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Q#15, 18, 22, 27, 37 & 40
http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_w03_qp_1.pdf
http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_w03_qp_1.pdf
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q# 3, 9, 10, 23,28 & 32
http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_w04_qp_1.pdf
1 In which species does the underlined atom have an incomplete outer shell?
ABF3 CH3
– C F2O D H3O
M/J 2012 - 11
why is it A ,,,,I marked CH3 ?!
question 1 and 2 plsssss
Q3-
1 mole CH3SH reacts with 3 mole O2. So 10 cm^3 of CH3SH reacted with 30cm^3 of O2. (30 cm^3 was excess). It formed CO2 and SO2 gasses, which are also 10cm^3. The answer must be 30+10+10= 50cm^3 which is (C).
Q9-
(A) is alcohol
(B) is alkane
(C) is acid
(D) is ketone.
Only A and B would combust. A is liquid and B is a gas. B should react explosively.
Q10-
This is very simple. Atm is 1.0 and 1 Atm is 1.1, only D has total pressure of 1.1 so obviously D.
Q23-
List out the products. Isomers of C2H4Br2, isomers of C2H5Br, H2 and HBr.
5 Isomers of C2H4Br2, 2 isomers of C2H5Br are possible so answer is 5+2+2 = 9. (D)
Q28-
A will give 1
B will give 2
C will give 1
D will give 1
So answer is (B).
Q32-
This is very simple! The answer is (C) because a low temperature of 450 is used since the reaction is exothermic. The yield is about 14% and Pressure is between 100-300.
In a car engine pollutant oxide Y, which contains non-metallic element X, is formed.
Further oxidation of Y to Z occurs in the atmosphere. In this further oxidation, 1 mol of Y reacts
with 0.5mol of gaseous oxygen.
X could be either nitrogen or sulfur.
Which statements about X, Y and Z can be correct?
1 The oxidation number of X increases by two from Y to Z.
2 Y may have an unpaired electron in its molecule.
3 Y is a polar molecule.
How do u find the ans???
As he has stated non metal is X so when it react with .5 mole of oxygen to balance its -2 oxidation its oxidation no will increase by 2.secondly it say it may have unpaired electron in form of Y so does have N in NO. Thirdly if Y is SO2 then it is polar because of difference in bond polarity in it they are not cancelled because molecule is bent
In a car engine pollutant oxide Y, which contains non-metallic element X, is formed.
Further oxidation of Y to Z occurs in the atmosphere. In this further oxidation, 1 mol of Y reacts
with 0.5mol of gaseous oxygen.
X could be either nitrogen or sulfur.
Which statements about X, Y and Z can be correct?
1 The oxidation number of X increases by two from Y to Z.
2 Y may have an unpaired electron in its molecule.
3 Y is a polar molecule.
How do u find the ans???
yeah sorry it does react and an O is attached to both ends of the double bond! my badb
Bro will acidic KMnO4 react with alkene?
An organic compound, X, will react with an excess of calcium metal to produce a salt with the
empirical formula CaC4H6O4.
What could be the identity of X?
1 ethanoic acid
2 butanedioic acid
3 methylpropanedioic acid
what is the ans? and how do we solve dis?
on 10 paper 12
8,13,14
Q8-
-1565 is the energy required to get Ca2+ (aq) ions.
+177 is the energy required to change Ca solid to gas.
In the original equation we see that Ca solid is changed to Ca2+ (aq).
For this,
-1565 +177 + 590 + 1150 = +352 [590 is the first ionization energy and 1150 is the second ionization energy.]
Answer is (D).
Q13-
This is simple balancing.
m=5
n=2
p=1
q=5
(B)
Q14-
First we find the moles of Calcium Nitrate.
Ca(NO3)2 Mr= 161.4g
Moles of salt= 4.1/161.4 = 0.0254 moles
Thermal decomposition of Ca(NO3)2 gives CaO + 2 NO + o.5 O2 [YOU MUST LEARN THIS EQUATION. I'VE SEEN THIS IN MANY PAPERS. FREQUENTLY REPEATED.]
NO and O2 are gases, they will fly off leaving solid CaO. We need to find it's mass which is moles x Mr.
0.0254 x 56.1 = 1.4249g
Answer is (C) 1.40 g.
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