CHEMISTRY COMMUNITY

Renny_kim_2G

Helium makes my laugh sound like he he he

Renny_kim_2G

Does this mean polydentate ligands and chelating ligands are the same thing?

Renny_kim_2G

Thank you Dr. Lavelle. I really enjoyed this class!

Renny_kim_2G

I just clicked on the link that I got through an email. It worked fine for me. Maybe this can help?

Renny_kim_2G

As Dr. Lavelle said in his final review, don't use your energy to stress. We can use that time and energy to review another concept perhaps. Get some rest and make sure you are on a consistent sleeping pattern.

Renny_kim_2G

It is certainly good to memorize using the methods listed above, but I also recommend that you take into consideration each molecule your come across. I got into a habit of noting which elements seem present in certain situations, and this helps me understand or assume that certain elements are meta...

Renny_kim_2G

I would recommend taking them at separate times. A current junior at UCLA told me that most people just take the 14 series over the course of three quarters.

Renny_kim_2G

For me, I usually make sure that I fully understand all the lectures so that I have a strong foundation. Then, a week or two before whatever exam we have, I usually would go through textbook problems and work out every single one listed and review sapling.

Renny_kim_2G

Does anyone know the minimum points we can lose to maintain an A or A-? Or is he curving the grades later? I've mostly heard that he uses a straight grading scale with no curves (490/500=A+, 465/500=A and so on) but I'm not entirely sure on this. The only thing I know for sure is that he doesn't do...

Renny_kim_2G

You have to contact your TA to set up a separate time. Even then, you will not be able to visually see what you got wrong if I am not mistaken.

Renny_kim_2G

You can just click on CCLE, go to the chem page, and scroll down to the bottom left where it says grades to get an overview of your midterm grades and more.

Renny_kim_2G

Does anyone know the minimum points we can lose to maintain an A or A-? Or is he curving the grades later?

Renny_kim_2G

By now, you can check your grades on CCLE if you have 35 points to make sure that you have been on track.

Renny_kim_2G

Does anyone know if we get partial credits for questions on the finals?

Renny_kim_2G

I thought we didn't have a curve since people in groupme said like we can only miss a total of 17 points to maintain an A in the quarter.

Renny_kim_2G

If I remember correctly, it took about a week on the first midterm, so hopefully ASAP.

Renny_kim_2G

There are a lot of factors aside from the number of bonds that determine bond length, so it is hard to say or apply that for every case.

Renny_kim_2G

A little late, but there are 16.

Renny_kim_2G

Cl would be. You can either look at the trends on the table, or just from the fact that N, O, F are one of the most electronegative elements, you can probably assume O has the higher electronegativity.

Renny_kim_2G

A little late, but it was the same haha I am sorry I could not be helpful before.

Renny_kim_2G

I understand that having a formal charge of 0 is the best for any molecule, but would this be attainable by every molecule? How do you know if a formal charge for a molecule is the lowest it can get? Adding on to this, is having the central atom with a formal charge ideal if there is an overall cha...

Renny_kim_2G

Carbon should have a charge of -2 because the equation says 4 - (4/2 + 4), which equals -2.

Renny_kim_2G

If you are unsure or questioning something, you should probably learn it just to be safe. Better to know more than less. Good luck!

Renny_kim_2G

Megan wrote a very clear explanation of why the oxidation number for Cl is +7, which was because oxygen is -2. However, there are exceptions to oxygen's oxidation number and I just wanted to point that out!

Renny_kim_2G

You should aim for three main things:

1. make sure to have as many 0's as possible
2. aim for low magnitudes with non-zeros
3. have negative charges on most electronegative atoms

Renny_kim_2G

In short, electron affinity is the energy released as electrons are added to a neutral atom, whereas electronegativity is the ability to attract electrons. Therefore, these two are different.

Renny_kim_2G

If you are referring to ionic characters as in the partial positive and negative charges due to differences in electronegativities, then that probably means that the two are interchangeable in some ways.

