Search found 13 matches

by Loo Kah Eng 4H
Mon Nov 03, 2014 11:16 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Radical (single electron) = region of e- density?
Replies: 2
Views: 719

Radical (single electron) = region of e- density?

Hi guys, For CH3+, it seems that the configuration is trigonal planar (from this post: https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=38&t=1200"onclick="window.open(this.href);return false;) So does that mean that the single radical electron of C is not considered a region of electron densi...
by Loo Kah Eng 4H
Mon Nov 03, 2014 11:52 am
Forum: Lewis Structures
Topic: Mistake in solutions for Textbook 2.61(d)
Replies: 1
Views: 389

Mistake in solutions for Textbook 2.61(d)

Hi guys, I was trying out the homework and we were asked to draw the Lewis structure for TeCl4 and give the number of electrons around the central atom. The solution given states that there are 10 e- which I believe is correct, but since Te has 6 valence e-, the drawing of the lewis structure should...
by Loo Kah Eng 4H
Mon Nov 03, 2014 11:49 am
Forum: Lewis Structures
Topic: Deciding on the Lewis structure
Replies: 2
Views: 464

Re: Deciding on the Lewis structure

Thank you!
by Loo Kah Eng 4H
Mon Nov 03, 2014 12:50 am
Forum: Lewis Structures
Topic: Deciding on the Lewis structure
Replies: 2
Views: 464

Deciding on the Lewis structure

Hi guys, I was attempting this homework question which just asks us to draw the Lewis structure for CO and determine the formal charge on each of the atoms. I solved it as :C=Ö: Formal charge on C = 4-(2+4/2) = 0 Formal charge on O = 6-(4+4/2) = 0 However, in the solutions given, the answer was :C≡O...
by Loo Kah Eng 4H
Mon Nov 03, 2014 12:41 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Bond Length
Replies: 1
Views: 364

Re: Bond Length

There is no trend for bond length between two atoms. The bond length between two atoms is dependent on the size of each of the atoms (a.k.a their individual atomic radius). The atomic radius has a trend though - decreases across the period and increases down the group.
by Loo Kah Eng 4H
Mon Nov 03, 2014 12:39 am
Forum: Lewis Structures
Topic: Chapter 2 #45
Replies: 1
Views: 387

Re: Chapter 2 #45

I agree with you^, I also encountered that same problem.
by Loo Kah Eng 4H
Sat Nov 01, 2014 9:28 pm
Forum: Lewis Structures
Topic: Telling valence electrons from electron configuration?
Replies: 2
Views: 639

Re: Telling valence electrons from electron configuration?

You are right to state that nickel has 10 valence electrons and yes, it is due to its expandable octet (availability of d orbitals). The maximum number of 8 electrons for octet structure will only apply to elements in the first to second row of periodic table as these elements do not have d orbitals...
by Loo Kah Eng 4H
Wed Oct 22, 2014 8:34 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Valence Electrons
Replies: 3
Views: 7169

Re: Valence Electrons

It seems that the previous student might also be correct, some additional reading on scandium here.

http://environmentalchemistry.com/yogi/periodic/Sc.html
by Loo Kah Eng 4H
Wed Oct 22, 2014 3:12 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Valence Electrons
Replies: 3
Views: 7169

Re: Valence Electrons

Shells n=3 and n=4 are different shells. n=4 is the outermost shell, therefore there are 2 valence electrons. However, in the case that you have 4s2 4p3, this means that you have 5 valence electrons, because in the n=4 outermost shell, you have 2+3 electrons from the s and p subshells. :) *Update: T...
by Loo Kah Eng 4H
Thu Oct 16, 2014 12:48 pm
Forum: Properties of Electrons
Topic: Quantum Numbers
Replies: 2
Views: 580

Re: Quantum Numbers

Hi Martha,

This is a link to my answer. I typed it on word document so that I could format the answer more clearly.
Hope it helps!

http://i59.tinypic.com/fvihwj.jpg
by Loo Kah Eng 4H
Thu Oct 16, 2014 12:20 pm
Forum: Empirical & Molecular Formulas
Topic: Formula for calcium hydroxide vs Sodium hydroxide
Replies: 2
Views: 1800

Re: Formula for calcium hydroxide vs Sodium hydroxide

Hi Ally,

I typed the answer on a word document and here's the link to an image of it. Cheers!

http://i61.tinypic.com/2zoktn7.jpg
by Loo Kah Eng 4H
Thu Oct 09, 2014 12:56 pm
Forum: Limiting Reactant Calculations
Topic: Quiz 1 Prep Fall 2012 Q3
Replies: 3
Views: 7765

Re: Quiz 1 Prep Fall 2012 Q3

@Chem Mod Without calculating the products formed, I can already tell the limiting reagent by the mole ratio of the two reactants, isn't it? Since I know that they react in a 2:1 ratio (NO:O2), then if I have insufficient moles of NO to react with the no. of moles of O2 that I have, then NO is autom...
by Loo Kah Eng 4H
Tue Oct 07, 2014 10:23 pm
Forum: Limiting Reactant Calculations
Topic: Quiz 1 Prep Fall 2012 Q3
Replies: 3
Views: 7765

Quiz 1 Prep Fall 2012 Q3

Question in the paper: Nitric oxide (NO) reacts with O2 gas to form nitrogen dioxide (NO2), write the equation for this reaction. You are given 0.886 mol NO and it is mixed with 0.503 mol O2. Which of the reactants is the limiting reagent? Give the grams of NO2 that were produced. Answer given: Bala...

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