CHEMISTRY COMMUNITY

Claire_Kim_2F

What happens if it is anionic is it still aqua or would it be aquate?

Claire_Kim_2F

I noticed that oh2 is also considered aqua if it is in the coordination compound is that true?

Claire_Kim_2F

Is ha the base and a- the acid component of the equation?

Claire_Kim_2F

I know the work frequency equation is threshold frequency times the plancs constant. I was wondering if solving the threshold frequency equation is E=hv. Then you multiply it with the plancs constant in order to get the work function?

Claire_Kim_2F

I was wondering if work function= plancs constant* the threshold frequency? Also what happens if they do not give you the threshold frequency? Is there a way to calculate it?

Claire_Kim_2F

Is it aqua if it is directly connected to the coordination compound while it is called hydrate if it is not? Is there anymore examples of like differing names compared to the original atomic name?

Claire_Kim_2F

If iron is not directly connected to the coordination compound is it considered iron or is it called ferrate if the coordination compound is negative?

Claire_Kim_2F

I was wondering if the pka is higher than the ph then does that mean it is neutral according to the lecture #28 where Dr.Lavelle said it is negative because the pka is lower than the ph? Also what exactly does pka mean because I thought it was strength of acid but Dr.Lavelle said if it is more acidi...

Claire_Kim_2F

I was wondering why HF would stabilize the anion the most and be the strongest acid because I thought Hf would be the weakest because it is the hardest to break and would not disassociate as easily as the other ones listed in the chart?

Claire_Kim_2F

When I was doing the homework there seemed to be a pattern where the salts had a certain pattern where if it had a strong acid and a strong base it would be neutral. Then if it had a strong acid and a weak base it would be acidic and a strong base and weak acid would be basic. I was wondering if thi...

Claire_Kim_2F

I asked this question and it seems like he never called it a weak acid so it should be a strong acid.

Claire_Kim_2F

Good afternoon,
I was wondering if Dr.Lavelle considers HClO3 to be a strong or weak acid since I was reading the textbook and it said it could be considered either or.

Claire_Kim_2F

Thank you for the videos they were really helpful!

Claire_Kim_2F

I was wondering why oxalate is only a bidente because there is four oxygens in it that can be bound.

Claire_Kim_2F

I was wondering what was the 6 strong acids I think Dr.Lavelle mentioned it in lecture but I do not recall?

Claire_Kim_2F

Good afternoon,
I was wondering what the difference between the electron and molecular geometry was?

Claire_Kim_2F

https://lavelle.chem.ucla.edu/wp-conten ... pounds.pdf here is the link for anyone who needs it!

Claire_Kim_2F

This is such a cute question hopefully it is something chemistrywise.

Claire_Kim_2F

I usually try to go to the ua sessions throughout the week and most importantly the ones before the final/midterm because they do review and hopefully lavelle does an official review session for the final.

Claire_Kim_2F

I was wondering if the final exam will give partial credit on questions like midterm 1?

Claire_Kim_2F

Mine made pasta this year and I had a friendgiving with my friends and made a nice turkey together.

Claire_Kim_2F

Will they be proctoring through zoom again during that specific time so all the tas students will be in the zoom?

Claire_Kim_2F

I feel like it is going well and the multiple choice test are pretty simple with some harder questions.

Claire_Kim_2F

For the x-y-x question on the homework with two lone pairs on each side of the y why would that be a bent I thought the two lone pairs would cancel each other in force and it would make it a linear shape?

Claire_Kim_2F

For stronger intermolecular forces are you looking for the larger molecule because it has more electrons=stronger bonds while for intramolecular forces you would look for the smaller molecule so it can be pulled in closer?

Claire_Kim_2F

Is h20 to h2s considered a hydrogen bond because the S has a lone pair that can be attached to the h20 which is h-O bond?

Claire_Kim_2F

For hydrogen bonds does it matter what the other molecule is if it has lone pairs for a h-n,h-f, or h-o can bond to?

Claire_Kim_2F

Is LDF present in all intermolecular bonds it seems to be pretty common?

Claire_Kim_2F

What is the difference between a formal charge and a oxidation number?

Claire_Kim_2F

I was wondering what I have to print out for midterm #2

Claire_Kim_2F

I was wondering why the answer for the urea questions 8 bonds.

Claire_Kim_2F

I was wondering if Dipole Dipole and ldf were the same kind of force?

Claire_Kim_2F

I was wondering if there is a difference between induced dipoles vs permanent dipoles from todays lecture? I think induced is from elements that have similar electronegativities and or are the same while permanent is from two dramatically different electronegativities and was wondering if that was r...

Claire_Kim_2F

I was wondering if anyone had hannah chew's week 5 answers because I left early from her ua session.

Claire_Kim_2F

It has been mentioned in resonance structures there is hybrid structures for example N02 where the Os are in a sense both double bonded but are like 1.5 bonds and they have 5 valence electrons. I was wondering if this is its true form in nature or if it is never seen in nature but rather have either...

Claire_Kim_2F

I believe you do not like they will not ask what is the electronegativity of fluorine or something but you should know the general trend of how it gets more electronegative as you go to the right of the periodic table I just remember that fluorine is the most and just recall that.

