Search found 15 matches

by Xinye_Jiang_1A
Sun Jul 30, 2017 8:27 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Why I3 is linear?
Replies: 2
Views: 1241

Why I3 is linear?

Since the central atom has lone pairs of e-. why it is said in book that I3 is linear?
p.s I know it is not in the final, still i want to know why
by Xinye_Jiang_1A
Sun Jul 30, 2017 8:26 pm
Forum: Lewis Acids & Bases
Topic: Why Ag+ is a Lewis acid not base?
Replies: 1
Views: 2415

Why Ag+ is a Lewis acid not base?

It is said that a e- pair acceptor is a Lewis acid. Why Ag+ accepts e- instead of donate them to form an octet?
by Xinye_Jiang_1A
Sun Jul 23, 2017 9:11 pm
Forum: Dipole Moments
Topic: Polar and Non-polar bond
Replies: 8
Views: 1172

Re: Polar and Non-polar bond

PriscillaMariscal_3F wrote:If there is a linear molecule, and the dipole moments for the two outside atoms are facing towards the central atom, would the molecule be polar or nonpolar?

non polar i think since they cancel.
by Xinye_Jiang_1A
Sun Jul 23, 2017 9:07 pm
Forum: Octet Exceptions
Topic: Exercise 3.59 - Question on Radicals
Replies: 3
Views: 350

Re: Exercise 3.59 - Question on Radicals

Will the unpaired e- always be on the atom with relatively lower electronegativity?
by Xinye_Jiang_1A
Sun Jul 23, 2017 8:59 pm
Forum: Electronegativity
Topic: Which atom would carry the formal charge
Replies: 3
Views: 570

Which atom would carry the formal charge

TA told me the atom that has the highest electronegativity in the anion would carry the negative charge, like the oxygen in IO3- carries the -1 charge. Whys that? How can we determine which atom has the highest electronegativity? Will the info be given?
by Xinye_Jiang_1A
Sun Jul 23, 2017 8:49 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Concentration vs. Pressure?
Replies: 4
Views: 305

Re: Concentration vs. Pressure?

T is given by Kelvin right?
by Xinye_Jiang_1A
Fri Jul 07, 2017 12:52 pm
Forum: Photoelectric Effect
Topic: Why 2 photons removes 2 e- from 2 atoms not 1 atom?
Replies: 2
Views: 284

Re: Why 2 photons removes 2 e- from 2 atoms not 1 atom?

Having asked one TA, I know that 2 photons with enough energy will eject 2 electrons from 2 atoms. Since the book only mentions the 1 photon per 1 e- relationship that 2 photon will interact with 2 electrons if having enough energy, I wonder why those 2 ejected electrons must come from 2 atoms but ...
by Xinye_Jiang_1A
Fri Jul 07, 2017 12:48 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: questions regarding e- configurations
Replies: 3
Views: 375

Re: questions regarding e- configurations

You are right about your inference on question 1. Your second question is a little confusing. When writing Ca and K configurations, d-block doesn't play a role. However, if what you were asking was for the configurations after Ca on the d-block, then you are right except for the configurations for ...
by Xinye_Jiang_1A
Fri Jul 07, 2017 12:43 pm
Forum: Resonance Structures
Topic: Where do the extra valence e- come from in S of SO4 2-
Replies: 2
Views: 1184

Where do the extra valence e- come from in S of SO4 2-

I think Dr Lavelle said in class that the extra 4 valence electrons of sulfur come from the atom's subshell 3d, but the configuration of sulfur atom is 1s2 2s2 2p6 3s2 3p4. So I wonder where those electrons come from, and how can we know the number of valence electrons of sulfur is 10 not 6 in the c...
by Xinye_Jiang_1A
Thu Jul 06, 2017 12:03 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: questions regarding e- configurations
Replies: 3
Views: 375

questions regarding e- configurations

I didn't learn this part of chem in high school so the questions might be a bit stupid :)
1) elements in the third group in periodic table all fill (n-1)d1 then (n)s2 at last?
2) As for K and Ca elements, E 4s < E 3d, for Rb and Sr, E 5s < E 4d, and so on?
by Xinye_Jiang_1A
Thu Jul 06, 2017 11:54 am
Forum: Photoelectric Effect
Topic: Why 2 photons removes 2 e- from 2 atoms not 1 atom?
Replies: 2
Views: 284

Why 2 photons removes 2 e- from 2 atoms not 1 atom?

Having asked one TA, I know that 2 photons with enough energy will eject 2 electrons from 2 atoms. Since the book only mentions the 1 photon per 1 e- relationship that 2 photon will interact with 2 electrons if having enough energy, I wonder why those 2 ejected electrons must come from 2 atoms but n...
by Xinye_Jiang_1A
Fri Jun 30, 2017 7:10 pm
Forum: Empirical & Molecular Formulas
Topic: How can we write the molecular formulas of some organic chemicals?
Replies: 3
Views: 446

Re: How can we write the molecular formulas of some organic chemicals?

Additionally, the order that the respective elements are given in a molecular formula gives insight on the specific formation that the atoms are placed in. Hi Paul, could you talk a little bit more about what you mean by "the specific formation that the atoms are placed in"? I thought the...
by Xinye_Jiang_1A
Fri Jun 30, 2017 7:03 pm
Forum: Properties of Electrons
Topic: Clarification on "ground state"
Replies: 2
Views: 396

Re: Clarification on "ground state"

Well I've learnt this in physics class 3 years ago so I'm not sure I'm right on this, but I think some ground states of e- in atoms might be at N=2,3,etc. It depends on which electron in which atom we're studying at. About "excited", in the case of H atom: "A hydrogen atom with excess...
by Xinye_Jiang_1A
Thu Jun 29, 2017 10:13 am
Forum: Properties of Light
Topic: energy required to remove an electron [ENDORSED]
Replies: 7
Views: 1411

Re: energy required to remove an electron [ENDORSED]

Since the work function is given by J/mol, is it possible that we need to devide 1.506*10^5 by 6.022*20^23 to get the work function for one electron per atom? Hope the image of the worked out problem attached helps. I'll walk through my brain jumble: 1) To solve for the KE of the ejected electron, u...
by Xinye_Jiang_1A
Wed Jun 28, 2017 11:23 pm
Forum: Empirical & Molecular Formulas
Topic: How can we write the molecular formulas of some organic chemicals?
Replies: 3
Views: 446

How can we write the molecular formulas of some organic chemicals?

Without knowing the structures of the organic chemicals, how can we write the molecular formulas correctly? For example, for problem F15, how can I know the formula should be C16H13ClN2O instead of C16H13N2ClO?

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