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

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

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

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

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

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) = 4 + 4 (1) = 8 valence e- Learning Target: I can Articulate how atoms bond together through practice and application of the octet rule

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

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

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

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

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

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

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) = 4 + 2 (6) = 16 valence e- Learning Target: I can Articulate how atoms bond together through practice and application of the octet rule

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

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

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

Let’s try it together! March 5, 2018 CO2 3. Apply the octet rule Total sum: 16 -- 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

Let’s try it together! March 5, 2018 CO2 3. Apply the octet rule Total sum: 16 -- 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

Let’s try it together! March 5, 2018 CO2 3. Apply the octet rule Total sum: 16 -- 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

Let’s try it together! March 5, 2018 CO2 3. Apply the octet rule Total sum: 16 -- 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

Let’s try it together! March 5, 2018 CO2 3. Apply the octet rule Total sum: 16 -- 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

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

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

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

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

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

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