WE'RE ALMOST THERE
Don't forget that my Final Review session is tomorrow, Wednesday from 4-6pm in YH 4232!!
I will be giving special focus to quantum questions, specifically relating to problems with De Broglie's equation. Can't wait to see y'all there
- Andrew
Andrew La's Week 10 FINAL REVIEW SESSION
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Chem_Mod
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Chem_Mod
- Posts: 24909
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Re: Andrew La's Week 10 FINAL REVIEW SESSION
Here is the problems I will go over during the review session tomorrow! Since it is a review session, I will jump right in to working through these problems at the start of the session, so please take a look at it and try to work on some of it before the session tomorrow :)
Come with questions!
After I finish this worksheet (which will take ~1 hour), I will open up the floor to requests for specific topics or a more general review.
Thanks guys!
- Andrew
If you have an questions, please do not hesitate to email me any time at andrew123@ucla.edu.
Come with questions!
After I finish this worksheet (which will take ~1 hour), I will open up the floor to requests for specific topics or a more general review.
Thanks guys!
- Andrew
Andrew La Week 10 Workshop.pdf- (3.23 MiB) Downloaded 178 times
If you have an questions, please do not hesitate to email me any time at andrew123@ucla.edu.
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Chem_Mod
- Posts: 24909
- Joined: Thu Aug 04, 2011 1:53 pm
- Has upvoted: 1269 times
Re: Andrew La's Week 10 FINAL REVIEW SESSION
Hi everyone ~
Here is the answer key to this week's worksheet, I really enjoyed seeing so many faces at my review session. Keep up the great work!
I'm paranoid that my calculator skills are wrong so if anyone gets a different answer than my key, PLEASE email me at andrew123@ucla.edu :))))
Best,
Andrew La
Here is the answer key to this week's worksheet, I really enjoyed seeing so many faces at my review session. Keep up the great work!
- Andrew La Week 10 Workshop [key].pdf
- (3.97 MiB) Downloaded 92 times
I'm paranoid that my calculator skills are wrong so if anyone gets a different answer than my key, PLEASE email me at andrew123@ucla.edu :))))
Best,
Andrew La
-
Chem_Mod
- Posts: 24909
- Joined: Thu Aug 04, 2011 1:53 pm
- Has upvoted: 1269 times
Re: Andrew La's Week 10 FINAL REVIEW SESSION
Hi everyone, thank you so much for an amazing quarter. As this was my first quarter as a UA, I could not have asked for a better experience. I look forward to seeing more of you next quarter!!
For this upcoming final, I wanted to compile a list of what I felt were the most important things to remember. I'm sure everyone is strong with the basics, so I won't really talk about the general stuff (i.e., y'all don't need me to teach you guys over text how to draw a lewis dot structure right), but instead I'll write here the stuff that if you're strong with the content and just want a refresher on the trickier / more nuanced stuff, here's the place to go. I'll also tailor these to the stuff that I struggled on when I took this class too.
1. Atoms can have an expanded octet. While this may be a simple concept to remember, it might be easy to forget this concept because of exam day jitters, lack of sleep, or simply brain farting (totally not speaking from experience). When you see molecules with P, S, or Xe, they're probably very happy with 10, 12, and 12 e- respectively.
Also, Boron is almost always happy with 6 valence electrons.
2. Remember your exceptions: here are the ones that I tend to forget most
- Ionization energy. Group 2 and Group 15 elements have higher first ionization energies than Group 3 and Group 6 elements, contrary to the trend. This is due to full and half full electron configurations. Common examples used are Al having a lower ionization energy than Mg and O having a lower ionization energy than C.
- Electronegativity is NOT electron affinity. Electronegativity is how strong atom pull electrons IN a molecule, while electron affinity describes the ability of an ISOLATED atom to accept an electron. In practice, they follow very similar trends, although one major exception is the case of Flourine vs Chlorine. Flourine has a higher electronegativity than chlorine due to a smaller size but a lower electron affinity because Flourine's 1s orbital shields and provides repulsion to its valence shell. This is because the 2s valence shell is pretty small and while the nucleus exerts a strong attraction to the valence electrons, the 2p's proximity to the 1s orbital creates more repulsion.
- When writing electron configuration, remember that metals prefer to have half filled or completely filled D orbitals instead of 4s or 5s orbitals. This means that the electron configuration of Cr would not be [Ar] 3d4 4s2, but would be [Ar]3d5 4s1. Cu would not be [Ar] 3d8 4s2, it would instead be [Ar] 3d10.
