CHEMISTRY COMMUNITY

Rachel Min

The Lewis acid and base definition is more general that the Bronsted definition, so a Bronsted base/acid is a Lewis base/acid but not all Lewis acids/bases are Bronsted acids/bases (think rectangle and square definition). I usually see Lewis acids as "cations" (sometimes they are actually ...

Rachel Min

Hi! I'm just confirming that titrations are not on the final right? I think he sent out an email and I don't remember him really going over it in class but I have also been really sleep deprived lately...

Rachel Min

No problem!

Rachel Min

Thank you! This really helped a lot! :)

Rachel Min

You are welcome to do it if you want, but I don't think that it will be a huge deal if it isn't perfect. As long as you don't do something like making 90 degrees a wildly acute angle, I think you'll be fine. Hope this helps!

Rachel Min

Why is it that you can have two pi bonds and a sigma bond in a triple bond but not two sigma bonds and one pi bonds? Does it only have to do with the way that the bonds form? Like the shape and placement?

Rachel Min

How exactly do we know which elements can do electron promotion? The book says that elements that have empty orbitals can, like carbon and boron, but can the transition metals also go through electron promotion?

Rachel Min

I think there may be a "curve" like a dropped test score? He does say that you need a 50% to pass the class and says that's a C- so maybe he doesn't want us to worry about a curve and just has mercy on us later on? Older years say it's a dropped test score but I'm not really sure. Sorry I ...

Rachel Min

Do you know if Ch.5 or another chapter will be on our next test as well, or if it will only be on our final? Since we won't have a test next week, I'm wondering if that would happen?

Rachel Min

Is the best indicator of when to use E=hv vs. E=Ek+work function just whether or not the question asks about a photon or electron? I know sometimes we need to find the energy of photons for the work function equation, but is that for the threshold energy or just the normal energy? I don't think my q...

Rachel Min

He went over them and the equation in class, but I doubt it will be a big part. Just know the concept behind it. Hope this helps!

Rachel Min

Thank you for all the explanations! They really helped.

Rachel Min

Thank you! This really helped!

Rachel Min

I'm still confused about how exactly we (or whoever came up with this quantum number) got the numbers -1/2 and +1/2 to describe electron spin. Is there a more conceptual reason behind it? Or did some kind of math just work out like that?

Rachel Min

A diagonal relationship means that since the trends for the periodic table are moving up and over in a direction (like how size increases moving to the left and down on the periodic table), elements on the periodic table that are diagonal from each other (usually in periods 2 and 3) have some simila...

Rachel Min

Just wanted to confirm that the unexpected result of the photoelectric experiment was that the intensity of radiation had no effect on the amount of electrons booted off the metal as long as the wavelength wasn't right? I'm still slightly confused.

Rachel Min

It's mostly intuitive, so when the electron releases energy you use the negative sign. If you look at the equation: frequency=R(1/n^2-1/n^2) and problem 1.13 you can see that the electron releases energy and you subtract 1/4-1/16 as you know you are going from a place of higher energy to lower. It i...

Rachel Min

Blackbodies absorb all light and don't emit any at thermal equilibrium, and emit thermal radiation.

Rachel Min

Can someone explain to me what a blackbody is and its function pertaining to what we're learning?

Rachel Min

It would be 0.0048 since the two zeroes after the decimal but before the 48 do not count as sig figs. Hope this helps!

Rachel Min

What does a trendy, basic chemist eat for breakfast?

Avogadro Toast.

CHEMISTRY COMMUNITY

Search found 21 matches

Re: Bronsted vs. Lewis

Re: Final exam [ENDORSED]

Re: Drawing

Re: Sigma and Pi Bonds

Re: Drawing

Sigma and Pi Bonds

Electron Promotion

Re: Midterm on myucla

Re: Chapter 4

E=hv vs. Work Function?

Re: Midterm [ENDORSED]

Re: Unexpected Result [ENDORSED]

Re: Electron Spin Quantum Number [ENDORSED]

Re: Electron Spin Quantum Number [ENDORSED]

Re: 2.71

Unexpected Result [ENDORSED]

Re: Question about the Negative Sign in En = -hR/n^2

Re: Black Body Radiation [ENDORSED]

Blackbody

Re: Rounding [ENDORSED]

Re: Post All Chemistry Jokes Here