CHEMISTRY COMMUNITY

ATingin_3I

As discussed in class, a chelating ligand has more than one bond to the same transition metal cation. I also discussed in class that the best chelating binding structure/motif was: atom with lone pair --- spacer atom --- spacer atom --- atom with lone pair ***And the ligand must have sigma bonds to...

ATingin_3I

The acetic acid has a methyl group attached (CH3), which is an electron-donating compound. As such, the anionic form of the acetic acid is less stable since the CH3 does not delocalize the negative charge and instead adds to it. Meanwhile, the H atom attached to the formic acid is electron-withdraw...

ATingin_3I

what rule or reasoning does this fall under? did he cover electron-donating abilities in lecture?

ATingin_3I

For 6C)21, are we supposed to memorize acetic acid and trichloroacetic acid? or would we be given formulas?

ATingin_3I

one of the answers I saw online involved pKb. Could we use this or would we need other values?

ATingin_3I

Chem_Mod wrote:Hypobromite ion is negatively charged while morphine is neutral. HBrO is neutral while morphine would become positively charged after accepting a proton, which is less favorable. Thus hypobromite is the the stronger base

if something is a negative ion is it always a stronger base?

ATingin_3I

so what does pKa tell us? And what is its relation to pH?

ATingin_3I

I thought sig figs for pH were equal to the exponent?

ATingin_3I

Chem_Mod wrote:Kw was not discussed in 14A so you do not need to know it. It is the equilibrium constant for the autoionization of water into [OH-] and [H3O+]

so we can ignore that section in the textbook?

ATingin_3I

Kelsey Li 3B wrote:I agree with knowing about cisplatin especially because it was an example on the churro practice exam.

what is the churro practice exam?

ATingin_3I

ashwathinair wrote:You should know cisplatin has a different structure than the trans version of the molecule because of sigma and pi bonds and the lewis structures of each.

so what would transplatin be used for?

ATingin_3I

Oxidation numbers are rules that you need to memorize. The following link is from Khan Academy regarding identifying Oxidation numbers. It is pretty helpful. https://www.khanacademy.org/science/chemistry/chemical-reactions-stoichiome/types-of-chemical-reactions/a/oxidation-number I really do hope t...

ATingin_3I

briannam_3k wrote:Are we going to need to know fac and mer isomers as well as cis and trans?

what are fac and mer ligands?

ATingin_3I

I have a question about question 3F.13. The question asks which arrangement of molecules would produce the strongest intermolecular attractions. Since dichloromethane has an overall dipole and contains hydrogens, it is capable of forming hydrogen bonds, which would be the predominant intermolecular ...

ATingin_3I

It's probably easiest to just memorize a chart with all the bond angles stated, but for the test he said we just have to be able to say that a trigonal pyramidal shape has a smaller bond angle than a tetrahedral because of the lone pair having more repulsion than the bonded pair. but for this we do...

ATingin_3I

Destiny_Ryales_3J wrote:Wait so from which week to which week is this material from?

I would just look at the outlines and go from there to study

ATingin_3I

what is an example of an ion-ion interaction?

ATingin_3I

Valence bond theory goes as follows:
single bond = sigma bond
double bond= sigma and pi bond
triple bond = sigma and two pi bonds

ATingin_3I

If a radical is treated as 1 region of electron density, similar to a lone pair, does it also take up a larger region and create greater electron repulsion than a bonding-bonding pair?

ATingin_3I

KarineKim1L wrote:This means that the intermolecular bonds are stronger, and thus the liquid is "thicker". It will not flow as well.

what are the differences between intermolecular and intramolecular forces

ATingin_3I

JustinHorriat_3b wrote:Whats the difference between Dipole-Dipole forces and Dipole-Induced? Are there similarities also.

in dipole-induced the polarized side of a molecule creates an induced dipole with its partial charges

ATingin_3I

How do I draw resonance structures? I know that you can draw all the different structures and write arrows or draw them with dotted lines. Which one is better?

ATingin_3I

how many different types of covalent bonds are there?

