## Search found 10 matches

Sun Oct 29, 2017 11:45 pm
Forum: Lewis Structures
Topic: Homework 3.71 [ENDORSED]
Replies: 3
Views: 240

### Homework 3.71[ENDORSED]

How do we know which structure would more likely make the dominant contribution to a resonance hybrid? Does it have to do with the structure with the lower energy?
Sun Oct 29, 2017 11:36 pm
Forum: Lewis Structures
Topic: Lewis Structures
Replies: 10
Views: 443

### Re: Lewis Structures

I was wondering the same thing but I think we only need to include it when we're instructed to do so.
Sun Oct 22, 2017 11:41 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration of Th [ENDORSED]
Replies: 3
Views: 409

### Re: Electron Configuration of Th[ENDORSED]

correction: [Rn]6d27s2
Sun Oct 22, 2017 3:07 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration of Th [ENDORSED]
Replies: 3
Views: 409

### Electron Configuration of Th[ENDORSED]

Why is the electron configuration of Thorium [Re] 7s2, 6d2? I thought Th would be part of the f-block?
Sat Oct 21, 2017 10:07 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Homework 2.29 (c)
Replies: 2
Views: 195

### Re: Homework 2.29 (c)

Oh, I see! Thank you!
Sat Oct 21, 2017 6:18 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Homework 2.29 (c)
Replies: 2
Views: 195

### Homework 2.29 (c)

Why is n squared? Do we only square it if it's the only thing that's given? It's a bit unclear to me because we don't have to square it when there's other given information.
Sun Oct 15, 2017 3:11 am
Forum: Properties of Electrons
Topic: Problem 1.33
Replies: 2
Views: 224

### Problem 1.33

Why is work function = 16.565 x 10^-18 J? That is, is the work function always going to be attained by multiplying Planck's constant (h) with frequency ?
Fri Oct 13, 2017 10:05 pm
Forum: Einstein Equation
Topic: Ek = 1/2 me v^2
Replies: 3
Views: 301

### Ek = 1/2 me v^2

Ek = 1/2 me v^2

In this formula for kinetic energy, will me always be 9.109 x 10^-31 kg?
Sun Oct 08, 2017 12:31 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: E.15 [ENDORSED]
Replies: 10
Views: 739

### Re: E.15[ENDORSED]

You use, m = nM.

The molar mass of NaHSO4 is 120.06 and you plug this value in for M, thus, the equation would look like this:

m = (0.20 mol)(120.06 g mol-1) = 24.01 g
Sat Oct 07, 2017 11:22 pm
Forum: SI Units, Unit Conversions
Topic: Sig Figs [ENDORSED]
Replies: 16
Views: 1962

### Re: Sig Figs[ENDORSED]

I think that the rule of final and trailing zeros are what poses the most challenge to me. Thank you for all the clarifications regarding rules of zeros. It was definitely helpful.