DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
Moderators: Chem_Mod, Chem_Admin
-
- Posts: 101
- Joined: Fri Sep 28, 2018 12:27 am
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
Why does LiCl exhibit greater ionic character than LiBr?
-
- Posts: 33
- Joined: Tue Oct 02, 2018 12:16 am
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
On Worksheet 6, #1 it asks to draw the most stable lewis structure for nitrogen dioxide (NO2), to determine the shape, and determine whether or not it it polar. In the key, the lewis structure is drawn with one single bond between nitrogen and oxygen and one double bond between nitrogen and the other oxygen atom and one single lone electron on nitrogen - this results in a formal charge of +1 on nitrogen and -1 on the oxygen that is bonded by a single bond. Wouldn't the most stable lewis structure be one with no formal charges at all, such as when both oxygens are double bonded to the nitrogen and with a single lone electron on the nitrogen?
-
- Posts: 23858
- Joined: Thu Aug 04, 2011 1:53 pm
- Has upvoted: 1253 times
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
Hello students!
Hope everyone had lots of good food and caught up on sleep over Thanksgiving! Below you will find this Sunday's session worksheet attached. Since your final is on the Sunday before finals week, this week will unfortunately be the last peer learning session with me :'( (Unless you're taking 14B with Dr. Lavelle again!!) Anyways, we will finish reviewing the rest of the concepts of the course (coordination compounds and acids/bases) so there are quite a lot to cover this weekend.
Hope to see you all at the last session!
-Karen
Hope everyone had lots of good food and caught up on sleep over Thanksgiving! Below you will find this Sunday's session worksheet attached. Since your final is on the Sunday before finals week, this week will unfortunately be the last peer learning session with me :'( (Unless you're taking 14B with Dr. Lavelle again!!) Anyways, we will finish reviewing the rest of the concepts of the course (coordination compounds and acids/bases) so there are quite a lot to cover this weekend.
Hope to see you all at the last session!
-Karen
- Attachments
-
- Worksheet 9 F18 - Coordination Compounds, Acids_Bases.pdf
- (494.37 KiB) Downloaded 373 times
-
- Posts: 23858
- Joined: Thu Aug 04, 2011 1:53 pm
- Has upvoted: 1253 times
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
Joussie Camacho 4I wrote:On Worksheet 6, #1 it asks to draw the most stable lewis structure for nitrogen dioxide (NO2), to determine the shape, and determine whether or not it it polar. In the key, the lewis structure is drawn with one single bond between nitrogen and oxygen and one double bond between nitrogen and the other oxygen atom and one single lone electron on nitrogen - this results in a formal charge of +1 on nitrogen and -1 on the oxygen that is bonded by a single bond. Wouldn't the most stable lewis structure be one with no formal charges at all, such as when both oxygens are double bonded to the nitrogen and with a single lone electron on the nitrogen?
If the structure is drawn with 2 double bonds and a single lone electron, the entire molecule has a +1 charge, but the question asks for a neutral NO2.
-
- Posts: 23858
- Joined: Thu Aug 04, 2011 1:53 pm
- Has upvoted: 1253 times
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
Isabel Nakoud 4D wrote:Why does LiCl exhibit greater ionic character than LiBr?
Cl is smaller and is more electronegative than Br, so it will attract electrons better towards itself, leading to greater separation of charge, thus, greater ionic character.
-
- Posts: 37
- Joined: Wed Jun 13, 2018 3:00 am
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
Are these worksheets based on the homework and test problems directly or are they independent?
-
- Posts: 33
- Joined: Tue Oct 02, 2018 12:16 am
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
Chem_Mod wrote:Joussie Camacho 4I wrote:On Worksheet 6, #1 it asks to draw the most stable lewis structure for nitrogen dioxide (NO2), to determine the shape, and determine whether or not it it polar. In the key, the lewis structure is drawn with one single bond between nitrogen and oxygen and one double bond between nitrogen and the other oxygen atom and one single lone electron on nitrogen - this results in a formal charge of +1 on nitrogen and -1 on the oxygen that is bonded by a single bond. Wouldn't the most stable lewis structure be one with no formal charges at all, such as when both oxygens are double bonded to the nitrogen and with a single lone electron on the nitrogen?
If the structure is drawn with 2 double bonds and a single lone electron, the entire molecule has a +1 charge, but the question asks for a neutral NO2.
Where is the overall +1 charge coming from? Isn't the formal charge on nitrogen 0 when it's double bonded to each oxygen? (5 valence electrons - 5 (4 from double bonds and 1 from the one electron))
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
Is there no worksheet 8 for this weeks workshop?
