electrons and chemical bonding spring 2013 day 4

You Will Need:1. Pencil, Text Book- Periodic Table, 2. Ionic & Covalent Bonding Pages 1-8

– Due Tomorrow4. Retakes for Test #2 – Starts Today

Please SCHEDULE:1. To take Retake Test #2

• 129/185 or lower2. Starts Today3. Please make sure to make an

appt.4. Last day – Tues, April 9th.

You will need 100 3 x 5 cards1. 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 &

answers2. Due at the beginning of class on

Friday3. Quiz on Friday

1. The type of bond formed by KF? Why?

2. The type of bond formed when one or more pairs of electrons are shared?

3. What type of elements form ionic bonds?

4. The MOST reactive Metals on the Periodic Table are the ______________.

5. What are positive ions called?

6. The ions that make up an ionic compound are bonded in a repeating three-dimensional patter called a _________ __________.

7. This family on the Periodic Table rarely form bonds with any other element?

8. How are Isotopes different than Ions?

9. What is the valence of Bromine? How do you know?

10. Will Magnesium tend to give or gain valence electrons? Why?

11. What charge does Iodine have in the compound KI? Why?

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

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 factorWhat 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 factorH = 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

Task List:1)Ionic and Covalent Bonding –

Due Tomorrow2)STAR Cards #1-30 – on 3x5

cards – Due Tomorrow at the beginning of class

3)Study Cards 1-30 for Quiz Tomorrow

4) Check grades for accuracy and all assignments completed

Homework:1)Ionic and Covalent Bonding –

Due Tomorrow2)STAR Cards #1-30 – on 3x5

cards – Due Tomorrow at the beginning of class

3)Study Cards 1-30 for Quiz Tomorrow