CHEMISTRY COMMUNITY

Sears 4A

most of the molecules we have been and will deal with will be sp3d and so on; its unlikely there will ever be a sp2d

Sears 4A

yeah as a molecule gains electrons, it becomes hard for the molecule to gain more, making the kA lower

Sears 4A

the more stable the anion on its own, the more likely the acid is to be strong because it is more likely to dissociate in water

Sears 4A

can someone quickly summarize how you find the oxidation number of an atom? is it the same as formal charge?

Sears 4A

stronger bonds between atoms mean it is more difficult for that molecule to dissociate fully (which is the definition of a strong acid)

Sears 4A

linear: 2 regions of electron density, 2 bonds
bent: 4 regions of electron density, 2 bonds

Sears 4A

kahn acadmey, and as many practice problems from the textbook i can possibly do

Sears 4A

you can use de Broglie for something other than an electron (its anything that has mass), but i think were mostly expected to use it for electrons. im pretty sure the problem would clearly state the mass of another particle if they expected us to do that

Sears 4A

yeah i dont think he curves tests but curves the final grades

Sears 4A

"Out of acetic acid and formic acid, formic acid is considered stronger because the CH3 in acetic acid is electron donating. The CH3 actually contributes electron density towards the O-H bond, making it harder to remove the H, and making acetic acid a weaker acid than formic acid."

Sears 4A

do we need to put the energy level into our answers when we write down hybridized orbitals?

Sears 4A

however many regions of electron density an atom has, it will have exactly that many hybrid orbitals, even if they are lone pairs

Sears 4A

5 regions of electron density: 3 bonded, 2 lone pairs

Sears 4A

it means that energy in the form of heat is input into the reaction to make it occur (endothermic)

Sears 4A

yeah i dont think were expected to know how to calculate exact bond length for any tests in this course

Sears 4A

hybridization works when an atom is bonded to another atom that has electrons that exist within a different electron energy level

Sears 4A

I agree, I believe it would be a Lewis base because of the lone pairs on the sulfur --> working as an electron donor.

Sears 4A

I don't think you need to find the exact pH, I think the question is more about analyzing whether or not these salts would dissolve in water and make the solution acidic (pH<7) or basic (pH>7). You'd have to analyze how the dissociated salt would interact with water and whether or not it would creat...

Sears 4A

I'm pretty sure the following shapes are the ones we need to know: linear trigonal planar bent tetrahedral trigonal pyramid bent trigonal bipyramid seasaw t-shape octahedral square pyramid square planar Pro-tip, if you google "VSEPR Chart" on Google Images you can find a really helpful cha...

Sears 4A

I also find manipulating it first to be easier, but doing that you can easily mix up signs are start getting wrong numbers. If you wanna manipulate it before, just be careful with your +/- signs.

Sears 4A

Can someone run through what each part of the equation is? I am super super lost on this concept

Sears 4A

Can someone lay out the order in which we are supposed to fill each orbital when doing electron configurations? I know some of the energy levels do not necessarily go in the same order as you would expect (4s before 3d for example) so I am a bit confused. Are we going to be given an outline of the e...

Sears 4A

Can someone lay out the order in which we are supposed to fill each orbital when doing electron configurations? I know some of the energy levels do not necessarily go in the same order as you would expect (4s before 3d for example) so I am a bit confused. Are we going to be given an outline of the e...

Sears 4A

Does anyone know if there are any workshop sessions this week (week 6)? I know there were many step-up, drop-in, and workshop sessions last week but looking for one to go to this week. Thanks

Sears 4A

If we are given a wavelength of a line in a certain series of the atomic spectra, how do we go about calculating which energy levels that H atom transitioned from? I am referring problem 1.15 in section 1A of the Quantum section of the textbook

Sears 4A

KHowe_1B wrote:What exactly is the Rydberg equation and how do you know when to use it?

Dr. Lavelle said he does not expect us to memorize the Rydberg equation since it is such a shortcut, but would rather us understand the steps to how the equation was made in the first place to solve problems.

Sears 4A

I don't want to be that person but what does dimensional analysis mean? Dimensional analysis is the process for solving problems where you multiply out the needed ratios (mole/mole, grams/mole, grams/L) and cancel out the units in order to get the correct answer. You know which ratios you need depe...

Sears 4A

If i have a discussion on Tuesday, am I expected to cover topics that Dr. Lavelle will be discussing later in the week in my week 3 homework, or can I focus on quantum (light properties, spectra etc.) since I have not been to a lecture for the new material yet?

Sears 4A

LeAirraBullingor3k wrote:I don't know if someone has asked this already but would we get partial credit for unfinished problems headed in the right direction?

I believe so, yes. Dr. Lavelle mentioned in lecture to always try to solve as much of the problem as possible which leads me to believe partial credit will be given.

Sears 4A

Can someone explain what Angstroms are? I was confused on the test on this question. Angstroms are a unit of length equivalent to 10^(-10) m. I was taken aback by this question on the test as I do not ever remember being told we had to memorize the quant. value of Angstroms. Did I miss that in clas...

Sears 4A

I also always start by balancing anything that is not carbon, oxygen, or hydrogen. In most equations theres is a good chance youll have some form of a hydrocarbon or oxygen or water, so by balancing other elements first you can then remedy the unbalanced elements easily with O2, H2O, etc.

Sears 4A

I understand how to find empirical formulas, but am unclear on how you would transfer that into a molecular formula. What kind of further information do you need to find the true molecular formula?

Sears 4A

I usually use the entire mass given on the table, so 2 decimal places, and then follow my sig figs from there

Sears 4A

I usually use the entire mass given on the table, so 2 decimal places, and then follow my sig figs from there

Sears 4A

I haven't totally gotten a grip back on how to compare reactants in order to determine which one is limiting, anyone have any tips? I understand we have to compare how many moles of each with respect to the equation, but I do not fully get how to reason through that.

Sears 4A

I do not think we are covering this until week 2, and the week 2 homework can be from review or quantum, so maybe wait until Dr. Lavelle goes over this in lecture!

CHEMISTRY COMMUNITY

Search found 36 matches

Re: sp3d and onward

Re: Ka value

Re: How does anion stability contribute to relative acidity?

Re: Application of oxidation number

Re: HF is a weak acid?

Re: Bent vs linear

Re: Review in General

Re: De Broglie Wavelength

Re: Grades

Re: 6C.21b

Re: Hybridization General Question

Re: 2.45 Hybridization

Re: T-shape

Re: Delta Over Reaction Arrow

Re: 2D. 19

Re: hybridization

Re: Lewis Structure of CH3S-

Re: 6D11

Re: What are the names of the geometries that we must know? [ENDORSED]

Re: Manipulating for the initial energy level

Re: Heisenberg Indeterminacy Equation

Electron Configuration

Electron Configuration

Re: 10/28 Updates due to Fire [ENDORSED]

Atomic Spectra!!

Re: Rydberg equation [ENDORSED]

Re: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]

Week 3 Homework Topics

Re: Test 1 [ENDORSED]

Re: Test 1 [ENDORSED]

Re: Homework Question H11

Empirical to Molecular Formulas [ENDORSED]

Re: What decimal place to round to when taking masses from the Periodic Table?

Re: What decimal place to round to when taking masses from the Periodic Table?

Limiting Reactant Tips

Re: Uncertainty in Speed [ENDORSED]