Electrons and chemical bonding spring 2013 day 3

You Will Need:1. Pencil, Text Book- Periodic Table,

Colored Pencils2. Ionic & Covalent Bonding 1 pages-2

sides (pgs 7 & 8 of packet)4. Test #2 Signature and Corrections–

Due NOW

Please SCHEDULE:

1. To take Retake Test #2

• 129/185 or lower

2. Starts Thursday of this week

3. Parent Signature and Corrections – due Wed.

You will need 100 3 x 5 cards

1. Print out Questions & Answers hyperlinked on Learning Point

• Glue, Staple or Tape Questions on the Front and Answers on the back

OR

• You can write out the questions & answers

2. Due at the beginning of class on Friday

3. Quiz on Friday

Forming Sodium Chloridehttp://www.youtube.com/watch?v=2mzDwgyk6QM

Before (pg. 233) After

Questions:1)Why does Sodium become an Ion? 2)Is it Positive or Negative? Why?3)Why does Chlorine become an Ion? 4)Is it Positive or Negative? Why?

Questions:1)Why do Sodium and Chlorine bond?2)What is the overall charge of the compound?3)Does NaCl have the same characteristics as Na and Cl?4)What are some unique characteristics of NaCl?

Question Answer

Characteristics of Covalent bonds • Valance electrons are shared• More often between nonmetal• Low melting and boiling point• Free flowing but can be brittle• Form molecules• Do not have a specific shape - flexible

View Video – Covalent Bonding – hyperlinked on Learning Point.http://www.youtube.com/watch?v=1wpDicW_MQQ

How many types of covalent bonds are shown in the video clip? ______

C6H10O5

C12H22O11

Molecule Illustration Explanation Electron Dot (Color Code each element)

1. What kind of bond does Hydrogen & Oxygen make?

2. How do you know?3. Why does one Oxygen

bond with two Hydrogen atoms?

http://www.youtube.com/watch?v=ulyopnxjAZ8&feature=relmfu Drawing Lewis Dot Diagram Bonds

P=8N=8

P=1N=0

P=1N=0

Element Bohr Model Lewis Dot (Symbol + Valence)

Lithium

Atomic #

Atomic Mass – Atomic #

Neon

Atomic #

Atomic Mass – Atomic #

Row =

Electrons= Protons =

Neutrons =

2

3-3+

7-3=

4

P = 3N = 4

21

Li

Row =

Electrons= Protons =

Neutrons =

P =10N =10 Ne

10

10-10+

20-10

10

28

P=8N=8

P=1N=0

P=1N=0

How do we determine the type of bond in a compound?

• Identify class of elements• Same class usually covalent• Opposite class usually ionic

• Calculate the electronegativity factor

What is ELECTRONEGATIVITY? A measure of how much an element wants an electron

How do you know the electronegativity factor of an element?

Look it up (see next slide)

What are the determining values for each type of bond?

0-0.4 = Non-polar covalent

.41-2.0 = Polar covalent

>2.0 = Ionic

http://www.youtube.com/watch?v=7DjsD7Hcd9U

http://www.tutor-homework.com/Chemistry_Help/electronegativity_table/electronegativity.html

ELECTRONEGATIVITY VALUES

0-0.4 = Non-polar covalent.41-2.0 = Polar covalent>2.0 = Ionic

Let’s try a couple:

P=8N=8

P=1N=0

P=1N=0

H2OCalculate the electronegativity factor

H = 2.2O = 3.44

3.44 – 2.2 = 1.24

NaCl

0-0.4 = Non-polar covalent.41-2.0 = Polar covalent

>2.0 = Ionic

Polar Covalent

Ionic

Na = .93Cl = 3.16

3.16 - .93 = 2.23

Homework:

1)Ionic and Covalent Bonding – Due Tomorrow

2)STAR Cards #1-30 – on 3x5 cards – Due Friday at the beginning of class

3)Study Cards 1-30 for Quiz on Friday