Renny_kim_2G

The more pairs of electrons and protons you have, the more attraction there is. Therefore, as you move right, these pairs increase and the radius gets smaller.

Renny_kim_2G

If you are concerned, might as well learn it just to be safe. Although the last midterm did have calculation problems, concept questions definitely took up a good part of the exam, so it may be a good idea to own it in your own words.

Renny_kim_2G

A lot of people answered the reason, but I just want to make a side note that knowing the electronegativity trend might be really helpful. It just makes our lives easier. While you are at it, might as well check out the trend for atomic radius as well.

Renny_kim_2G

I would recommend taking them at separate times. Since you are already in 14A, might as well just do 14B next quarter and save the other for another time. However, if you think you can take them simultaneously, go for it! After all, you know yourself best.

Renny_kim_2G

They will post it once everyone is done? is what I am guessing. I hope it went well for you.

Renny_kim_2G

You can use wavelength = h/mv, where m is mass of an electron and v is velocity.

Renny_kim_2G

You should just aim to do the first 19 questions as Dr. Lavelle told us in the emails. Hopefully the exam was not too bad for you!

Renny_kim_2G

We do not have to memorize them. Still would be good to be able to recognize them.

Renny_kim_2G

You can use the E=hc/lambda equation to find the maximum wavelength. Since E is given in joules and you know h and c, just plug in the numbers to find wavelength in m. Then you convert that to angstrom via the conversion 1 A =1 x 10^-10m

Renny_kim_2G

The wavelength depends mainly on which metal surface you are talking about. This means that you cannot take the same approach for every problem. It varies each time.

Renny_kim_2G

It seems like you have the numbers that you can plug in to get the work function. Once you find that, divide the total energy by the work function to get the answer.

Renny_kim_2G

You can just divide the work function by the Avogadro's number for energy needed for just one sodium atom. You should also change the units to J, not kJ.

Renny_kim_2G

You should probably plug in the true values into your calculator. Keep in mind, however, the sig figs at the start. This way, you can simply round at the end.

Renny_kim_2G

There definitely are several ways you can go about in balancing equations. I'd say stick to what you have been doing. There is probably a mental map that you visualize before solving the problem, and it is probably the most efficient method for you.

Renny_kim_2G

It would be a good idea to know the fundamentals. Even though the formulas are given, it is important that we utilize them and apply them to certain concepts. Nonetheless, it does not hurt to know them.

Renny_kim_2G

It is probably a good idea to complete the sapling homework before your midterms. However, it may be better to focus on sticking with your own study tips so that you can own the information before your midterms. This can mean testing yourself on the content or creating study sets to review. Good luck!

Renny_kim_2G

Kelvin does not use degrees. You can just leave it as __ Kelvin.

Renny_kim_2G

For things like sulfuric acid, I believe that it is memorization. However, things like disulfur dichloride, there are a set of rules to know in order to figure out the formula. I hope this helps.

Renny_kim_2G

You can simply click and the quotation button on the person's post that you want to reply to.

Renny_kim_2G

We need to reply 5 times a week, which adds up to 50 points at the end of the quarter for a total of 50 points.

Renny_kim_2G

It would be positive two because when writing something into scientific notation, you are essentially undoing what you did in order to reach the correct scientific notation. You can always use the calculator to verify your answer, but you can also use this as a rule of thumb: if you go from a bigger...

Renny_kim_2G

Significant figures are confusing and have several rules that one must adhere to. While the main purpose is to maintain order and to be as precise as possible. On the differences of adding/subtracting and multiplying/dividing, these are just rules that we must accept. Although it is good to always q...

Renny_kim_2G

Trailing zeros with no decimal point are not significant numbers. That's why 950000 only has two significant figures. However, if there was a decimal, you would include the zeros because they are now significant. In the case of 80060, there are four significant numbers, which are "8006". T...

Renny_kim_2G

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