CHEMISTRY COMMUNITY

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There is an inverse relationship between acid and conjugate base/ base and conjugate acid.

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Amphoteric compounds are compounds that can act as both an acid and a base. In class he showed examples of acid and base reactions that involved water. Water can act as both an acid and a base as it can accept H+ to become H3O+ and donate H+ to become OH-. There are also a couple of nonmetal and me...

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What exactly is protonation? What is happening to an acid undergoing protonation?

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Emma Popescu 3D wrote:If you have the pH of a solution, you can calculate its pOH or vice versa. For example, if the pH is 2 then the pOH will be 14-2=12

Just to clarify, they always add to 14?

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Can someone explain what pOH is in a little bit more detail?

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Does a lot of the material from 14a come up again in 14b or is it mainly new concepts?

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Can someone explain the sigma and pi bond question from Test 2? I believe there was also a hydrogen bonding component to the question as well.

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rohun3H wrote:It is most useful to know the patterns of the periodic table.

Are there any exceptions?

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daniella_knight1I wrote:If you see a Ka or Kb constant that's a giveaway. If not you'll have to draw out the lewis structure and look at the lone pairs to determine if it's a weak acid or base.

Just clarifying that if you see a constant it is most likely a weak acid, not a strong one.

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Will we use both in this class? Or will we use one more so than the other?

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Does strength of bonds relate to its melting point?

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I always get really bad anxiety during test week to the point where I get sick and throw up or am constantly nauseous. Anyone have ideas for how to help while also being able to study? You could try meditating and planning little study breaks to look forward to. Also, try to think about tests in th...

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I have had a problem on a test that had an answer that was only covered in the textbook, not in lecture at all. So, I would say definitely at least skim the textbook chapters.

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A very simplified/juvenile way to think of formal charge is FC = Valence E - (# sticks + # dots). Sticks being bonds and dots being single electrons in lone pairs.

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What are all of the kinds of intermolecular forces?

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Can someone explain the exception for oxygen and nitrogen? It was on the midterm and I got it wrong.

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What is dipole-dipole? I know we talked about it a lot in class but I am still confused.

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Can anyone sum up the exceptions into one post so I can memorize?

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Jose Robles 1D wrote:https://www.sciencedaily.com/releases/2019/11/191104130450.htm

Interesting article that I thought you should look at.

For anyone who is feeling lazy, the article is titled: Light-based 'tractor beam' assembles materials at the nanoscale

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Muj_Rahman_3B wrote:Researchers have been using two different types of brain scanners on babies to check, as the title says, their "brain chemistry." Here's it is.

https://www.sciencedaily.com/releases/2 ... 160940.htm

Thats interesting!

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Basically an atom that has electron lone pairs or is sharing electrons I believe.

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A mole is the SI unit for a quantity of something

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McKenna_4A wrote:I can't log into Dr. Lavelle's website. I enter my password and it just loads for a second and nothing happens. I don't get any "wrong password" notification or anything. Anybody else having this problem/have a solution?

Switch your browser to chrome or safari.

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VioletKo3F wrote:Does anyone know if we'll get the actual midterm back? Or is it only our grades?

You should get the whole midterm back.

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Do we need to write out and cross out every unit or is it safe to skip a few of these steps as long as our answer is in the correct unit?

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Is it okay to break the octet rule in order to minimize formal charge?

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Is work function, Φ used in any other equations besides the KE/Energy of a photon one?

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Kinetic energy + O[strike] = the energy of a photon? What is the O with a strike through it representing?

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Can you explain what the lone pairs part of the equation means and maybe give an example? Thank you!

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So the units are essentially equivalent to each other?

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Vuong_4G wrote:Not sure if this is what you're looking for but...

c = $\lambda$ $\nu$
E(photon) = h $\nu$
$\frac{1}{2}$ m* $v^{2}$ = E(photon) - $\phi$
$\lambda$ = h/p

Could you explain wavelength = h/p to me please?

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Will we ever use wavelength x frequency = velocity? or will it always be =c(speed of light)

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Can someone explain what a shell is vs a subshell?

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Will any of the content from test 1 be on the midterm and/or test 2?

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Any other tips for what to study/how to prepare for test two?

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Emily_4B wrote:Is there any case where the atoms lewis structure doesn’t have a full octet?

I also was wondering about this question? Are there any exceptions to the rules that we should memorize?

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In discussion someone mentioned a noble gas rule/shortcut when we were discussing periodic table trends? Does this relate to electronegativity? If not, can someone explain what it is?

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Is an ionic or a covalent bond typically stronger?

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I have a question regarding one of the post assessment questions (28b) from the atomic spectra module. In this problem, the units kJ/mol are used. In solving it, I just thought to use the kJ->J conversion but still ended up with the wrong answer. I'm not sure if I made just a calculation mistake or...

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I think it just means to use the De Broglie equation because the De Broglie equation is derived from the equations E=pc, c= wavelength*frequency, and E=hv which we have learned before. However, this equation only works for any particle with a rest mass, momentum, and wavelength so if it asks for th...

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Electronegativity is related to the electron-pulling ability of an atom. Elements at the top right corner of the periodic table have the highest electronegativity, meaning that electronegativity increases as you move right across the table and decreases as you move down. I have been looking for an ...

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Schrodinger's equation predicts future dynamic systems via calculating the partial differentiation of wave functions, or how the electron will behave around its nucleus. Most likely, you will not have to calculate anything with the equation itself, but you should at least know what each part of the...

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Sam McNeill 3A wrote:A photon is the quanta, or smallest measurement, of light.

What unit is this measurement in?

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Is anyone familiar with Dr. Lavelle's rule for rounding to the nearest even number when there are 4 sig figs and you can only have 3? I don't think I've heard him talk about this. Is this a rule that isn't standard, but Dr. Lavelle wants us to apply? And what do you mean by the nearest even number ...

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Do you recommend taking chem 17 before chem 14a?

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What is a real-world application of this equation?

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Getting a good night's sleep is huge! If you've been studying for hours, just go to bed!! Give your brain some time to process everything in the meantime.

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Is anyone familiar with Dr. Lavelle's rule for rounding to the nearest even number when there are 4 sig figs and you can only have 3?

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What was the scam for workshops that Dr. Lavelle mentioned in lecture? Something to do with asking for our phone numbers?

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When would I use this in a calculation, like what would the problem be asking?

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I spoke with one of the UA's and went to their Step-Up session on Tuesday and they really recommended taking advantage of the resources available. For instance, the Step-Up session really helped me solidify my confidence in certain skills and identify areas I am weaker in. They gave us a bunch of p...

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It is looking like I will have to fly home on the Tuesday before Thanksgiving too. Will I be penalized for missing lecture?

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Do we need to bring any materials/resources to the test? Calculator, Periodic Table, etc?

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Does anyone know if we will get our homework back with comments or corrections from our ta?

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Here are a couple rules I found online: Non-zero digits are always significant. Any zeros between two significant digits are significant. A final zero or trailing zeros in the decimal portion ONLY are significant. My question: When you say 'any zeros between two significant digits are significant',...

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