CHEMISTRY COMMUNITY

Kylie McCauley 1D

Hey, I don't know if you've heard of this but I use the pomodoro method to keep me focused when im working/studying. you can google it but it involves setting a timer for 25 minutes and completely focusing during that time, and then when thats over setting a timer for 5 minutes to take a break. Then...

Kylie McCauley 1D

Hi

is there any way to review our final exam from 14A?

thanks

Kylie McCauley 1D

I believe that you are supposed to do 5 posts per week, and the deadline of each week is the Sunday right before the Monday of the next work week. I've been doing my posts this way and receiving full credit. However, the TAs/Lavelle only seem to check how many chemistry community posts you made a fe...

Kylie McCauley 1D

hey,

these two phrases generally mean the same thing, it's just that reactions don't really "shift".

Kylie McCauley 1D

Hi,

I had to miss my discussion section for the first week and emailed another ta to ask if I could attend theirs and they never answered, can I just attend another TA's section if I miss mine?

Kylie McCauley 1D

is pKa kinda the same as pH, and pKb the same thing as pOH?

Kylie McCauley 1D

Hi, In oxoacids, it appears that electronegativity trumps atomic radius, is this correct? for example, The acids : HClO, HBrO, and HIO are strongest to weakest in that order. If they were normal acids without the oxygen, their relative strength would be in the opposite order. And overall, are oxoaci...

Kylie McCauley 1D

Hi,

What grade in this class constitutes an A versus an A-?

Kylie McCauley 1D

Hi,

Do we have to memorize the amphoteric oxides for the final? What general things should we memorize for it?

Kylie McCauley 1D

Hi,

Can someone please explain why MgS is the right answer?

Which of the following compounds below has bonds with the most covalent character?
A. Li2O
B. MgS
C.CaO
D. MgO
E. CaS

Kylie McCauley 1D

hi,

where are Dr. Lavelle's slides from the Wednesday 5 pm review that went over previous test questions?

Kylie McCauley 1D

Hi,
what is the connection between resonance and acid strength?

Kylie McCauley 1D

can you go to another TA's office hours to review your midterm?

Kylie McCauley 1D

hi,

does anyone know when the last day of lecture will be for 14A?

Kylie McCauley 1D

hi,

can someone please walk me through the steps of naming this coordination compound?

Kylie McCauley 1D

Hi,

does anyone have a good chart they like to use to name coordination compounds?

Kylie McCauley 1D

hi,

did you update your computer? if you have a Mac CCLE isn't compatible with the new update and it could be that. hope this helps

Kylie McCauley 1D

Hi, I know that this isn't in the scope of our class, but I was wondering if anyone knows why gravity doesn't have an effect on the structure of molecules in vsepr modeling? Is it because the atoms that make up molecules have so little mass the pull of gravity doesn't matter, or is there is a gravit...

Kylie McCauley 1D

hi,

to determine the hybridization of atoms on a molecule, do you just count the regions of electron density? So, if there are 5 regions of electron density, it would be sp3d ?

Kylie McCauley 1D

Methane (CH4) has four regions of electron density and ammonia (CH3) does as well, except that it has one lone pair and 3 bonds. The VSEPR structure of methane is tetrahedral, while ammonia is trigonal pyramidal. Why is it that ammonia (or any other atom with 4 regions of electron density) is not te...

Kylie McCauley 1D

hi,

does anyone know how the structure of 14B changes when compared to 14A? Are there different homework assignments?

Kylie McCauley 1D

I go swimming (when pools are open) and go on walks or runs sometimes

Kylie McCauley 1D

Hi,

Are lewis structures that don't have the most ideal formal charges on each of the atoms considered incorrect?

Kylie McCauley 1D

hi,

is the final for this class held during class time, discussion section, or something else entirely?

Kylie McCauley 1D

Hi,

for chem 14A do we have to know about variable valence rules for metallic elements?

Kylie McCauley 1D

Hi, I know that chromium and copper are two atoms that have exceptions to the normal method of electron configuration because the 3d orbitals fill before the 4s, but does that apply to the rest of the atoms in the d-block that are in the same kind of position? for example, does this apply to Molybde...

Kylie McCauley 1D

Hi,
Is discussion attendance counted and put towards are final grade in this class?

Kylie McCauley 1D

Hi,

What should we know about the radial distribution function for the purposes of this class? I'm currently reading about it in section 1D.4 : The shapes of orbitals.

Kylie McCauley 1D

Hi,

no not at all check out the instagram @pump.ucla

Kylie McCauley 1D

Hi,

Will we have to memorize the formula for calculating bond lengths/know how to calculate bond lengths for Dr. Lavelle's class?

Kylie McCauley 1D

hi,

What are oxidation numbers, how do we calculate them, and will we have to know how to calculate/apply them to the midterm?

Kylie McCauley 1D

Hi, Someone correct me if I'm wrong, but lewis structures generally represent only covalently bonded molecules, because the line that you draw connecting two atoms in these structures represents a pair of shared electrons, which is not something that happens with ionic compounds. So calculating betw...

