Search found 29 matches

by yast_27
Fri Dec 07, 2018 5:13 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: polydentate
Replies: 2
Views: 80

polydentate

I just wanted to make sure that i did get this right:

Basically to find out if a compound is polydentate and how many bonds it makes with the central atome (transition metal) we are suppose to count the number of lone pair on this compound and it will give us the # of bound created?
by yast_27
Sun Dec 02, 2018 12:58 pm
Forum: Naming
Topic: re: Bond Length and Resonance
Replies: 2
Views: 60

re: Bond Length and Resonance

Which are the ligands name that we are requiered to know for the final? Are they the one listed in the manual (7th => p724) or will we be given a chart with these common ligands name?
by yast_27
Sun Dec 02, 2018 12:56 pm
Forum: Naming
Topic: alphabetical order/ charge
Replies: 2
Views: 65

alphabetical order/ charge

When we name the ligand part of the compound, should we start by naming the anion in alphabetical order and then name the neutral compound in alphabetical order or should we name all of the ligands in alphabetical order without consider their charge?
by yast_27
Sat Dec 01, 2018 11:54 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentate ligands
Replies: 3
Views: 70

Polydentate ligands

How can we determine if a ligand is polydentate when naming a coordination compound?
by yast_27
Sat Dec 01, 2018 11:53 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination number
Replies: 1
Views: 37

Coordination number

Are polydentate ligand consider as one ligand or the number of bound they form with the TM in the coordination number?
by yast_27
Mon Nov 26, 2018 2:00 pm
Forum: Hybridization
Topic: Lone pair
Replies: 4
Views: 84

Lone pair

Should we consider lone pair as sigma or pi bond when we do hybridization?
For example if an central atom is linked with 3 atoms (sigma bond) and 1lone pair is it s1p3 or s1p2 hybridization?

Thank you very much!
by yast_27
Mon Nov 26, 2018 9:16 am
Forum: Hybridization
Topic: Sigma and pi bond
Replies: 2
Views: 76

Sigma and pi bond

Hi,

I was wondering how we were suppose to work with resonnance structure to determine sigma and pi bond?
Do we count 2pi bond, 2 sigma bond or one of each?

Thank you very much!
by yast_27
Sun Nov 25, 2018 1:08 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal charge vs octet rule
Replies: 5
Views: 274

Formal charge vs octet rule

Hi,

Is it more important to fullfill the octet rule or to have the most stable molecule possible?

Thank you
by yast_27
Sat Nov 24, 2018 8:48 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar/apolar
Replies: 1
Views: 43

Polar/apolar

When you have a molecule such as CH4, is it considered as polar or apolar?
Does the 4H atoms dipole moment around the C atom cancel themselves?

Thank you very much!
by yast_27
Fri Nov 23, 2018 11:57 am
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR RULE 3
Replies: 4
Views: 120

VSEPR RULE 3

Hi,
I don't understand why single and multiple bond are considered the same as they have different electon "concentration", why aren't double bond more repulsive than single bond?

Thank you very much
by yast_27
Sun Nov 11, 2018 7:54 pm
Forum: Bond Lengths & Energies
Topic: Bond Length and Resonance
Replies: 5
Views: 171

Re: Bond Length and Resonance

Hi you should checkout this website (it explains everything really clearly, i usually go there when i'm looking for further info) I'm going to quote the important part of this article for your question: https://chem.libretexts.org/Textbook_Maps/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supple...
by yast_27
Sun Nov 11, 2018 7:45 pm
Forum: Administrative Questions and Class Announcements
Topic: Peer learning session/office hours
Replies: 1
Views: 939

Peer learning session/office hours

Hi,

I was wondering if the peer learning session and office hours are maintain this monday and at the beggining of thanksgiving week?

Thank you!
by yast_27
Sun Nov 11, 2018 7:43 pm
Forum: Administrative Questions and Class Announcements
Topic: Thanksgiving Wednesday
Replies: 9
Views: 303

Re: Thanksgiving Wednesday

If we have a chem discussion that day will it be canceled too? For all of my other classes, the discussions/labs have been canceled because half of the class would miss the discussion hours at the end of the week. I still think that you should email your TA to know about this since for chem the dis...
by yast_27
Sun Nov 04, 2018 11:51 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron configuration when 4s and 3d
Replies: 3
Views: 69

Electron configuration when 4s and 3d

Hi,

I'm still really confused about how we should represent atoms that have either 3d or 4s shell.
Should we fill the 4s first and then then 3d? (4s^2, 3d^10) Or should we fill 3d before 4s? (3d^10,4s^2).

Thank you very much!
by yast_27
Sun Nov 04, 2018 11:41 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Uncertainty principle question
Replies: 2
Views: 242

Uncertainty principle question

Hi!

When a question is asked with "the speed is 345m/s +/- 0.4,
Is the uncertainty in speed 0.4m/s or 0.8m/s?

Thank you very much!
by yast_27
Tue Oct 30, 2018 2:55 pm
Forum: Resonance Structures
Topic: Resonance hybrid
Replies: 2
Views: 82

Resonance hybrid

Hi,

I was wondering if we were supposed to represent the lewis structure differently when there is a resonance.
Are we supposed to reprend each possibility, show the electron movement with arrow or draw half/ third bond (depending on the molecule)

Thank you very much!
by yast_27
Sun Oct 28, 2018 3:21 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 3d and 4d
Replies: 1
Views: 74

3d and 4d

Hi!

