The answers to the Inorganic Quiz MCQ are:
CBAC BDAC ADDB BDBC CBDD BD
Tuesday, August 28, 2007
Errata for Inorganic MCQ Quiz Q12
Take note that for Q12 (Inorganic MCQ Quiz), please change chlorine to bromine.
Thursday, August 23, 2007
Erratum: Physical Chemistry MCQ Practice 2
Dear Students,
Please note that the answer for Q12 of Practice 2 is B, not C.
The explanation given in the suggested solutions is correct.
Please note that the answer for Q12 of Practice 2 is B, not C.
The explanation given in the suggested solutions is correct.
Tuesday, August 21, 2007
Reminders
H2 Chemistry
Chemistry Lecture Test 7B (Thu, 23/8)
Topic: Organic Nitrogen Compounds (Biochem component)
Chemistry Remedial Test (Fri, 24/8)
Topic: Organic Chemistry
Time: 3.15 pm
Venues: LT3 for SO3 + SO7 and LT6 for SO6
H3 Chemistry
Please print the suggested solutions on your own at the photocopying shop.
Chemistry Lecture Test 7B (Thu, 23/8)
Topic: Organic Nitrogen Compounds (Biochem component)
Chemistry Remedial Test (Fri, 24/8)
Topic: Organic Chemistry
Time: 3.15 pm
Venues: LT3 for SO3 + SO7 and LT6 for SO6
H3 Chemistry
Please print the suggested solutions on your own at the photocopying shop.
Sunday, August 19, 2007
Thursday, August 9, 2007
Just a small note to the answer for H3 tutorial qns on NMR
This is another FAQ. Many students ask, are the two protons on the =CH2 of the terminal alkene equivalent or not?
The answer is, it depends.
1) if the two groups on the other carbon are not the same, then the two protons are non equivalent. eg CH3CH=CH2. the two protons on CH2 are not equivalent
2) if the two grops on the other carbon are the same, then there is symmetry and the two protons are equivalent.
eg. (CH3)2C=CH2.
this is the case for one of the tutorial qns
3) sometimes the NMR spectrometer has a poor resolution and cannot differentiate the slight difference in the two protons in the =CH2 group. This is the case for some of the spectra you get to read!
so lets say for CH3CH=CH2, if you were to asked predict, you should predict 4 signals. a doublet of intensity 3 from CH3, a multiplet of intensity 1 from the CH, and another 2 doublets each of intensity 1 from the two CH2 protons(ie one doublet from each proton)
but when you read from the spectrum, you may possibly get the two CH2 protons giving the same signal, ie a doublet with intensity 2. so thats a total of only 3 signals.
you get the drift right?
The answer is, it depends.
1) if the two groups on the other carbon are not the same, then the two protons are non equivalent. eg CH3CH=CH2. the two protons on CH2 are not equivalent
2) if the two grops on the other carbon are the same, then there is symmetry and the two protons are equivalent.
eg. (CH3)2C=CH2.
this is the case for one of the tutorial qns
3) sometimes the NMR spectrometer has a poor resolution and cannot differentiate the slight difference in the two protons in the =CH2 group. This is the case for some of the spectra you get to read!
so lets say for CH3CH=CH2, if you were to asked predict, you should predict 4 signals. a doublet of intensity 3 from CH3, a multiplet of intensity 1 from the CH, and another 2 doublets each of intensity 1 from the two CH2 protons(ie one doublet from each proton)
but when you read from the spectrum, you may possibly get the two CH2 protons giving the same signal, ie a doublet with intensity 2. so thats a total of only 3 signals.
you get the drift right?
Tuesday, August 7, 2007
Term 3 Week 8
Dear students, hope that you're having a good and restful, yet productive break:)
Just wanna remind u about Inorganic Chemistry lecture on Tuesday. You should complete your Inorganic Chemistry worksheet prior to the session!
On Thursday we will have an Inorganic Chemistry lecture test. Do prepare well for it!:)
S&U students will be taking the Equilibria Remedial test on Friday. It will be at 3.15pm, LT3 for S03s, LT6 for SO6!
Happy National Day!
Just wanna remind u about Inorganic Chemistry lecture on Tuesday. You should complete your Inorganic Chemistry worksheet prior to the session!
On Thursday we will have an Inorganic Chemistry lecture test. Do prepare well for it!:)
S&U students will be taking the Equilibria Remedial test on Friday. It will be at 3.15pm, LT3 for S03s, LT6 for SO6!
Happy National Day!
Wednesday, August 1, 2007
Naming Transition Metal Complexes + Errata in Physical Chem Revision Part 2
Naming Transition Metal Complexes (Lecture Notes 23, p15, Q5)
(a) hexaaquanitrosyliron(II) ion; tris(ethane-1,2-diamine)cobalt(III) ion; tetraamminecopper(II) chloride (this is a salt); tetracarbonylnickel(0); tetrachlorocuprate(I) ion; hexacyanoferrate(III) ion
(b) [Co(NH3)5(NO2)]Cl2; K3[Fe(CN)5(NO)]; [Pt(NH3)4][PtCl4]
Errata in Physical Chemistry Revision Part 2:
For Q1, please note that the labels for the graphs are missing. For the first portion, the curve on top is for chlorine while the one in the middle is for sulphur dioxide. At the end of the reaction, the curve on top is for sulphur dioxide and the one in the middle is for chlorine. The one at the bottom is for the product.
(a) hexaaquanitrosyliron(II) ion; tris(ethane-1,2-diamine)cobalt(III) ion; tetraamminecopper(II) chloride (this is a salt); tetracarbonylnickel(0); tetrachlorocuprate(I) ion; hexacyanoferrate(III) ion
(b) [Co(NH3)5(NO2)]Cl2; K3[Fe(CN)5(NO)]; [Pt(NH3)4][PtCl4]
Errata in Physical Chemistry Revision Part 2:
For Q1, please note that the labels for the graphs are missing. For the first portion, the curve on top is for chlorine while the one in the middle is for sulphur dioxide. At the end of the reaction, the curve on top is for sulphur dioxide and the one in the middle is for chlorine. The one at the bottom is for the product.
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