Claire_Kim_2F

For my test anxiety I just read out the questions and try to stay calm and realize its rlly not the end of the world if I dont do extremely well on this test like 5 years from now I wont rlly care nor will doing bad on one test affect my future.

Claire_Kim_2F

Monoatomic gases are gases that are noble gases like halogen and other substances.

Claire_Kim_2F

I was also wondering what does the electron spin impact. Does it matter if its -1/2 or 1/2 except for the relative direction it is spinning?

Claire_Kim_2F

I was wondering how to determine if the electron is spinning +1/2 or -1/2?

Claire_Kim_2F

I do not think we need to know this but I do assume it is from experiments that they realized that.

Claire_Kim_2F

My all time favorite tv show is gossip girls because it kept me on my toes.

Claire_Kim_2F

You would probably go to ucla ccle quiz section and or myucla and go into your grade book to be able to see your midterm score.

Claire_Kim_2F

You are suppose to use E=hv with protons because they do not have mass thus the m is missing from the equation. While for E=1/2mv^2 is used for electrons or anything else that has mass and most of the time in the problem they either give you the velocity or the mass which is a huge giveaway to which...

Claire_Kim_2F

With this v = - R [ 1/n^2 -1/n^2] equation couldnt you use it to find the frequency and then convert it into E= frequency times plancs constant to figure out the exact energy?

Claire_Kim_2F

I was also confused on the objective about knowing how to calculate electron transitions for the H-atom spectrum using the En equation. Does this mean the En equation only works for hydrogen atoms? Am I able to use the rydberg equation for hydrogen atoms or do I have to use the En equation?

Claire_Kim_2F

Good afternoon, I was confused on using the Bohr frequency condition to explain the origin of the lines in the spectrum of an element. I thought the lines just depended on how many levels you dropped like if you dropped from n=5 to n=1 it would be 4 lines because it dropped 4 levels? Could someone c...

Claire_Kim_2F

Yes you are correct that for the Lyman series it has to drop down to the 1st level and for the Balmer it drops to the second electron level as the end result. Also if it is dropping that means energy is being emitted.

Claire_Kim_2F

For me I just use the equation and plug in for delta p and delta x with delta x usually being the diameter away from the atom and delta p equaling m and delta v usually. Then reading the problem and plugging into the equation. I wish I could put the equation here but I do not know how to attach imag...

Claire_Kim_2F

I think if energy is being released you need to make the value positive because it is releasing it and not consuming energy which is implied with the negative. I remember in a step up session my ua said the value is always positive because the energy is being released. Hope this was helpful!

Claire_Kim_2F

Good afternoon,
I was wondering if Dr.Lavelle,tas, or las were doing any official review sessions for the midterm because I remember last year Lavelle did.

Claire_Kim_2F

Good afternoon,
I was confused on question 6 from the homework because for the wavelength range in nanonometers do you plug in 6 and 1 into Rydberg's formula 1/λ = RZ^2(1/n1^2 - 1/n2^2) for the longest gap and then 6 and 5 in for the shortest gap?

Claire_Kim_2F

I was rewatching todays lecture and when Lavelle was discussing whether or not the car displayed wave like properties I got confused. How do you know if something displays wave like properties?

Claire_Kim_2F

I was wondering if the entire test will be multiple choice because I heard that but wanted to confirm on this forum?

Claire_Kim_2F

Your statement is correct and photons get their energy from their momentum rather from their mass because they still obey the equation E=pc.

Claire_Kim_2F

I personally prefer using paper notes because it is more useful and helps me out to actually write it out with a pen and paper.

Claire_Kim_2F

Discussions are not mandatory it seems for now because there is no work sheet to turn it but it is helpful and we will be taking the midterm/final during discussions

Claire_Kim_2F

Yah and Iphone would be considered an external webcam but he said it is not suggested and a bit more complicated.

Claire_Kim_2F

I cant find the respondus link on the ccle page could someone link it below?

Claire_Kim_2F

I also thought that E=hv is the bridge but it also implies that it can stay between levels which is definitely not true it can only be at like n=1 or n=2. So just being cautious of that implication and you should be good.

Claire_Kim_2F

Could not find it either because the syllabus says its online but someone in the community it says the 27th so I guess that day but if its during discussion wouldn't people be taking it on different days?

Claire_Kim_2F

I was wondering what is the difference between moles and molecules are. I thought of this during a step up session because the ua asked for it but I was a bit confused on the conceptual definition of it. I know you have to like multiply by avogardros number and I searched it up online but was still ...

Claire_Kim_2F

Oh I thought if you get it wrong over 5 times you get docked off because when I was about to give up it said I had 5 attempts.

Claire_Kim_2F

I do the sig figs at the end of the problem in order to keep it accurate.

Claire_Kim_2F

A formula unit is in a sense the chemical compound it seems with the least amount of elements so I thought of it as the simplest chemical compound and minimum number of elements in it. So it can also be called the empirical formula.

Claire_Kim_2F

Yah because it is measuring the electrons thus it needs the vacuum because the gas particles can affect the photoelectric effect by colliding with the electrons. This can mess up the experiment thus a vacuum is needed.

Claire_Kim_2F

How many sig figs would 0.003204 have? I assumed it would have four because the zeros before do not count but I just wanted to double check.

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