I was wondering why "after 4s state orbital occupied and e- enter 3d state, then 3d state is lower in energy than 4s".

Thank you very much!
by yast_27
Sun Oct 28, 2018 3:19 pm
Forum: Trends in The Periodic Table
Topic: E- affinity and electronegativity [ENDORSED]
Replies: 1
Views: 107

E- affinity and electronegativity [ENDORSED]

Hi,

I was wondering what is the link between e- affinity and electronegativity?


Thank you very much!
by yast_27
Sun Oct 28, 2018 3:16 pm
Forum: *Shrodinger Equation
Topic: Shrodinger equation explanation
Replies: 1
Views: 237

Shrodinger equation explanation

Hi, I was wondering if anyone could explain me how we are supposed to use the shrodinger equation? On the syllabus it is written that we are supposed to understand : "the relationship between Schrodinger's equation (H ψ = E ψ), wave functions, and orbitals." Beside the fact that ᴪ^2 repres...
by yast_27
Tue Oct 23, 2018 3:39 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: orbital position
Replies: 2
Views: 131

orbital position

Hi,

I was wondering how we could determine the orbital position along the axis with the ml number.

Thank you very much!
by yast_27
Sat Oct 20, 2018 9:16 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
Replies: 135
Views: 28865

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]

Hi!

I was wondering if we should sign up for the peer session as i wanted to attend you session tomorrow,

Thank you very much!
by yast_27
Sat Oct 20, 2018 9:06 pm
Forum: Properties of Light
Topic: Do I have to memorize the spectrum?
Replies: 20
Views: 393

Re: Do I have to memorize the spectrum?

During my discussion, the TA said that we should have the information required to find the n level. If you have done the A15 exercise in the book though, they says that the wavelenght studied is from the UV spectrum and this should be enought for you to state that it's from the lyman serie with n = 1
by yast_27
Sat Oct 20, 2018 9:01 pm
Forum: Administrative Questions and Class Announcements
Topic: Required knowledge for test/midterm [ENDORSED]
Replies: 13
Views: 333

Re: Required knowledge for test/midterm [ENDORSED]

Im pretty sure this second test will pretty much cover the entire Quantum world unit we've been doing aka the majority if the video modules Pr. Lavelle said that we had to study the content until this friday lecture in class. I meant what are the formula and constants that were required to know. Ac...
by yast_27
Sat Oct 13, 2018 8:19 pm
Forum: Administrative Questions and Class Announcements
Topic: Writing in Pen
Replies: 13
Views: 341

Re: Writing in Pen

Hi,

I asked this question to my TA on friday before TEST1 and she said that it's fine to write with a pencil as long as you can clearly read the answer.
It might depend on the person who correct the paper so i think that you should ask this question before taking the test.

I hope this will help!:)
by yast_27
Sat Oct 13, 2018 8:13 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Exercise A15
Replies: 1
Views: 34

Exercise A15

Hi, I've worked on this exercise but i'm not sure that my way to approach the problem is the correct one. "In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6nm. Determine the values of n for the initial and final energy levels of e- during the emission of energy that le...
by yast_27
Sat Oct 13, 2018 3:04 pm
Forum: Administrative Questions and Class Announcements
Topic: Required knowledge for test/midterm [ENDORSED]
Replies: 13
Views: 333

Required knowledge for test/midterm [ENDORSED]

Hi,

I wanted to know what is the requiered knowledge of formula/value for test on the Quantum chapter.
For example, is it requiered to know:
- the conversion from electrovolt to jouls
- the plank constant
- the mass of an electron
- the speed of light

...

Thank you very much
by yast_27
Sat Oct 06, 2018 9:17 am
Forum: SI Units, Unit Conversions
Topic: How does grading for discussion posts work?
Replies: 80
Views: 2581

Re: How does grading for discussion posts work?

Hi, i am having trouble to post on the forum.
I'm able to respond any post but i don't know how to create an actual question post.
Can anyone help me with that?

Thank you!
by yast_27
Sat Oct 06, 2018 9:08 am
Forum: Molarity, Solutions, Dilutions
Topic: post assessment
Replies: 1
Views: 38

Re: post assessment

This is a dilution problem, typicaly you have to use the following equality: C1.V1 = C2.V2 Here you have: C1 = 0.0380 = 3.80 x 10^-2 V1 = Unknown C2 = 1.50 x 10^-3 V2 = 250mL = 0.25 x 10^-3L You have 1 value that is unknown so you just transform the equality so that you end up with V1 = (C2.V2)/C1 a...
by yast_27
Sat Oct 06, 2018 9:02 am
Forum: Empirical & Molecular Formulas
Topic: Question L.39, Reaction Stoichiometry
Replies: 1
Views: 58

Re: Question L.39, Reaction Stoichiometry

In this problem, you want to figure out the ratio (the empirical formula) between quantity (in mole) of Oxygen (O) and tin (Sn) in the oxide of tin. The step for this kind of problem are the following: - calculate the mass of each component: m (Sn) = 1.50g m (O) = 28.35g - (26.45 + 1.50 = 27.95 => m...

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