CHEMISTRY COMMUNITY

Ravdeep Warar 2G

I have one more final after this final, and then I'm going back home and hope to relax and spend time with my family.

Ravdeep Warar 2G

I used the one from Sapling and that was very helpful and informative!

Ravdeep Warar 2G

I had issues with is when it was initially posted, but I just tried again, and it worked for me!

Ravdeep Warar 2G

On Dr. Lavelle's website, he said that the final will be "proctored and closed book," so I'm assuming that we will have to join our TA's link, just like for the midterms. I'm sure when we have discussions this week, the TAs will go over their protocol for the final.

Ravdeep Warar 2G

Dr. Lavelle hasn't said anything about us getting points or extra credit for completing the UCLA course evaluations or the Sapling evaluation.

Ravdeep Warar 2G

If you want to go over your midterm 2, then you set up an appointment with your TA, and they will show you your test and can help you understand the answers.

Ravdeep Warar 2G

Personally, I just count the connected atoms, and then count towards the orbitals with the same number. For example, 3 orbitals would be sp2. Another helpful method is that the number of orbitals should correspond with the superscripts added up. So, again, with sp2, p has a superscript of 2 and s ha...

Ravdeep Warar 2G

When I took psychology in high school, my teacher said the best way to prefixes and other words is to come up with a goofy term for it, and studies have shown that mnemonics are greatly beneficial and actually work.

Ravdeep Warar 2G

I know it was said that we should reference the list in the book, but no one has said anything about memorizing the list, correct me if I'm wrong!

Ravdeep Warar 2G

In the lecture, it was said that both are acceptable, but since Dr. Lavelle and our homework are using -o, I will stick to that.

Ravdeep Warar 2G

Darren1e wrote:Also, how can you calculate what grade you need on the final to get an A?

Rogerhub is an option or you can simply calculate what you need from the point total breakup listed on the syllabus. There are a total of 500 points for this class and we can miss a max of 35 to get an A.

Ravdeep Warar 2G

Dashed line would represent the atoms going away from you. Wedged shape line would represent the atoms going towards you. They are used in the structure to help differentiate the 3D model of the molecule as a Lewis Structure (i.e. Tetrahedral, Trigonal Planar) Additionally, they are used in organic...

Ravdeep Warar 2G

Chem 14B will be asynchronous, but Dr. Lavelle said that he is planning to give his exams during the lecture time and not discussion.

Ravdeep Warar 2G

Attending more workshops and doing the homework problems as we are learning about them has helped me.

Ravdeep Warar 2G

From what I've understood, the bonds are to be treated as one region of electron density because they will end up being considered the same one region.

Ravdeep Warar 2G

Since the final is 180 points, it will most likely have more questions than the past two midterms. I'm assuming that it will be multiple choice as well, just to be consistent with the previous two test types. Not sure about partial credit or anything else, but I'm sure Dr. Lavelle will update us soon!

Ravdeep Warar 2G

In addition to what was said above, I've heard that a lot of people take 14BL during the summer session just by itself, and it was very manageable. Just another option to consider!

Ravdeep Warar 2G

From what his emails have said, I don't think you should be too worried about it. He has said that everyone who wants his class will be able to get it.

Ravdeep Warar 2G

Can someone explain aluminum hydride to me? I know the answer is AlH3, but I'm confused as to how the +3 ionic charge for aluminum balances the +1 ionic charge for hydrogen. Al has a charge of +3 and H has a charge +1, so in order to create the compound, you are basically just swapping the charges ...

Ravdeep Warar 2G

I'm not sure either, Dr. Lavelle will most likely let us know if he is posting a lecture by the end of this week or beginning of next week, though.

Ravdeep Warar 2G

When following Hund's rule, do the electrons in each orbital all start with an upwards spin? Or does it not really matter as long as you know that pairs go in opposite directions and each orbital must be filled before pairing To my knowledge, it does not matter which spin direction you start with a...

Ravdeep Warar 2G

In addition to the previous comment, it is known that nitrogen heavily prefers triple bonds, so that is why that is better than a double bond.

Ravdeep Warar 2G

I've heard through graduated students that it was better to take Chem 14BL the quarter right after taking Chem 14B. It might be harder to manage taking both in the same quarter.

Ravdeep Warar 2G

We can most likely expect more questions with each worth a less amount of points due to the nature of the material being covered. 50 minutes with more questions without calculations is feasible.

Ravdeep Warar 2G

Yes, I believe Dr. Lavelle will be uploading a new lecture on CCLE on 11/11.

Ravdeep Warar 2G

Just to go over what the Kelter Method is... first you look at the name of the compound and find the number of electrons there should be. Then you multiply the number of electrons that would complete the octet rule (if we have CO3 -2) then it would be 4x8 =32 electrons. You then substract the initi...