ATingin_3I

Suraj Doshi 1L wrote:Angular momentum is denoted by l.

l=0 is the s-orbital
l=1 is the p-orbital
l=2 is the d-orbital
l=3 is the f-orbital

should we be familiar with anything past l=3?

ATingin_3I

how do we determine bond lengths/will we be asked to represent them?

ATingin_3I

what's the difference between dipoles and partial charges?

ATingin_3I

should we always do this when drawing lewis structures, or will the problem specify if we need to draw dipole moments?

ATingin_3I

What is the trend in effective nuclear charge across the periodic table?

ATingin_3I

What purpose does the radical serve? And how do we know when there is a radical present?

ATingin_3I

Will we need to know how to apply sigma vs. pi bonds for the midterm?

ATingin_3I

Is it true that the effective nuclear charge felt by an electron in the outermost shell of an atom is equal to the group # found on the periodic table? If so, why is this? And is this a reliable "trick" we can use?

ATingin_3I

ngarcia wrote:What are the exceptions in drawing Lewis structures?

i supposed the exceptions in lewis structures would be P, S, and Cl, or other elements where the octet rule isn't valid anymore

ATingin_3I

wait what part of the electron configuration chart is incorrect?

ATingin_3I

WYacob_1F wrote:In lecture, Lavelle said "charged delocalization tends to be more stable." Could someone please explain this?

delocalization of electrons means that an electron is freely moving around multiple overlapping orbitals, so the bond is spread out over more atoms, which makes it more stable.

ATingin_3I

Are P, S, and Cl the only elements that can accommodate more than 8 valence electrons, or are there more exceptions?

ATingin_3I

How many maximum valence electrons can xenon have? I thought it followed the octet rule, but I'm not sure anymore.

ATingin_3I

Why is it that each orbital can only hold 2 electrons max?

ATingin_3I

How do you figure out the subscript for the different orbitals? For example, how do we find the difference between P sub x and p sub y?

ATingin_3I

Particle in a box is a concept that is a way of looking at the concept of the quantized energy levels of electrons. It can be used with any wave model, being related to that of an acoustic guitar string. However, Lavelle stated you didn't need to focus on this concept. Wait what exactly is particle...

ATingin_3I

Can someone clarify why the Rydberg equation is always negative? Because you're "losing" energy because it's being transferred somewhere else? The Rydberg equation is negative because it is comparing the energy difference between the two levels the electrons transitioned between. When an ...

ATingin_3I

During the lecture on Friday, Dr. Lavelle mentioned that puter electrons don't experience the full nuclear charge. Is this due to electron shielding?

ATingin_3I

why is it that when we decrease the wavelength, the energy and frequency increases?

ATingin_3I

I think it's just that when we increase the intensity of light then we increase the number of photons and vice versa. However, to determine if an electron is ejected, then we look at frequency instead.

ATingin_3I

For L 35, what does the unit t in 2.50 t of NaBr mean?

ATingin_3I

When we are doing problems like these, is the mass of an electron always in terms of kg? Or do we have to convert them to g?

ATingin_3I

Also speaking of frequency, is frequency always measured in terms of Hz?

ATingin_3I

Tanmay Singhal 3F wrote:Is there any difference between calculating theoretical yield with grams versus theoretical yield with moles?

no, they should be the same. if they aren't then you need to check the conversion factor you are using between grams and moles.

ATingin_3I

For questions like G7 can we also assume that after finding the grams of the given compound in the aqueous solution, the leftover is just water?

ATingin_3I

For some reason in this problem I am always .01 off when I round. Is anybody else having this problem and if so have any advice? I am doing the same process as mentioned above (setting up ratios and solving for x)

ATingin_3I

Also, what is the significance of mmol? Where does this unit affect our calculations?

ATingin_3I

I agree with the other user that the amounts should be leaning towards a value usch as 0.5 or 0.33. In addition, I would like to add that each step of the way to use the correct sig figs because this personally has helped me to find values that I can see where to round to more so. In many situation...

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