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!