1. Lewis dot structures for molecules
March 5, 2018
Lewis dot structures for molecules
Bonding
Learning Target: I can Articulate how atoms bond together through practice and application of the octet rule

2. Do Now (4 min)
March 5, 2018
Learning target: I can draw lewis dot structures for molecules using electronegativity values
Do Now: (Answer on your Do Now Sheet)
Based on what you learned yesterday, what are the three ways that electrons can bond?
Learning Target: I can Articulate how atoms bond together through practice and application of the octet rule

3. Announcement Marking Period 1 ends tomorrow
March 5, 2018
Marking Period 1 ends tomorrow
Parent Teacher conferences:
Thursday 5-7
Friday 12:30 – 2:40
- Half-day on Friday
Learning Target: I can Articulate how atoms bond together through practice and application of the octet rule

4. Lewis Dot
March 5, 2018
Lewis Dot structures show us how electrons are organized around an atom We can also use them to show the electrons around a molecule
Learning Target: I can Articulate how atoms bond together through practice and application of the octet rule

5. Lewis dot structures 4 minutes: Silently and independently
March 5, 2018
4 minutes:
Silently and independently
Read the three steps carefully
Annotate: underline, leave notes
Learning Target: I can Articulate how atoms bond together through practice and application of the octet rule

6. Let’s try it together! CH4 Find the total sum of valence electrons
March 5, 2018
CH4
Find the total sum of valence electrons
Carbon has 4 valence e-
Hydrogen has 1 valence e-
Total sum of valence e- : C + 4 (H) = (1) = 8 valence e-
Learning Target: I can Articulate how atoms bond together through practice and application of the octet rule

7. Let’s try it together! CH4 Draw the molecule
March 5, 2018
CH4
Draw the molecule
Use Table S to find the electronegativity values
Carbon: Hydrogen:
Look at the bullet points, what does it say?
Learning Target: I can Articulate how atoms bond together through practice and application of the octet rule

8. Let’s try it together! CH4 Draw the molecule
March 5, 2018
CH4
Draw the molecule
Since C is the central atom, we put it in the middle C
Learning Target: I can Articulate how atoms bond together through practice and application of the octet rule

9. Let’s try it together! CH4 Draw the molecule
March 5, 2018
CH4
Draw the molecule
Then we can put the 4 Hydrogen’s around C H
H C H
Learning Target: I can Articulate how atoms bond together through practice and application of the octet rule

10. Let’s try it together!
March 5, 2018
CH4 3. Apply the octet rule and duet rule (for H) Total sum: 8 H -- Used for bonds: 8 H C H 0 left over H
Learning Target: I can Articulate how atoms bond together through practice and application of the octet rule

11. Let’s try it together!
March 5, 2018
CH4 3. Apply the octet rule and duet rule (for H) Total sum: 8 H -- Used for bonds: 8 H C H 0 left over H
Needs an octet
Has 4 bonds x 2e- = 8
Needs a duet
Has 1 bond x 2e- = 2
Learning Target: I can Articulate how atoms bond together through practice and application of the octet rule

12. CH4 All rules are satisfied! DONE H H C H
Let’s try it together!
March 5, 2018
CH4 All rules are satisfied! DONE H H C H
Learning Target: I can Articulate how atoms bond together through practice and application of the octet rule

13. Let’s try it together! CO2 Find the total sum of valence electrons
March 5, 2018
CO2
Find the total sum of valence electrons
Carbon has 4 valence e-
Oxygen has 6 valence e-
Total sum of valence e- : C + 2 (O) = (6) = 16 valence e-
Learning Target: I can Articulate how atoms bond together through practice and application of the octet rule

14. Let’s try it together! CO2 Draw the molecule
March 5, 2018
CO2
Draw the molecule
Use Table S to find the electronegativity values
Carbon: Oxygen:
Which is the central atom?
Learning Target: I can Articulate how atoms bond together through practice and application of the octet rule

15. Let’s try it together! CO2 Draw the molecule
March 5, 2018
CO2
Draw the molecule
Since C is the central atom, we put it in the middle C
Learning Target: I can Articulate how atoms bond together through practice and application of the octet rule

16. Let’s try it together! CO2 Draw the molecule
March 5, 2018
CO2
Draw the molecule
Then we can put the 2 Oxygen’s around C
O C O
Learning Target: I can Articulate how atoms bond together through practice and application of the octet rule

17. Let’s try it together!
March 5, 2018
CO2 3. Apply the octet rule Total sum: Used for bonds: 4 O C O 12 left over
Learning Target: I can Articulate how atoms bond together through practice and application of the octet rule

18. Let’s try it together!
March 5, 2018
CO2 3. Apply the octet rule Total sum: Used for bonds: 4 O C O 12 left over
Currently has 1 bond x 2e-, so still needs 6 more e-
we add 3 pairs of e-
Learning Target: I can Articulate how atoms bond together through practice and application of the octet rule

19. Let’s try it together!
March 5, 2018
CO2 3. Apply the octet rule Total sum: Used for bonds: 4 O C O -- lone pairs (e-) : 12 0 left over
Does carbon have 8??
Learning Target: I can Articulate how atoms bond together through practice and application of the octet rule

20. Let’s try it together!
March 5, 2018
CO2 3. Apply the octet rule Total sum: Used for bonds: 6 O C O -- lone pairs (e-) : 10 0 left over
So we’re going to make a double bond
NOT ENOUGH FOR Carbon
Learning Target: I can Articulate how atoms bond together through practice and application of the octet rule

21. Let’s try it together!
March 5, 2018
CO2 3. Apply the octet rule Total sum: Used for bonds: 8 O C O -- lone pairs (e-) : 8 0 left over
Now carbon has 8 too!
Learning Target: I can Articulate how atoms bond together through practice and application of the octet rule

22. Let’s try it together! CO2 DONE! O C O
March 5, 2018
CO2 DONE! O C O
Learning Target: I can Articulate how atoms bond together through practice and application of the octet rule

23. Try it yourself Try the next two by yourself Follow the steps NH3 H2O
March 5, 2018
Try the next two by yourself Follow the steps NH3 H2O
Total number of valence electrons:
Central atom:
Lewis structure:
Total number of valence electrons:
Central atom:
Lewis structure:
Learning Target: I can Articulate how atoms bond together through practice and application of the octet rule

24. In Pairs:
March 5, 2018
N2 H2O O2
Total number of valence electrons:
Central atom:
Lewis structure:
Total number of valence electrons:
Central atom:
Lewis structure:
Total number of valence electrons:
Central atom:
Lewis structure:
Learning Target: I can Articulate how atoms bond together through practice and application of the octet rule

25. In Pairs:
March 5, 2018
O3 CO CO32-
Total number of valence electrons:
Central atom:
Lewis structure:
Total number of valence electrons:
Central atom:
Lewis structure:
Total number of valence electrons:
Central atom:
Lewis structure:
Learning Target: I can Articulate how atoms bond together through practice and application of the octet rule

26. Homework Complete the bottom three questions Due tomorrow
March 5, 2018
Complete the bottom three questions Due tomorrow
Learning Target: I can Articulate how atoms bond together through practice and application of the octet rule

27. March 5, 2018
Exit ticket (3 min)
EXIT TICKET: Complete on a separate sheet of paper Draw the lewis dot structure for F2
Learning Target: I can Articulate how atoms bond together through practice and application of the octet rule