-
- Posts: 101
- Joined: Fri Apr 06, 2018 11:05 am
-
- Posts: 37
- Joined: Fri Sep 28, 2018 12:22 am
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
Hi, are you going to post a final review packet? Thanks!
-
- Posts: 23858
- Joined: Thu Aug 04, 2011 1:53 pm
- Has upvoted: 1253 times
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
Here is the answer key to the very last worksheet! There is no worksheet 8 because no session was held during week 8 due to thanksgiving break.
For #4 on the acids and bases section, see if this helps: [img] [/img]
IMPORTANT******: NAMING of coordination compounds WILL be on your final exam. I apologize for the confusion. IN ADDITION, you will need to know how to calculate the pH of STRONG ACIDS AND BASES. pH = -log[H+] and pOH = -log [OH-]. pH + pOH = 14. Sorry I am still adjusting to the new curriculum change.
There will be additional review sessions hosted by TAs and other UAs this week so utilize them if needed! I highly suggest going to a review session on coordination compounds if you still have trouble with that topic (definitely my personal weaker topic). I won't be holding a comprehensive review session so this worksheet will be the LAST one for this quarter. You can review my past 9 worksheets to make sure you still remember how to do problems from older material.
Good luck on finals and happy holidays!!!!
All the best,
Karen Leung
For #4 on the acids and bases section, see if this helps: [img] [/img]
IMPORTANT******: NAMING of coordination compounds WILL be on your final exam. I apologize for the confusion. IN ADDITION, you will need to know how to calculate the pH of STRONG ACIDS AND BASES. pH = -log[H+] and pOH = -log [OH-]. pH + pOH = 14. Sorry I am still adjusting to the new curriculum change.
There will be additional review sessions hosted by TAs and other UAs this week so utilize them if needed! I highly suggest going to a review session on coordination compounds if you still have trouble with that topic (definitely my personal weaker topic). I won't be holding a comprehensive review session so this worksheet will be the LAST one for this quarter. You can review my past 9 worksheets to make sure you still remember how to do problems from older material.
Good luck on finals and happy holidays!!!!
All the best,
Karen Leung
- Attachments
-
- Worksheet 9 F18 KEY - Coordination Compounds, Acids_Bases.pdf
- (495.57 KiB) Downloaded 332 times
-
- Posts: 78
- Joined: Fri Sep 28, 2018 12:17 am
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
Im just wondering why the tail has a -1 charge since for me when I calculated the formal charges of the nitrogens connected to Co I got +1, +1, +1, +1, and 0
Wouldnt that give an overall +4 charge for the tail?
Wouldnt that give an overall +4 charge for the tail?
Last edited by Kenan Kherallah 2C on Wed Dec 05, 2018 6:19 pm, edited 1 time in total.
-
- Posts: 61
- Joined: Fri Sep 28, 2018 12:25 am
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
Hi! Thank you for the workshop and answering all of my burning questions this quarter. I appreciate it!
-
- Posts: 61
- Joined: Fri Sep 28, 2018 12:25 am
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
Hi! Thank you for the workshop and answering all of my burning questions this quarter. I appreciate it!
-
- Posts: 44
- Joined: Fri Sep 28, 2018 12:26 am
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
How do you go about doing #3 in the acid/base section?
-
- Posts: 51
- Joined: Thu Oct 02, 2014 3:00 am
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
Hi, is there a worksheet for this past weekend? Thank you!
-
- Posts: 51
- Joined: Thu Oct 02, 2014 3:00 am
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
Disregard my previous post, for some reason it hadn't downloaded all the comments in the thread. I just saw worksheet 9!
-
- Posts: 33
- Joined: Tue Oct 02, 2018 12:16 am
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
Angela Cordova 3F wrote:These worksheets have helped me so much on the tests, will there be any covering the topics for Test 3?
Worksheets 6 and 7 above pretty much cover the same topics that Test 3 did!
-
- Posts: 9
- Joined: Fri Sep 29, 2017 7:05 am
-
- Posts: 78
- Joined: Fri Sep 28, 2018 12:17 am
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
Does anyone know how to do 2B please on ws 9
-
- Posts: 51
- Joined: Thu Oct 02, 2014 3:00 am
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
Kenan Kherallah 1A wrote:Im just wondering why the tail has a -1 charge since for me when I calculated the formal charges of the nitrogens connected to Co I got +1, +1, +1, +1, and 0
Wouldnt that give an overall +4 charge for the tail?
