CHEMISTRY COMMUNITY

Andy Hernandez

Yes, temp is the only thing that changes k

Andy Hernandez

Concentration is in moles/liters. We can't have a negative amount of moles or a negative volume so it's positive

Andy Hernandez

I think either bars or atm would work since they are similar. Most likely tho, Lavelle would tell us regarding the specific problem.

Andy Hernandez

It is just the inverse of K or 1/K

Andy Hernandez

the unit of pressure should be in atm

Andy Hernandez

Tetrahedral is AX4. Square planar is AX4E2

Andy Hernandez

The pH formula is -log[H+]

Andy Hernandez

Yes hard water is alkaline and soft water is acidic.

Andy Hernandez

Im just gonna binge watch netflix and yt but also have to read a book for my cluster class :(

Andy Hernandez

You can determine if a species is acidic or basic bc if it donates a proton, then it’s acidic, if it accepts, then it’s basic.

Andy Hernandez

Polydentate ligands can form multiple bonds and create more than one coordinate covalent bond with the central metal atom while monodentate ligands bond at only one site

Andy Hernandez

Goes in alphabetical order, excluding prefix.

Andy Hernandez

I doubt we can. We haven't been allowed to use notes or cheat sheets of any kind besides the equation sheet and periodic table. Maybe Lavelle will say we can later but rn i haven't heard anything abt being able to use a chart

Andy Hernandez

IreneGi2I wrote:I think it would be nice to practice and memorize some ligands on the ligand chart on textbook as well.

How do we find this chart?

Andy Hernandez

Use name of the compound, ammine, first and disregard the prefixes when naming

Andy Hernandez

I think just doing a lot of practice problems is beneficial in memorizing the shapes and bond angles and becoming more familiar with the molecules. I also think that being able to visualize the 3D shape of the molecule is helpful. One of the UA's shared this website with us: http://intro.chem.oksta...

Andy Hernandez

Although there are 4 bonding regions for H20, there are still 2 lone pairs, makes the shape of molecule bent since the two lone pairs are pushing the electrons from the two bonded atoms

Andy Hernandez

Lone pair electrons do count as their own region of electron density

Andy Hernandez

Equitorial planes are basically side to side while axial is up and down. so like in an xy graph, y is axial, and x is equitorial

Andy Hernandez

count the regions of e- density which is the number of bonds and lone pairs

Andy Hernandez

sp3 bc regions of e- density equals the number of hybrid orbitals. 1 LP plus 3 bonds equal 4 areas of e- density so its sp3

Andy Hernandez

sigma bonds are just single bonds and pi bonds are in triple and double bonds. However, in a double bond, one is a sigma bond and the other is a pi bond. And in triple there are 2 pi bonds and one sigma bond

Andy Hernandez

Its easier if you write down the notes he gave in the lecture and have them at hand to refer to. Like by figuring out the regions of e- density you can figure out # of hybrid orbitals, and what I do is just have my notes to refer to, to figure out the hybridization formula. Gonna take some memorizat...

Andy Hernandez

You calculate the regions of e- density to get the number of hybrid orbitals

Andy Hernandez

its sp3 bc the number of regions of e- density is 4, 1 lone pair and 3 bonds

Andy Hernandez

When trying to find the hybridization orbitals look for the regions of e- density. C and O in that problem have 4 areas, u get sp3, S P P P being the 4 different orbitals that can have electrons.

Andy Hernandez

What are the negative impacts of changing it to pass/ no pass?

Andy Hernandez

Sameeee. Before he posted the grades i knew for a fact i missed five questions and im [censored] bruh there goes my grade. I ended getting a 76% and im not proud of it but I'l take it. Now to grind for the next one ye

Andy Hernandez

Not me barely catching up on lectures and sapling haha. I kinda like the last minute study grind but its very stressful

Andy Hernandez

The way I remember cations and anions is that cations have a "t" which closely resembles a "+" sign. So elements with the "+" are cations which means an e- was removed. And basically once you know what a cation is, one can deduce that an anion is the opposite.

Andy Hernandez

The way I remember cations and anions is that cations have a "t" which closely resembles a "+" sign. So elements with the "+" are cations which means an e- was removed. And basically once you know what a cation is, one can deduce that an anion is the opposite.

Andy Hernandez

Polarizability is how easily an electron cloud is distorted by an electric field. E- disortion is proportional to the polarizability of e-

Andy Hernandez

I throw my phone against the wall and attempt to not touch it for at least an hour. If you're stuck, try to have a couple people you can ask questions to and hopefully they can explain it to you.

Andy Hernandez

I want to be in in-person classes :(. Harder for me to concentrate online and it's harder to make friends to study with. Got LS30 midterm this upcoming week and im nervous.

Andy Hernandez

resonance means electrons are delocalized which means it's more stable.

Andy Hernandez

triple bonds are the shortest, next is second, finally single bonds r the longest

Andy Hernandez

As we go across a period, the number of protons increase one by one, it results in a progressively higher electrostatic attraction

Andy Hernandez

thanks this helped so much!!!

Andy Hernandez

Atomic radius increases as we move along the periodic table

Andy Hernandez

Why is 4s filled first?

Andy Hernandez

400-700 visible light aka balmer series, 100-120, UV aka Lyman

Andy Hernandez

2.998*10^8

Andy Hernandez

Early appreciation post saying thanks for chem community bc this forum is saving me

Andy Hernandez

Hey, I have question from this same module. Question 30. "Light hits a sodium metal surface and the velocity of the ejected electron is 6.61 x 105 m.s-1. The work function for sodium is 150.6 kJ.mol-1. .... What is the frequency of the incident light on the sodium metal surface?" Are you ...

Andy Hernandez

A tip for anyone seeing this. I kept getting the wrong answer bc i didn't put parantheses around (1mol/ Avogdro's constant) so make sure to do that. I was stuck on this problem for thirty minutes bc of this :(

Andy Hernandez

angstrom is 10^-10

Andy Hernandez

Wait, so what's the answer?

Andy Hernandez

anyone want to form study groups for the midterm?

Andy Hernandez

Im seeing this post from a few years ago and a reply said "I'm creating multiple review sessions for midterms/finals" and I assume it was Dr Lavelle or someone with the influence to create them. Will these session be created for the upcoming midterm in week 4?

Andy Hernandez

Unless specified, its ok to write in either format

Andy Hernandez

I believe we can use our phones instead so maybe you can pursue that option instead of buying one.

Andy Hernandez

yes, the threshold is the same thing as the work function

Andy Hernandez

How did you figure out how to do homework problems you were confused on? with covid and all, I'm having trouble even figuring out the basics of chem.

Andy Hernandez

That was very helpful, thanks for the help.

Andy Hernandez

Coming from 2020 student, I'm semi-lost haha. Online is definitely not fun.

Andy Hernandez

Coming from 2020 student, I'm semi-lost haha. Online is definitely not fun.

Search found 56 matches