Search found 14 matches

by FCervania 1B
Sun Jul 30, 2017 5:56 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Problem 11.37 Help
Replies: 1
Views: 205

Problem 11.37 Help

I get how a is 1/41 because it's just the reverse equation,
but
Initially, I thought b) 41/2, and c) 41 * 2.

Can someone explain how they got

b) sqrt (41)
c) 41^2

Thank you
by FCervania 1B
Sun Jul 30, 2017 5:51 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Direction of reaction when Q<K and Q>K
Replies: 2
Views: 213

Re: Direction of reaction when Q<K and Q>K

Any easy way to remember this is always think of their order in the alphabet! P Q R if we say P= product R= reactant and Q is to be replaced with an arrow, we get 2 options. **Make sure you compare as Q (either < or >) K, not K (< or >) Q, or this tip won't work!** If Q > K, then the inequality sign...
by FCervania 1B
Sun Jul 30, 2017 5:42 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 11.27 versus 11.31
Replies: 2
Views: 192

Re: 11.27 versus 11.31

They both have the format K = Partial Pressure of Products/ Partial Pressure of Reactants Everything on the right side of the equilibrium equations will always be designated as the product(s), so in this case the products are PCl3 and PCl2! What 11.27 does a bit differently is you are given K at the...
by FCervania 1B
Sun Jul 30, 2017 5:22 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: X-->0 when?
Replies: 2
Views: 249

Re: X-->0 when?

Refer to the 3rd video module about Equilibrium on the course site online: X --> 0 is an approximation made essentially when there is a cubic X in the equilibrium equation. We can make this assumption if we know that the equilibrium constant is less than 10^-4. What can we do with the knowledge? Wel...
by FCervania 1B
Sun Jul 16, 2017 2:02 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Quick Question about SO4
Replies: 8
Views: 715

Quick Question about SO4

Hello, I was looking at the SO4 Lewis Diagrams on page 82 of the course reader, and was wondering how exactly it was determined that Structure B is a more stable structure. I understand later we learned that double bonds are stronger, but if all we have was the bonds to electrons, then don't we alre...
by FCervania 1B
Sun Jul 16, 2017 1:45 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: How to display polar dipole moments in VSEPR model
Replies: 2
Views: 362

How to display polar dipole moments in VSEPR model

Hello, I was wondering what the arrows mean on a VSEPR model and how it displays the dipole moment. I don't understand how the VSEPR model of CCl4 shows nonpolar dipole moments and CHCl3 shows polar dipole moments, is it simply the presence / absence of the arrows in the diagram? Can't you still dra...
by FCervania 1B
Sun Jul 16, 2017 1:28 pm
Forum: Lewis Structures
Topic: Seesaw Structure question
Replies: 3
Views: 583

Seesaw Structure question

Hello, Can someone explain why the seesaw structure of SF4 is preferred instead of placing the lone pair at the "top" of the pyramid? I understand the goal is to get less repulsion, but how does placing the lone pair in the "middle" of a seesaw creates less repulsion rather than ...
by FCervania 1B
Sun Jul 16, 2017 1:03 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angle question when Lone pair exists
Replies: 1
Views: 206

Bond Angle question when Lone pair exists

Hello,

Can someone explain why the angle gets smaller when there are more lone pairs present in an atom?
Is it simply because it "pushes" the other atoms lower? in that case shouldn't the bond angle get bigger with more lone pairs?
by FCervania 1B
Sun Jul 09, 2017 12:22 am
Forum: Properties of Light
Topic: Ch1 problem9
Replies: 3
Views: 303

Ch1 problem9

Hello, I was so closeee to getting this problem 100% right. Can someone please walk me through how to do the last line, (with 2.5 nm given) Also I did not know how to assign the activity to their respective wavelengths, how do we know which is which (especially since reading and suntan got very clos...
by FCervania 1B
Sun Jul 09, 2017 12:14 am
Forum: Properties of Light
Topic: Ch1 Problem 11 help
Replies: 1
Views: 244

Ch1 Problem 11 help

Hello, I understand that the series are all in separate parts of the spectrum, and how they are found by using the Rydberg constant at different starting points for N, but I don't understand what makes it necessarily logical/ Like I don't understand the answer in the solution manual either, an someo...
by FCervania 1B
Wed Jul 05, 2017 1:06 pm
Forum: Properties of Light
Topic: Unable to attend TA's review section today (7/5/17)
Replies: 1
Views: 179

Unable to attend TA's review section today (7/5/17)

Can someone please post which questions / concepts were went over please? Thank you!
by FCervania 1B
Sun Jul 02, 2017 1:35 pm
Forum: Properties of Light
Topic: What exactly did the Photoelectric experiment show?
Replies: 2
Views: 220

Re: What exactly did the Photoelectric experiment show?

Oh okay: so if using red light, despite the higher intensity of the light, it won't eject electrons, but blue light (since it has higher frequency), regardless of the intensity (!) it will eject electrons, and the difference lies in the photons which contain different energy levels. So the photons g...
by FCervania 1B
Sun Jul 02, 2017 1:27 pm
Forum: Molarity, Solutions, Dilutions
Topic: Problem E.15 in Fundamentals
Replies: 3
Views: 354

Re: Problem E.15 in Fundamentals

This was so helpful, thank you! (I was spending like 5 mins looking for some element that had the symbol M and felt I was going a bit crazy lol)
by FCervania 1B
Sun Jul 02, 2017 12:08 pm
Forum: Properties of Light
Topic: What exactly did the Photoelectric experiment show?
Replies: 2
Views: 220

What exactly did the Photoelectric experiment show?

I understand that prior to the experiment, we thought that light had wave like properties. But when increasing intensity to a single point on a metal surface, it did not reflect(?) as much as we expected- Which means light.. isn't a wave entirely(??) I'm missing something, can someone explain the th...

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