I also have the same confusion can some explain please?
-
- Posts: 51
- Joined: Thu Oct 02, 2014 3:00 am
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
Leela_Mohan3L wrote:How do you go about doing #3 in the acid/base section?
Yes, can someone explain how to solve #3 on the second page of worksheet 9 please?
-
- Posts: 67
- Joined: Fri Sep 28, 2018 12:18 am
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
On Worksheet 9, question #6, why would acid 2 be stronger than acid 4?
-
- Posts: 30
- Joined: Fri Sep 28, 2018 12:28 am
-
- Posts: 65
- Joined: Fri Sep 28, 2018 12:17 am
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
will there be more worksheets for the recently covered material like acids and bases and coordination compounds ? Thanks
-
- Posts: 89
- Joined: Fri Sep 28, 2018 12:27 am
- Been upvoted: 1 time
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
Carissa Young 1C wrote:will there be more worksheets for the recently covered material like acids and bases and coordination compounds ? Thanks
I think this last worksheet was the last one since our final is on Sunday when there would normally be a session
-
- Posts: 67
- Joined: Fri Sep 28, 2018 12:18 am
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
For Week 9 worksheet #5, why cant H3O+ and H2O neutralize an added base? And why cant H2O neutralize an acid and be potentially amphoteric?
-
- Posts: 23858
- Joined: Thu Aug 04, 2011 1:53 pm
- Has upvoted: 1253 times
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
Kenan Kherallah 1A wrote:Im just wondering why the tail has a -1 charge since for me when I calculated the formal charges of the nitrogens connected to Co I got +1, +1, +1, +1, and 0
Wouldnt that give an overall +4 charge for the tail?
For the tail itself, you need to think about it when it's removed from the Co, so break the bond and give it its respective lone pairs, the charge should be 0 + 0 + 0 +0 + -1 = -1.
Leela_Mohan3L wrote:How do you go about doing #3 in the acid/base section?
The question tells you that you start with HB+, and not HB, and you also know that B is a weak base. Thus, you need to write an equation that turns HB+ into B. Then, since B is a weak base, we know HB+ is a weak acid, and from there we need to think about what acids do and what bases do. What ions do acids release and what constitutes a base?
annabel 1F wrote:For Week 9 worksheet #5, why cant H3O+ and H2O neutralize an added base? And why cant H2O neutralize an acid and be potentially amphoteric?
Technically it can, but I was looking for something less obvious and related to the bicarbonate buffering system. On the exam, you may want to avoid writing down the too obvious answers for problems like these.
-
- Posts: 23858
- Joined: Thu Aug 04, 2011 1:53 pm
- Has upvoted: 1253 times
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
Karishma_1G wrote:On Worksheet 9, question #6, why would acid 2 be stronger than acid 4?
The CH3 groups in acid 4 has electron donating properties, which deems it a stronger acid by the electronegativity trend.
-
- Posts: 23858
- Joined: Thu Aug 04, 2011 1:53 pm
- Has upvoted: 1253 times
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
Karishma_1G wrote:On Worksheet 9, question #6, why would acid 2 be stronger than acid 4?
The CH3 groups in acid 4 has electron donating properties, which deems it a stronger acid by the electronegativity trend.
-
- Posts: 28
- Joined: Fri Sep 28, 2018 12:19 am
-
- Posts: 48
- Joined: Fri Sep 28, 2018 12:16 am
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
Chem_Mod wrote: For the tail itself, you need to think about it when it's removed from the Co, so break the bond and give it its respective lone pairs, the charge should be 0 + 0 + 0 +0 + -1 = -1.
For the N with formal charge -1, can you please explain why is it -1 instead of +1? When it's removed from the Co, it should be bonded with two other atoms, and have a lone pair. Is it because there is another lone pair that is not shown?
Thank you so much! :-)
-
- Posts: 66
- Joined: Fri Sep 28, 2018 12:28 am
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
Thanks Karen for the helpful worksheets!
-
- Posts: 57
- Joined: Fri Sep 28, 2018 12:16 am
-
- Posts: 59
- Joined: Fri Sep 28, 2018 12:18 am
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
For worksheet 9 #2, why is the answer BF3? How can Cl- act as a lewis base?
-
- Posts: 34
- Joined: Fri Sep 28, 2018 12:25 am
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen)
Thank you so much for everything!! These worksheets were a life saver
Return to “Administrative Questions and Class Announcements”
Who is online
Users browsing this forum: No registered users and 18 guests