## Lydon's Week 8 Learning Session

This forum topic is for students to self-organize study groups, etc.

Shimei_2F
Posts: 100
Joined: Fri Aug 09, 2019 12:17 am

### Lydon's Week 8 Learning Session

Does anyone have the answers to Lydon's worksheet this week?

Caitlyn Tran 2E
Posts: 100
Joined: Fri Aug 09, 2019 12:15 am

### Re: Lydon's Week 8 Learning Session

You can probably look up the different Lewis structures. Here are some of the answers I wrote down:
2. $AX_{4}E$
3. seesaw
4. cannot be determined; might be able to put slightly <120 degrees or slightly <90 degrees
6. $AX_{2}E_{3}$
7. linear
8. nonpolar
9. 180 degrees
11. $AX_{4}$
12. tetrahedral
13. polar
14. 109.5 degrees
16. 9 sigma bonds, 3 pi bonds
17. 7
18. b=c<e<a<d
19. Increasing molar mass means there is an increase in size and number of electrons. This means higher polarizability, which means that attractive forces are stronger and harder to break. A higher boiling point is required to break these attractions.
20. Neon because it has weaker IMF
21. Water because it has stronger attractions due to the dipole-dipole interaction between water molecules.
22. HO- because it has a shorter bond length, thus making it stronger
23a. HBr because it has a smaller bond length, thus making it stronger
23b. Depends on whether you look at LDF or dipole-dipole interactions.
24c. HF because it has hydrogen bonding.
25b. Yes (polar)
25c. no
25d. square pyramidal
25e. slightly less than 90 or 180 degrees
26b. The molecule has polar bonds since there are differences in electronegativity between the atoms. Also, the dipoles don't cancel, so the molecule is also polar. The bond angles are slightly less than 120 degrees for the FBF bond angle and slightly greater than 120 degrees for FBCl bond angle because the Cl atom is slightly bigger.
27a. ionic
27b. nonpolar
27c. polar

Hope these help!

Esha Chawla 2E
Posts: 108
Joined: Thu Jul 25, 2019 12:17 am

### Re: Lydon's Week 8 Learning Session

How do we know how many atoms are in the same plane (problem 17)?

PranaviKolla2B
Posts: 114
Joined: Fri Aug 30, 2019 12:17 am

### Re: Lydon's Week 8 Learning Session

Atoms that have pi bonds stay in the same plane I believe.

Anisha Chandra 1K
Posts: 118
Joined: Thu Jul 11, 2019 12:17 am

### Re: Lydon's Week 8 Learning Session

For 26b, how does size of the atoms impact bond angles?