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1 [http://wps.prenhall.com/wps/media/objects/476/488316/Instructor_Resources/Chapter_05/FG05_07.JPG]

2 Why Are Chemical Names & Formulas Important? Click here for Coalition to Ban DHMO Website Click here for the Supporters of DHMO Use Website

3 Why Are Chemical Names & Formulas Important? What is DHMO??? Formula: H 2 O Accepted Chemical Name (IUPAC): Water Systematic Names (synonyms): Dihydrogen Monoxide, Dyhydrogen oxide, Hydroxyl Acid, Hydrogen Hydroxide

4 Compounds Combinations of two or more atoms that are held together by “bonds” between the atoms. [http://www.chm.davidson.edu/student/che105/femohammed/chem/Images/nacl.jpg]

5 Compounds Chemical formulas are used to show what combinations of atoms exist in a compound. [http://wps.prenhall.com/wps/media/objects/476/488316/Instructor_Resources/Chapter_05/FG05_06-01un.JPG]

6 Compounds Example: Al 2 O 3 2 Aluminum atoms, 3 Oxygen atoms Example: Mg(OH) 2 1 Mg, 2 Oxygen, 2 Hydrogen

7 Compounds Each compound has it’s own specific properties that may not always be like other similar compounds. Carbon Monoxide vs. Carbon Dioxide [http://wps.prenhall.com/wps/media/objects/476/488316/Instructor_Resources/Chapter_05/FG05_06-02a.JPG]

8 Ions These are formed when an atom gains or loses electrons They have the same number of electrons as a noble gas (octet rule!) Fluorine p + = 9 e - = 9 Fluoride Ion p + = 9 e - = 10 [http://www.bbc.co.uk/schools/gcsebitesize/img/gcsechem_97.gif]

9 Ions The number of electrons gained or lost is written as the oxidation number or charge of the ion. 9 protons -10 electrons -1 charge or F -1 [http://www.bbc.co.uk/schools/gcsebitesize/img/gcsechem_97.gif]

10 Ions Is there a pattern to the ions? No true pattern No compounds or ions!

11 Ions Example: How many p +, n, e - are there in Ca +2 ? Protons = 20 Neutrons = 20 Electrons = 18

12 Ions Example: How many p +, n, e - are there in P -3 ? Protons = 15 Neutrons = 16 Electrons = 18


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