CHEMISTRY COMMUNITY

Chanel D_4E

It probably depends on your TA. I have heard that some TA's just look to see if you have done 50 posts by the end of week 10.

Chanel D_4E

You add -ate to a negatively charged molecule/anions in which you would use their Latin name (ex. Ferrate, Cuprate,etc). You don't need to change anything for a positively charged molecule.

Chanel D_4E

The most stable Lewis Structures are the ones that have a formal charge of 0

Chanel D_4E

Nitrito will either be written as ONO or NO2 with the O atom underlined. Nitro will be written as NO2 with N underlined.

Chanel D_4E

A represents the central atom, X represents the number of atoms bonded to the central atom and E represents the number of lone pairs on the central atom.

Chanel D_4E

Bent and angular are interchangeable. Whichever term you prefer, you may use.

Chanel D_4E

In the syllabus it states that "Only at the end of the class when the class average score (out of 500 points) is known are final grades assigned. This class does not use a curve."

Chanel D_4E

Does anyone know how many points is equivalent to a C, C+, B-, B, B+, and so on?

Chanel D_4E

Yes, you need at 250 in order to pass with a C-.

Chanel D_4E

I agree! Organic Chemistry Tutor is very helpful.

Chanel D_4E

Lavelle doesn't bruincast his lectures. Your best bet is rewatching his audio-visual topics on the class website. Or you may read the textbook if you don't understand certain topics.

Chanel D_4E

Our last lecture will be on Wednesday and Friday will most likely be review.

Chanel D_4E

Yes, we turn in homework for week 9 and 10 if you didn't have discussion last week. Or if you had discussion and did not turn in week 9 homework then, you can do so this week.

Chanel D_4E

Single bond = 1 sigma bond
Double Bond = 1 sigma bond, 1 pi bond
Triple Bond = 1 sigma bond, 2 pi bonds

Chanel D_4E

I'm assuming we will get back test 2 during week 10 discussion and the final is cumulative! I have a feeling there will be more emphasis on the new material that wasn't covered in the midterm.

Chanel D_4E

You could also drop the picture into the text box itself. It won't show up at first but when you press preview you could see if your picture is there.

Chanel D_4E

There should be a code that came with the book you purchased. However, if you can't access it and didn't exchange the Sapling access code for a SaplingPlus access code a few weeks ago, I would recommend taking pictures of the physical copy of the book or scan it but that's a bit of work :(

Chanel D_4E

It would be easier to just memorize them. The seesaw shape would be <90 and <120 degrees

Chanel D_4E

Electron affinity increases as you goes up a period and across a period (from left to right).

Chanel D_4E

Does anyone know how many points a B- would be per se if 250/500 is a C-?

Chanel D_4E

I think you only need 250/500 to pass the class with a C-

Chanel D_4E

Yea, exactly!
Single bond = 1 sigma bond
Double Bond = 1 sigma bond, 1 pi bond
Triple Bond = 1 sigma bond, 2 pi bonds

Chanel D_4E

I believe that it would be good to memorize the bond angles and molecular shapes for the test.

Chanel D_4E

Electronegativity increases up a period and across a period from left to right!

Chanel D_4E

I believe that test 2 will cover everything after the midterm

Chanel D_4E

I am also not sure which is best to take together. However, I have met people that say they've taken chem14b and chem 14bl together or they have just taken chem14bl by itself.

Chanel D_4E

I don't believe you need to memorize the electronegativity numbers just the electronegativity trend which increases across and up a period.

Chanel D_4E

I believe you could still turn in homework from the chemicals bonds section for week 7

Chanel D_4E

From what I can remember I think everything up until the end of last week including dipole moments will be on the midterm. Feel free to correct me because I might have heard wrong :)

Chanel D_4E

Sadly, no :((( I believe it would be very beneficial if he did.

Chanel D_4E

Yes, thankfully we don't have two midterms! :) Just test 2 and a final.

Chanel D_4E

I also saw the email and am wondering about this too. However, I can still access the ebook but I haven't switched to sapling plus.

Chanel D_4E

I think we don't need to worry about it for the first midterm!

