## Search found 11 matches

Wed Jul 26, 2017 9:41 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Course Reader Example on Pg. 154
Replies: 2
Views: 330

### Course Reader Example on Pg. 154

Professor Lavelle explained why CCl3COOH is a stronger acid than CH3COOH. If anyone could just briefly explain this again please. I know that he mentioned the resonance and polarity of one of them accounts for this but I honestly spent half my time in lecture blowing my nose or holding in a sneeze :...
Wed Jul 26, 2017 9:32 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Dilution, HW Problem #12.33
Replies: 1
Views: 263

### Dilution, HW Problem #12.33

Hi guys! This is a pretty long problem, and I could use some walking through to clarify on how to solve. We start with added solid Na2O to a 200 mL flask, which is filled with water resulting in 200 mL of NaOH solution. 5.00mL of this is transferred to another flask and diluted to 500 m. The pH of t...
Tue Jul 18, 2017 11:47 pm
Forum: Octet Exceptions
Topic: Octet Rule Clarification
Replies: 2
Views: 521

### Octet Rule Clarification

I've seen that many have asked before me and I just want to check my understanding. Essentially any atom, those in period 3 and after that have electrons that start filling the d orbital, can break the octet rule?
Tue Jul 18, 2017 11:36 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Ground Configuration 3.21
Replies: 1
Views: 565

### Electron Ground Configuration 3.21

B) In2+, I am confused as to why its e- configuration is [Kr] 4d105s2 rather than [Kr] 4d105s1. Since this cation lost two electrons, isn't one taken from the p orbital and the other from the s orbital? D) Ag+, its correct configuration is [Kr] 4d10, but 4d10 would be as if the atom gained an e- rat...
Tue Jul 18, 2017 11:25 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Ground State Configuration 3.19
Replies: 1
Views: 309

### Ground State Configuration 3.19

The question asks for the ground state configuration and # of unpaired electrons. Part E) Ni2+, the textbook says it is [Ar] 3d8 with two unpaired electrons, but to me it makes sense for it to be [Ar] 3d6 since 3d8 IS nickel and we're given a cation. Is this because the two electrons are taken away ...
Tue Jul 11, 2017 10:42 pm
Forum: *Shrodinger Equation
Topic: Example from Summer Test #1, Question 4a [ENDORSED]
Replies: 2
Views: 395

### Example from Summer Test #1, Question 4a[ENDORSED]

In the question, we're told the electron transitions from n=3 to n=1. So, our initial is 3 and final is 1. We should apply the concept, Ef-Ei. I am confused because in the answer, the way it was solved shows ...(1/3^2 - 1/1^2). Why is this?
Tue Jul 11, 2017 3:26 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Shielding and Effective Nuclear Charge
Replies: 2
Views: 419

### Re: Shielding and Effective Nuclear Charge

sure does, thanks!
Mon Jul 10, 2017 8:47 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Shielding and Effective Nuclear Charge
Replies: 2
Views: 419

### Shielding and Effective Nuclear Charge

Hi there, Can someone better explain the relationship between shielding and effective nuclear charge? To my understanding, shielding reduces this charge, but physically, what is happening to the electrons inside the nucleus. Is the charge reduced because there is no need to have so much power to pul...
Mon Jul 10, 2017 7:56 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Exercise 2.29
Replies: 10
Views: 1851

### Re: Exercise 2.29

I will cover this in class in detail. This question is about 20 pages ahead of what we have covered. I am confused with this question which asks "How many electrons can have the the following quantum numbers in an atom, a) n=2, l-1 b)n=4, l=2, m1=-2 c) n=2 d) n=3, l=2, m1=+1 ?" and with 2...
Tue Jul 04, 2017 9:55 pm
Forum: Photoelectric Effect
Topic: Question from Photoelectric Effect Pre- Assessment Module
Replies: 1
Views: 282

### Question from Photoelectric Effect Pre- Assessment Module

Light hits a sodium metal surface and the velocity of the ejected electron is 6.61 x 105 m.s-1. The work function for sodium is 150.6 kJ.mol-1. Answer the following three questions. A. What is the kinetic energy of the ejected electron? B. How much energy is required to remove an electron from one s...
Fri Jun 30, 2017 1:32 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Fundamentals E.17
Replies: 4
Views: 848

### Fundamentals E.17

The question asks for which sample in the pair contains the greater number of moles: 7.36x10^27 atoms of Ru or 7.36x10^27 atoms of Fe ? I attempted this problem following the basic order of conversion but its off having that since one would multiply by 1 mole and then divide by 6.022X10^23, it gives...