1. Goal for next time = ___% if you made your goal must improve by 1
Goal Setting
Unit 5 Test = ___%
I studied by …
Goal for next time = ___% if you made your goal must improve by 1
Next time I will study by…
Day 4 4-1

2. Draw the Lewis dot structure for berryllium bonded to fluorine.
Q of the Day
Day 2 4-9
Draw the Lewis dot structure for berryllium bonded to fluorine.
2. Ionic bonds most commonly form between???
3. Where would you find elements that form cations on the periodic table?

3. How do elements combine to form compounds?
Objective
How do elements combine to form compounds?

4. Covalent Bonding
Covalent bonds -
Chemical bonds that result from the sharing of electron pairs between two atoms
But why bond?

5. What is the difference between ionic and covalent bonds?
Ionic bonding
the result of electrical attraction
Unequal charge distribution
covalent bonding
based on sharing of electrons
Equal charge distribution

6. Ionic Network (Crystal) Bonds Compounds
Covalent Bonding
Ionic Ionic
Ionic Network (Crystal)
Bonds Compounds - - + - + + - - +
Covalent Molecular
Individual molecules
Bonds Compounds
H-O-H
O=C=O

7. Ionic Compounds
Most are solids at room temperature Stronger bonds Hard, crystalline, and brittle Higher melting and boiling points Dissolve in water Good conductors (liquid state) – electrolytes Higher electronegative differences

8. Covalent Compounds
Weak interparticle forces Many are liquids or gases (H2O, CO2) Low melting / boiling points Not good conductors

9. Covalent Bonding
Molecule – group of atoms united by covalent bonds (molecules = molecular substance)
FORMULAS
Ionic -
Empirical = ratio
Molecular -
How many atoms in a single molecule (not always a simplified ratio, sugar = C6H12O6)

10. Covalent Bonding
FORMULAS
Ionic -
Empirical = ratio
Molecular -
How many atoms in a single molecule (not always a simplified ratio, sugar = C6H12O6)
Structural -
Specifies which atoms are bonded to each other (take o. chem)

11. Covalent Bonding
Molecular Element – molecule of atoms of same element – NOT a compound -like O2, Cl2, O3

12. Due tomorrow!!! Assignment Review sections 7.2 + 7.3 and complete #s
13, 17, and 18 on
page 207 AND #s
20-22 and 25 on
page 212
Due tomorrow!!!

13. ? of the day
Day
How are covalent and ionic compounds different?
2. Where would you find elements that form anions on the periodic table?

14. Revisiting Lewis structures:
Covalent Bonding
Revisiting Lewis structures:
Do individual structures first
As a general rule of thumb – most electroneg. Element goes in the middle (trial and error)

15. Covalent Bonding
Multiple Bonds F2 O2 N2
CH4
C2H6
C2H4
CO2

16. Review
In a thunder storm you are safe in the car because the rubber tires will NOT conduct electricity. What type of substance do you think rubber is?

17. What type of bond: Cl—Cl ?
Review
What type of bond: Cl—Cl ?

18. Chapter Quiz will be on Thursday 4-16!!!
Announcement
Chapter Quiz will be on Thursday 4-16!!!

19. Due NOW!!! Assignment Review sections 7.2 + 7.3 and complete #s
13, 17, and 18 on
page 207 AND #s
20-22 and 25 on
page 212
Due NOW!!!

20. Nate’s girl does not belong to Nate
Question of the Day
Day
SirWalter,
Nate’s girl does not belong to Nate
but she would like to be your prom date
???
SirWalter Melendez will you go to the prom with Eunice Appiah?

21. ? of the day
Day
Lewis Dot structure for CO2.
2. In an ionic bond electrons are ____, but in covalent bonds electrons are ____.

22. Question of the Day = ATB
The bond formed between K and F would be _______ because …
______ compounds break apart into ______ when dissolved in water and conduct electricity.
Ionic
Ionic
ions

23. Covalent Bonding
Covalent bond in which bonding electrons are shared equally by bonded atoms – balanced distribution of electrical charge
Nonpolar Covalent bond -
Covalent bond in which bonding electrons are shared unequally by bonded atoms – Uneven distribution of electrical charge
Polar Covalent bond -

24. Nonpolar Covalent bonds
Covalent Bonding
Covalent bonds can be polar or nonpolar
Transfer elecs.
Share elecs.
Ionic bonds
Polar Covalent bonds
Nonpolar Covalent bonds

25. What is the difference between polar and nonpolar covalent bonds?
Moving in the ionic direction
Atoms attract shared electrons unequally
nonpolar
Purely covalent
Atoms attract shared electrons equally

26. The Fight for Electrons – bonding as a tug-of-war
Covalent
Tie Br H
Polar Covalent
2.8
2.1

27. The Fight for Electrons – bonding as a tug-of-warCl Na
Ionic
3.0
0.9

28. Br Rb Ionic Bonds Bonds are NEVER purely ionic!!!
Bonds are purely covalent when … Br Rb

29. Practice: Covalent Bonding Rb and Cl H and O F and F C and O H and F
Calculate
Predict only
Rb and Cl
H and O
F and F
C and O
H and F

30. Chapter Quiz will be on Tuesday 4-21!!!
Announcement
Chapter Quiz will be on Tuesday 4-21!!!
REVIEW

31. Assignment period 9 only We will have a quiz on the reading tomorrow
#s 27, and 29-36, 38
on page 214
Read sections 7.1, 8.1 and 8.2
We will have a quiz on the reading tomorrow

32. Extended Question of the Day
3. What type of bonds are formed (ionic, polar, or nonpolar):
Mg and O = ________ bond
two atoms of H = ________ bond
H and Cl = ________ bond
ionic
nonpolar
polar

33. Extended Question of the Day
4. What type of bonds are formed (single, double, or triple):
two atoms of O = _______ bond
Rb and F = ________ bond
N and P = _______ bond
double
single
triple

34. Review
This morning I slipped in some mystery liquid in the kitchen with the toaster, luckily for me I was not electrocuted, based on this do you think I was in an ionic or molecular compound?

35. Ionic Bonding http://www.youtube.com/watch?v=QqjcCvzWwww

36. Quick Talk
Electrostatic force
Anion
Ionic bond
Malleable
Alloy
Cation

37. Quick Draw
Electrostatic force
Anion
Ionic bond
Malleable
Covalent compound
Cation