive charge to make them equal Li2O

12 Write formulas for the following compounds
Sodium sulfide Potassium iodide Calcium bromide Aluminum oxide Boron bromide Rubidium selenide Have students write formulas in notebook.

13 Writing Formulas for transition metals
Sometimes the metal in a compound is a transition metal Transition metals can have various oxidation numbers or charges For example iron can be either Fe2+ or Fe3+ Transition metals can move their electrons from the s to the d orbitals. This gives them various oxidation numbers or charges.





18 Polyatomic ions are ions that contain more than one atom
(SO4)2- (OH)- (PO4)3- (NH4)+ It is important to note that the charge is distributed throughout all the atoms in the ion Not only on the last atom







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