Kylie McCauley 1D

Hi,

Also, the most electronegative atoms (like Cl, F, O) should have the negative formal charge in a molecule over an atom like C or B.

Kylie McCauley 1D

Hi, can someone help me with this homework question please? Urea is an organic compound widely used as a fertilizer. Its solubility in water allows it to be made into aqueous fertilizer solutions and applied to crops in a spray. What is the maximum theoretical number of water molecules that one urea...

Kylie McCauley 1D

hi,

When calculating formal charge for structures that overall have a charge, should the formal charge of each of the atoms add up to the total charge of the molecule? Also, should certain atoms have certain charges, like should chlorine always be negative?

Kylie McCauley 1D

I really am not loving the online school format, but I do like the flexibility that comes with it. I do feel like there's a lot more on you to remember when assignments are do, which is not ideal. Can't wait to have in person classes again!

Kylie McCauley 1D

Hi,

How do you know if an atom can have a full valence shell with more or less than 8 electrons?

Kylie McCauley 1D

I wish! Dr. Lavelle said that there will be no midterm review because of the online format. It's really unhelpful to recognizing what you did wrong and I've had other classes with CCLE quizzes that were able to review the quiz questions, so hopefully he changes his mind about it!

Kylie McCauley 1D

The central atom, most of the time, has to have at least 8 valence electrons, so the amount of bonds it forms depends on the other atoms in the compound. Atoms like phosphorous can be a central atom with an expanded octet of 10 atoms because it uses the d orbital. But it depends on the amount of oth...

Kylie McCauley 1D

Do we have to have the polyatomic ions memorized for the exam? will we have to be able to recognize them by name and write their formula?

Kylie McCauley 1D

hi,

How do I do this problem?

The molar mass of the metal hydroxide M(OH)2 is 74.10 g/mol. What is the molar mass of the sulfide of this metal?

more specifically, what does "sulfide of this metal" mean?

Kylie McCauley 1D

https://forms.gle/SYX2oyUfTHojpvJZ7

Kylie McCauley 1D

Hi,

I thought midterm 1 went up to question 19 in weeks 2-4 of the sapling homework, but the questions seem to cover a lot about orbitals and writing electron configurations, which I believe we were told we wouldn't have to know for the midterm. Can anyone clarify this?

Kylie McCauley 1D

hi, I cant figure out either part of this sapling question: When a metal was exposed to photons at a frequency of 1.15 s^-1, electrons were emitted with a maximum kinetic energy of 3.80 X 10^-19 J. Calculate the work function of this metal (answer in J/photon). What is the maximum number of electron...

Kylie McCauley 1D

Hey guys I’m in this really cool club called PUMP where you get paired with an order UCLA pre med mentor who can help you figure out your classes and give you advice or answer any questions. There’s really no commitment, it’s free, and you can be involved as little or as much as you want. We’re goin...

Kylie McCauley 1D

My computer is currently being repaired and I don't know if I'll have it back in time for the midterm, can I use my iPad to take the exam with respondus?

Kylie McCauley 1D

what is the exam format for midterm 1? do we know roughly how many questions we have to answer within 50 minutes?

Kylie McCauley 1D

Hi, what kind of calculator are we allowed to have for the exam?

Kylie McCauley 1D

found it, thank you!!

Kylie McCauley 1D

What exactly was the unexpected outcome of the wave-particle experiment discussed in week 2 lecture 1 lecture, and why was it significant?

Kylie McCauley 1D

What is the password for 14A students to get onto the chemistry website? its never asked me for a password before.

Kylie McCauley 1D

I missed discussion section last week and I know we went over respondus and how to set it up, what exactly should I do and should I do to set it up and what do I need?

Kylie McCauley 1D

I'm still a bit confused. How do I attend step up sessions, and who teaches them? What happens during a step up session, do you review the weeks topics or do a worksheet?

Kylie McCauley 1D

Hi,

My computer comes with a webcam, does that mean I have to buy another one for this class?

Kylie McCauley 1D

Is there a groupme for this class, or for discussion section 1L?

Kylie McCauley 1D

Consider the nucleophilic addition reaction of 2‑butanone with excess propyl magnesiumbromide, made in situ by reacting 1‑bromopropane with metallic magnesium, to make 3‑methyl‑3‑hexanol. Image A reaction was performed in which 0.55 mL of 2‑butanone was reacted with an excess of propyl magnesiumbrom...

Kylie McCauley 1D

Consider the nucleophilic addition reaction of 2‑butanone with excess propyl magnesiumbromide, made in situ by reacting 1‑bromopropane with metallic magnesium, to make 3‑methyl‑3‑hexanol. Image A reaction was performed in which 0.55 mL of 2‑butanone was reacted with an excess of propyl magnesiumbrom...

Kylie McCauley 1D

What's the difference between homework problems and step up sessions?

Kylie McCauley 1D

I have a hard copy of the chemistry textbook, but I don't want to purchase a Sapling subscription if possible because I don't need the textbook. Is there a way around this?

Kylie McCauley 1D

if you're currently enrolled in a discussion and want to switch to another one, but you would be out on the waitlist for it, can you still switch?

Search found 60 matches