1. Launch: 11/6
 Grab your binder and immediately take a seat!
 Place homework (practice questions) on desk
1. Draw the correct Lewis structures for the following
atoms. Be sure to use the 3-steps!
i. HI
ii. PH3
iii. O2

2. Schedule
 We have an exam on Tuesday!
 Only today and Monday left for review.
 We don’t have time to waste!
 Follow our 7 class rules
 You may not use inappropriate language
 If you have a question, ask!

3. Chemical Bonding Review
Mr. Heffner
11/6/09

4. What is the octet rule?
 The octet rule is…
 all atoms want to have 8 valence electrons
 except H and He

5. Why do atoms form
chemical bonds?
 Atoms form chemical bonds…
 to get 8 valence electrons (like the noble gases)
Chemical Bond
O
H H

6. What are the 3 types of bonds?
1. Ionic bonds
 formed between a metal and a nonmetal
 electrons are transferred
 metal loses electron  cation (+)
 nonmetal gains electron  anion (–)
 stick together because electrostatic attraction
 called “salts”
Cations
attracted to
neighboring
anions

7. Example #1
In an ionic bond, what ion would O form?
 Step #1: metal or nonmetal?
Metals

8. Example #1
Example: In an ionic bond, what ion would O form?
 Step #1: metal or nonmetal?
 nonmetal = anion (–)
 gain electron

9. Example #1
In an ionic bond, what ion would O form?
 Step 2: how far away from the noble gases?
2 spaces away

10. Example #1
In an ionic bond, what ion would O form?
 Step #3: write out the symbol and charge
 Step #1: anion (–)
 Step #2: 2 spaces away
2–
O
Is it a cation or an anion?

11. What are the 3 types of bonds?
2. Covalent bonds
 formed between a nonmetal and a nonmetal
 electrons are shared
 2 types of covalent bonds
 non-polar: equally
 polar: unequally

12. What are the 3 types of bonds?
3. Metallic bonds
 formed between a metal and a metal
 electrons are shared
 “free in the sea”

13. Example #2
Classify C2H4O2 as either an ionic, covalent, or metallic
compound.
 Step #1: identify the atoms
 C = carbon (X2)
 H = hydrogen (X4)
 O = oxygen (X2)

14. Example #2
Classify C2H4O2 as either an ionic, covalent, or metallic
compound.
 Step #2: metal or nonmetal?
Metals

15. Example #2
Classify C2H4O2 as either an ionic, covalent, or metallic
compound.
 Step #3: match the combination
 a nonmetal, a nonmetal, and a nonmetal
Covalent

16. Homework
 Finish the review worksheet
 Study hard for Tuesday’s exam!