Search found 21 matches

by Rachel Min
Fri Dec 08, 2017 1:39 pm
Forum: Lewis Acids & Bases
Topic: Bronsted vs. Lewis
Replies: 6
Views: 251

Re: Bronsted vs. Lewis

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 ...
by Rachel Min
Fri Dec 08, 2017 1:26 pm
Forum: Administrative Questions and Class Announcements
Topic: Final exam [ENDORSED]
Replies: 7
Views: 457

Re: Final exam [ENDORSED]

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...
by Rachel Min
Wed Nov 29, 2017 6:13 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Drawing
Replies: 3
Views: 182

Re: Drawing

No problem!
by Rachel Min
Wed Nov 29, 2017 6:09 pm
Forum: Sigma & Pi Bonds
Topic: Sigma and Pi Bonds
Replies: 5
Views: 394

Re: Sigma and Pi Bonds

Thank you! This really helped a lot! :)
by Rachel Min
Wed Nov 29, 2017 6:08 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Drawing
Replies: 3
Views: 182

Re: Drawing

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!
by Rachel Min
Sat Nov 25, 2017 9:44 pm
Forum: Sigma & Pi Bonds
Topic: Sigma and Pi Bonds
Replies: 5
Views: 394

Sigma and Pi Bonds

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?
by Rachel Min
Sat Nov 25, 2017 9:41 pm
Forum: Hybridization
Topic: Electron Promotion
Replies: 1
Views: 102

Electron Promotion

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?
by Rachel Min
Fri Nov 17, 2017 8:33 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm on myucla
Replies: 6
Views: 348

Re: Midterm on myucla

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 ...
by Rachel Min
Fri Nov 17, 2017 8:29 pm
Forum: Administrative Questions and Class Announcements
Topic: Chapter 4
Replies: 3
Views: 200

Re: Chapter 4

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?
by Rachel Min
Thu Nov 09, 2017 5:05 pm
Forum: DeBroglie Equation
Topic: E=hv vs. Work Function?
Replies: 2
Views: 558

E=hv vs. Work Function?

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...
by Rachel Min
Thu Nov 09, 2017 4:58 pm
Forum: Dipole Moments
Topic: Midterm [ENDORSED]
Replies: 5
Views: 346

Re: Midterm [ENDORSED]

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!
by Rachel Min
Thu Nov 02, 2017 9:44 am
Forum: Photoelectric Effect
Topic: Unexpected Result [ENDORSED]
Replies: 4
Views: 337

Re: Unexpected Result [ENDORSED]

Thank you for all the explanations! They really helped.
by Rachel Min
Thu Nov 02, 2017 9:41 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Electron Spin Quantum Number [ENDORSED]
Replies: 12
Views: 764

Re: Electron Spin Quantum Number [ENDORSED]

Thank you! This really helped!
by Rachel Min
Fri Oct 27, 2017 1:15 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Electron Spin Quantum Number [ENDORSED]
Replies: 12
Views: 764

Re: Electron Spin Quantum Number [ENDORSED]

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?
by Rachel Min
Fri Oct 27, 2017 1:08 pm
Forum: Trends in The Periodic Table
Topic: 2.71
Replies: 1
Views: 180

Re: 2.71

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...
by Rachel Min
Thu Oct 19, 2017 9:45 am
Forum: Photoelectric Effect
Topic: Unexpected Result [ENDORSED]
Replies: 4
Views: 337

Unexpected Result [ENDORSED]

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.
by Rachel Min
Thu Oct 19, 2017 9:40 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Question about the Negative Sign in En = -hR/n^2
Replies: 5
Views: 297

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

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...
by Rachel Min
Fri Oct 13, 2017 2:48 pm
Forum: *Black Body Radiation
Topic: Black Body Radiation [ENDORSED]
Replies: 5
Views: 958

Re: Black Body Radiation [ENDORSED]

Blackbodies absorb all light and don't emit any at thermal equilibrium, and emit thermal radiation.
by Rachel Min
Fri Oct 13, 2017 2:15 pm
Forum: *Black Body Radiation
Topic: Blackbody
Replies: 2
Views: 277

Blackbody

Can someone explain to me what a blackbody is and its function pertaining to what we're learning?
by Rachel Min
Tue Oct 03, 2017 8:44 pm
Forum: Significant Figures
Topic: Rounding [ENDORSED]
Replies: 2
Views: 196

Re: Rounding [ENDORSED]

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!
by Rachel Min
Tue Oct 03, 2017 8:36 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 891158

Re: Post All Chemistry Jokes Here

What does a trendy, basic chemist eat for breakfast?

Avogadro Toast.

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