Ravdeep Warar 2G

Just curious, has anyone else been using the Kelter Method in order to form Lewis structures? I was taught it in high school and have found it to be super helpful and effective in drawing the structures.

Ravdeep Warar 2G

I do not think we will need to memorize the radicals, but rather just be familiar with them and able to use them.

Ravdeep Warar 2G

Yes, previously in high school chemistry it was important to know that P, S, and Cl are exceptions. I'm not sure how many more there are, but like others have mentioned above, I do not think we will need to know all of them, just the commonly used ones.

Ravdeep Warar 2G

According to his latest email, Dr. Lavelle said that they will be released midday Thursday.

Ravdeep Warar 2G

The problems in outline 2 covered in section 1D will not be covered in this midterm, as stated by Dr. Lavelle.

Ravdeep Warar 2G

In addition to the previous comments, orbitals are not covered, as stated by Dr. Lavelle.

Ravdeep Warar 2G

I'm not sure if they're cumulative or not, I'd like to know the answer as well. It would make sense if they are cumulative.

Ravdeep Warar 2G

I also have a question about Chem 14BL. Is it better to take it during the summer quarter or during the school year? The summer quarter finishes the course in 6 weeks, so will it be manageable?

Ravdeep Warar 2G

Yes, I've heard that as soon as all the discussions have taken the midterm, the grades will be posted.

Ravdeep Warar 2G

I know Dr. Lavelle said that the last eight bullet points on Outline 2 are not included in our midterm, so I was wondering which practice problems for 1D do we need to stop at? 1D includes 1, 11, 13, 15, 17, 19, 21, 23, and 25. I think #11 is the last one that coincides with information for the midt...

Ravdeep Warar 2G

Jamie Wang 3G wrote:^^ Did he say graphing was fine in his office hours? I'm currently in a different country and its hard to find a scientific one here.

You should double check with your TA, but most of them have said both the graphing and scientific calculators will work!

Ravdeep Warar 2G

Dr. Lavelle's email was letting us know that he has emailed Sapling about the randomization issue and has asked them to fix it for us; we cannot fix it on our end.

Ravdeep Warar 2G

I personally haven't seen anywhere where he has said that he will post more for future lessons, but I hope he does! They are good to look at and go over before he covers the material in the lecture.

Ravdeep Warar 2G

The UA Peer learning sessions and workshops that are held every day give additional practice problems and can also give clarifications on coursework.
https://lavelle.chem.ucla.edu/wp-content/supporting-files/Chem14A/Chem14UA_PL_ALL.pdf

Ravdeep Warar 2G

Hi! I've had trouble figuring out significant figure rules throughout my time in chemistry. Rule #3 (Anything after a decimal is counted as a significant number, any trailing zeros as well) For the number 0.00450, are there 3 or 5 significant figures? It's numbers like these that I'm always confuse...

Ravdeep Warar 2G

Based on today's lecture #6, Dr. Lavelle worked a problem and said that you could leave your answers in nanometers or meters; both are acceptable. But, it is easier to just say nanometers for an answer if it is x10^-9.

Ravdeep Warar 2G

Same thing happened to me; I was getting 5.51 x 10^-45. I redid the calculations, this time by putting everything in at once, and it worked and I got 5.51*10^-7 m.

Ravdeep Warar 2G

Adding onto what everyone above said, the problems so far have not said anything with specific instructions for how many sig figs the answer should have, so it is best to pay attention to the numbers given in the problem.

Ravdeep Warar 2G

Could our cellphone or another device with a camera be used as an external webcam instead of buying or renting one?

Ravdeep Warar 2G

From Dr. Lavelle's module about limiting reactants, it was said that it is unlikely for a reaction to have two limiting reactants. I believe that all the problems we will be working with should only have one limiting reactant, if I'm not wrong.

Ravdeep Warar 2G

Yes, I used the same setup and did dimensional analysis with the grams of solution to find the grams of CaCl2. Afterward, I substracted from the amount given to find the grams of H20. I got the same results as you.

Ravdeep Warar 2G

I'm not sure if Dr. Lavelle has already covered this, but I was wondering if we will need to memorize and learn a set list of polyatomic ions or frequently used compounds? If not, will the formula always be given in the problem?

Ravdeep Warar 2G

I am looking to do some of the textbook fundamentals questions for extra practice, but I am having a hard time finding where they are in the e-text. Are they somewhere in the fundamentals section, or is there a certain page I should go to? In the e-text, they should be in the fundamentals section. ...

Ravdeep Warar 2G

We only turn in the Sapling homework for a grade; the textbook problems are just for extra practice and are there for our own benefit.

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