CHEMISTRY COMMUNITY

ArielKim3C

I believe we have to know the ions in the following link, since one of the UAs posted this and suggested we know them. https://lavelle.chem.ucla.edu/wp-conten ... pounds.pdf You can access the post by searching up "Coordinate Compound Notes" and it should be like the first post to pop up. ...

ArielKim3C

I believe that this is our last week of chemistry community questions since in the syllabus, chemistry community is listed as 3 points per week, for a total of 30 points. Therefore we only have to do it for a total of 10 weeks, with this week being our last and final week.

ArielKim3C

MadisonB Lec 1 Dis 1K wrote:If you attended any of the review sessions for the midterm, we were given practice problems (as well as the "garlic bread" packet). Also, you might have gotten back previous tests.

I believe there was another set of practice problems posted by UA Ronald Yang too that could be helpful.

ArielKim3C

Here are the notes!

Also Lavelle just announced the review session dates and times which you should be able to find on the class website. Hope this helps!

ArielKim3C

Quoting another student from a different post,

"My TA said these would be the topics:
-VSEPR, Molecular Geometry, Lewis Structures
-Intermolecular Forces
-Hybridization
-Polarizability"

Hope this helps!

ArielKim3C

I found this "cheat sheet" that was helpful for me because it lists the different types and how to identify them (page 2). Hope it helps you too!

https://www.masterorganicchemistry.com/wp-content/uploads/2010/10/MOC_Boiling_Point_Handout.pdf

ArielKim3C

No, the class isn't based on a curve. From the syllabus: " 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."

ArielKim3C

Someone else posted this on here and I thought it was handy so here you go!

download/file.php?id=4429

ArielKim3C

On the website it says "Test 3 covers: End of Bonding from 3.12 (6 Ed.) and from 2D (7 Ed.); and all of Molecular Shape and Structure"

ArielKim3C

I think we are supposed to say the VSEPR model per atom. For example C2H4, both labels would be trigonal planar. If it was C2H3O-, then we would label the C's as C1 and C2. C1 would be trigonal planar while C2 would be tetrahedral. I agree. During my discussion section my TA did an example for a mo...

ArielKim3C

thank you so much this is actually so helpful!!

ArielKim3C

705160853 wrote:When would it be official? aka when would we actually know if the class is cancelled?

I believe Lavelle will probably announce it during lecture on Friday or possibly Monday.

ArielKim3C

What kind of fish is made out of two sodium atoms?
2 Na

ArielKim3C

Why do chemists enjoy working with ammonia?
Because it's pretty basic stuff!

ArielKim3C

MMoreno3K wrote:Does anyone know when our next test is? I remember someone telling me it would be this upcoming Friday but that seems so soon. If someone knows please let me know, thanks in advance.

The next test will be after Thanksgiving, so starting the week of November 26th!

ArielKim3C

Here's the work too if you wanted to see what numbers to use and such!

ArielKim3C

I agree. An answer key to the tests would be beneficial for understanding questions that we got wrong and further for studying!!

ArielKim3C

I would be down!! My name is Ariel Kim

ArielKim3C

I find completing practice problems extremely helpful! Try to do all the hw problems and other problems in the textbook. Also, reviewing the tests and going over the problems again and your mistakes. There are also other practice problems that some of the UAs have posted!! I believe there will be s...

ArielKim3C

Constants like the examples you provided do not need to be memorized for they are given on an equation sheet with the test, however my TA recommended that we do memorize them just so that we don't have to constantly be flipping back to the equation sheet during the test.

ArielKim3C

What is the show cesium and iodine love watching together?
CsI

ArielKim3C

He started the next unit and discussed chemical bonds, including covalent and ionic bonds. He gave examples on how to draw Lewis structures for both types of bonds, as well as for polyatomic species

ArielKim3C

Thank you so much for the extra practice!!!!

ArielKim3C

I believe that hydrogen bonds are weaker than ionic and covalent bonds because a hydrogen bond occurs when a slightly negative molecule and a slightly positive molecule "attract" each other. Therefore, it is easier for the bond to break. On the other hand, in a covalent bond, electrons are...

ArielKim3C

Hz and s^(-1) are used interchangeably but it may be easier to use s^(-1) during calculations just to ensure that all the units cancel out by the end. The final answer would most likely then be stated using Hz.

ArielKim3C

Professor Lavelle told us during lecture to not worry about black bodies for now so I believe you can just not worry about it for now.

ArielKim3C

Put in other words, the intensity of a wave is also measured by its amplitude.

ArielKim3C

I believe that the modules don't have a due date and are just extra resources for us that we can use to study for the test.

ArielKim3C

Thanks so much for the advice!! It's so reassuring :,)

ArielKim3C

I believe that it is implying that there are two moles of iron for every one mole of the compound, instead of two moles equalling one mole of the compound.

CHEMISTRY COMMUNITY

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Re: Which ions do we have to memorize?

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