Chanel D_4E

I believe we do have lecture on Nov. 27 and discussion section as well if you have one on Wednesday.

Chanel D_4E

You may also go to the test bank and see what Lavelle's previous tests consisted of so you have a general idea of what our's may possibly look like :)

Chanel D_4E

Did you buy the bundle? I believe if you bought the chemistry bundle in the beginning of the quarter I believe you would be able to access the course. If not, I assume you would have to pay $64 :(

Chanel D_4E

Linear momentum is expressed as p=mass*velocity. Thus, the SI units should be kg*m/s

Chanel D_4E

There should be some practice assignments on Sapling Learning, other than that I am not sure of other resources.

Chanel D_4E

Chanel D_4E

I believe you meant percent yield.
Percent Yield = (Actual Yield / Theoretical Yield) * 100%

Chanel D_4E

a) Three orbitals
b) Five orbitals
c) One orbital
d) Seven orbitals

Try to make note of the number of orbitals in each type of subshell...
s: 1 orbital
p: 3 orbitals
d: 5 orbitals
f: 7 orbitals

Chanel D_4E

Yes! The homework for week 4 still deals with "The Quantum World" section so we would just submit a different set of 5 problems this week.

Chanel D_4E

I believe there are two ways you could do this. First, try to drop/add the image into the text box directly and then hit preview in order to see if the image appears in your post. Or you could look below the submit button, and there should be two tabs labeled "Options" and "Attachment...

Chanel D_4E

I believe you could go to TA or Professor Office hours for any questions, comments, or concerns you may have leading up to the midterm. According to the syllabus, there should be many exam review sessions, workshops, peer learning sessions, and step-up sessions every week.

Chanel D_4E

I agree with the previous person. Maybe in the future we will need to know how to write the molecular formula from it's name and vice versa but I don't think it is something to worry about as of right now.

Chanel D_4E

I believe that they are due Sunday before 11:59pm. If anything try to get your 5 posts in before Sunday so you don't have to worry about it! Hope this helps :)

Chanel D_4E

I believe that we'll have class the Wednesday before Thanksgiving because I actually added my classes I think from MyUCLA to my calendar.

Chanel D_4E

Q: What two elements do sheep belt when happy?
A: BaH!!

Chanel D_4E

I think for the online version you would need to find the table of contents on the left hand side (underneath the home button) and find the sections that he assigned. For instance look for Focus 1, then you would read Topic 1A Investigating Atoms and all the way at the bottom you would find the home...

Chanel D_4E

I think that the threshold energy has to always be greater than or equal to the rest energy in order for the electrons to be emitted.

Chanel D_4E

I would suggest to view the modules again, look over lecture notes, do more practice problems on the concepts that you don't really understand (although that sounds a bit tedious it could turn out to be beneficial), and maybe look for outside sources if needed. For instance, you could watch videos o...

Chanel D_4E

oxygen+sodium+sodium = O Na Na whats my name...

Chanel D_4E

I'm not sure if you will be penalized. However, I think it might be good to write the units throughout the whole problem so that your TA will know how you went from say grams to atoms or whatever the problem asks you to do.

Chanel D_4E

I think that if you keep in mind the sig fig rules and how to properly decipher how many sig figs are needed in the final answer, you should be able to come up with the correct number. You could also look at the solutions manual so that you know exactly how much you need to round your answer in the ...

Chanel D_4E

I believe so. You would write H20 not OH2 because the element with the positive oxidation number comes first or before the element with the negative oxidation number.

Chanel D_4E

You are trying to find the molar mass of M so essentially what does M=? 1) The molar mass of (OH)2 is 34.02 g/mol 2)Molar mass of metal (M) = 74.10 g/mol - 34.02 g/mol = 40.08 g*mol^-1 When you look at the periodic table the molar mass matches the element Ca 3) Now find the molar mass of Calcium Sul...

Chanel D_4E

You should have gotten an email with a link to access sapling learning. From there you need to create a new user ID if you don't have one already and then once you log in you will be able to see the chem course. To access the book look all the way to the right hand side and it should say eTextbook u...

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