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trigonal planor means obviously 3 pairs in central atom, here there are 2 bond pairs (1 single bond and next double bond) another one is lone pair.....the expected angle is 120 and there will certainly be effect of lone pair but it won't affect too much that its angle decreases to 109 there won't be such vast deflection....Cant it be B as trigonal planar(120) means 3 bonding pair hence there are 2 bonding and a lone pair which dec the anlgle a bit so it shld be around 109??/?
11 In which change would only van der Waals’ forces have to be overcome?
A evaporation of ethanol C2H5OH(l) → C2H5OH(g)
B melting of ice H2O(s) → H2O(l)
C melting of solid carbon dioxide CO2(s) → CO2(l)
D solidification of butane C4H10(l) → C4H10(s)
Ans C
Why is it not D?
Butane is also non polar, in addition to CO2
How many structural and cis-trans isomers are there for dichloropropene, C3H4Cl2 ?
A 3
B 5
C 6
D 7
The answer is D! Can anyone draw all the 7, please ?
How many alcohols (including both structural isomers and stereoisomers) can have the molecular
formula C4H10O?
A 3 B 4 C 5 D 6
The answer is C can anyone draw and show ?
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w04_qp_1.pdf
Q-3,10,19,23,31
Help would be appreciated =D
Its B bcoz u hv 2 see the greatest dipole moment.Question 5 on that page:
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w09_qp_11.pdf
Why isnt the answer C or A?
guys guys guysssss...is Cambridge acting crazy or what??
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w05_qp_1.pdf
question 17 in nov/05 P1 is an A2 level..how come they ask us this and we r not even suppose to study it for an AS exam?
can somone explain plssss.. :/
Dont worry. Cambridge would never give anything thats not in or related to our syllabus.
As you might know that the syllabus keeps changing regularly.
This is a very old paper. maybe at that time this topic might have been included in the AS syllabus but as you say it is not included in ours now.
So i guess you dont really need to know abt it.
Yes it is not in our syllabus. Ligands is in the A2 course not AS.phewwww if u r sure of what u r saying then u really made me feel so much better
have a look at the question and correct me if i am wrong ( that it is not in the syllabus 12 )
thanks..
Dude don't mislead people.Dont worry. Cambridge would never give anything thats not in or related to our syllabus.
As you might know that the syllabus keeps changing regularly.
This is a very old paper. maybe at that time this topic might have been included in the AS syllabus but as you say it is not included in ours now.
So i guess you dont really need to know abt it.
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w07_qp_1.pdf
Q32 how can statements 2 and 3 be correct.
Q9
Dude solve my questions tooQ32
Statement 1 - Obviously disagrees with the sentence 'Carbon monoxide burns readily in oxygen to form Carbon dioxide'
Statement 2 - More negative means exothermic reaction (which is easy to occur), so it fits with the sentence
Statement 3 - Kc = [product] / [reactant], if this is high means there is high concentration of CO2 produced. Hence it fits.
Q9
Answer is A. In the equation they've given : SO3 --> SO4. The oxidation number of Sulphur increased from +4 to +6 (change is +2). So, for the metal, there should have been the same magnitude of change but in the negative direction. (Change = -2) So, because it is +3, it would become +1.
Q9 answer is b and concentration doesn't affect Kc only temperature doesQ32
Statement 1 - Obviously disagrees with the sentence 'Carbon monoxide burns readily in oxygen to form Carbon dioxide'
Statement 2 - More negative means exothermic reaction (which is easy to occur), so it fits with the sentence
Statement 3 - Kc = [product] / [reactant], if this is high means there is high concentration of CO2 produced. Hence it fits.
Q9
Answer is A. In the equation they've given : SO3 --> SO4. The oxidation number of Sulphur increased from +4 to +6 (change is +2). So, for the metal, there should have been the same magnitude of change but in the negative direction. (Change = -2) So, because it is +3, it would become +1.
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