11 6 chemical bonding review
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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
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!
Chemical Bonding Review Mr. Heffner 11/6/09
What is the octet rule? The octet rule is…
all atoms want to have 8 valence electrons except H and He
Why do atoms form chemical bonds?
Atoms form chemical bonds… to get 8 valence electrons (like the noble gases)
H H O
Chemical Bond
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”
What are the 3 types of bonds?
Cations attracted to neighboring anions
In an ionic bond, what ion would O form?
Step #1: metal or nonmetal?
Example #1
Metals
Example: In an ionic bond, what ion would O form?
Step #1: metal or nonmetal? nonmetal = anion (–) gain electron
Example #1
In an ionic bond, what ion would O form?
Step 2: how far away from the noble gases?
Example #1
2 spaces away
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
Example #1
O 2–
Is it a cation or an anion?
2. Covalent bonds formed between a nonmetal and a nonmetal electrons are shared
2 types of covalent bonds non-polar: equally
polar: unequally
What are the 3 types of bonds?
What are the 3 types of bonds? 3. Metallic bonds
formed between a metal and a metal electrons are shared
“free in the sea”
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)
Classify C2H4O2 as either an ionic, covalent, or metallic compound.
Step #2: metal or nonmetal?
Example #2
Metals
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
Homework Finish the review worksheet
Study hard for Tuesday’s exam!