3. For the quantum questions, please check your units and make sure they cancel out and leave you with the desired units. If it's asking about wavelength, expect m (or nm). If it's asking about velocity, expect your units to cancel out into m/s. Remember that the units for Joules is kg * m2/s2. If it's confusing, just remember that the formula for kinetic energy (also in J) is 1/2mv2. The units are m (kg), and v (m/s)2, which turns into kg * m2 / s2. Also be aware of the question being given in different units (pm instead of m, nm instead of m, grams instead of kg, minutes instead of seconds). Mass ALWAYS needs to be in meters, speed ALWAYS needs to be in meters/sec.
4. Memorize your ligands, ions, polyatomic ions, and strong / weak acids and bases.
5. Please sleep enough before the exam. You know more than you think, and if you've managed to read to the bottom of this post (and I'm sure many others), you no doubt have had lots of good practice.
Best of luck on the final! As always, PLEASE email me at andrew123@ucla.edu if you have any questions (not just about chemistry, but anything - basketball, science, classes). If anything I said here does not make sense, I will make time to help you guys.
- Andrew La
6. Enjoy your winter break. As this might be many of yall's first quarters in college, spend a lot of good time this break with your parents and family, they miss you.
For this upcoming final, I wanted to compile a list of what I felt were the most important things to remember. I'm sure everyone is strong with the basics, so I won't really talk about the general stuff (i.e., y'all don't need me to teach you guys over text how to draw a lewis dot structure right), but instead I'll write here the stuff that if you're strong with the content and just want a refresher on the trickier / more nuanced stuff, here's the place to go. I'll also tailor these to the stuff that I struggled on when I took this class too.
1. Atoms can have an expanded octet. While this may be a simple concept to remember, it might be easy to forget this concept because of exam day jitters, lack of sleep, or simply brain farting (totally not speaking from experience). When you see molecules with P, S, or Xe, they're probably very happy with 10, 12, and 12 e- respectively.
Also, Boron is almost always happy with 6 valence electrons.
2. Remember your exceptions: here are the ones that I tend to forget most
- Ionization energy. Group 2 and Group 15 elements have higher first ionization energies than Group 3 and Group 6 elements, contrary to the trend. This is due to full and half full electron configurations. Common examples used are Al having a lower ionization energy than Mg and O having a lower ionization energy than C.
- Electronegativity is NOT electron affinity. Electronegativity is how strong atom pull electrons IN a molecule, while electron affinity describes the ability of an ISOLATED atom to accept an electron. In practice, they follow very similar trends, although one major exception is the case of Flourine vs Chlorine. Flourine has a higher electronegativity than chlorine due to a smaller size but a lower electron affinity because Flourine's 1s orbital shields and provides repulsion to its valence shell. This is because the 2s valence shell is pretty small and while the nucleus exerts a strong attraction to the valence electrons, the 2p's proximity to the 1s orbital creates more repulsion.
- When writing electron configuration, remember that metals prefer to have half filled or completely filled D orbitals instead of 4s or 5s orbitals. This means that the electron configuration of Cr would not be [Ar] 3d4 4s2, but would be [Ar]3d5 4s1. Cu would not be [Ar] 3d8 4s2, it would instead be [Ar] 3d10.
3. For the quantum questions, please check your units and make sure they cancel out and leave you with the desired units. If it's asking about wavelength, expect m (or nm). If it's asking about velocity, expect your units to cancel out into m/s. Remember that the units for Joules is kg * m2/s2. If it's confusing, just remember that the formula for kinetic energy (also in J) is 1/2mv2. The units are m (kg), and v (m/s)2, which turns into kg * m2 / s2. Also be aware of the question being given in different units (pm instead of m, nm instead of m, grams instead of kg, minutes instead of seconds). Mass ALWAYS needs to be in meters, speed ALWAYS needs to be in meters/sec.
4. Memorize your ligands, ions, polyatomic ions, and strong / weak acids and bases.
5. Please sleep enough before the exam. You know more than you think, and if you've managed to read to the bottom of this post (and I'm sure many others), you no doubt have had lots of good practice.
Best of luck on the final! As always, PLEASE email me at andrew123@ucla.edu if you have any questions (not just about chemistry, but anything - basketball, science, classes). If anything I said here does not make sense, I will make time to help you guys.
- Andrew La
6. Enjoy your winter break. As this might be many of yall's first quarters in college, spend a lot of good time this break with your parents and family, they miss you.
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