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Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved. Chapter 9 Chemical Names and Formulas 9.1 Naming Ions 9.2 Naming and Writing.

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Presentation on theme: "Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved. Chapter 9 Chemical Names and Formulas 9.1 Naming Ions 9.2 Naming and Writing."— Presentation transcript:

1 Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved. 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

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

3 Predicting Ionic Charges Group 1A: Lose 1 electron to form 1+ ions H1+H1+H1+H1+ Li 1+ Na 1+ K1+K1+K1+K1+ Rb 1+

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 o Binary ionic compound o Transition metal compound o 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 o There can be more than 2 or more atoms though  NaCl  K 2 O  Al 2 S 3

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 K 2 O Al 2 S 3

9 Name the following compounds  KI  MgO  SrS  BeF 2  Li 2 O  Al 2 O 3  Cs 3 N  Ba 3 P 2 Worksheet

10 Writing Chemical Formulas To write formulas it is important to remember that the charges on the compound must be balanced o 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 o They represent the quantity of each element o No subscript equals 1 atom Li + O 2- the charges are not equal o There is only one positive and two negatives o We need another positive charge to make them equal o Li 2 O

12 Write formulas for the following compounds o Sodium sulfide o Potassium iodide o Calcium bromide o Aluminum oxide o Boron bromide o Rubidium selenide

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 Fe 2+ or Fe 3+

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18 Polyatomic ions are ions that contain more than one atom o (SO 4 ) 2- o (OH) - o (PO 4 ) 3- o (NH 4 ) + It is important to note that the charge is distributed throughout all the atoms in the ion o Not only on the last atom

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