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Chemistry: Post your doubts here!
Q.4: N2+O2--->2NO 180+(-994)+(-494)= 2X X=655 hence A. -
Chemistry: Post your doubts here!
Welcome :) Hope you understand :) -
Chemistry: Post your doubts here!
apart form drawing the Hess's cycle, try using this method: C3H6O+4O2---->3CO2+3H2O Enthalpy change of combustion of propanone is the enthalpy change of reaction. and the enthal of formation of an element is always zero. (-1786)+(Enthalpy of formation of propanone)= (3x enthalpy of combustion of... -
Seems like someone here is excellent in chemistry :)
Seems like someone here is excellent in chemistry :)- Aries_95
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Physics Paper 12
No discussion here before 24 hours...do you want the GT to go higher? -
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Chemistry: Post your doubts here!
Q.11: In Hydrazine, the N-N is a single bond and not a triple bond. Simply because it has a high activation energy ie B. Q.23: The product produced as a result of oxidation produces orange ppt with 2,4 dinitrophenyl hydrazine means that it contains a carbonyl carbon. ie it is either a ketone or... -
Chemistry P1 Challenging Questions Preparation
Yeah...agree with you...they have increased the difficulty level of the papers, keeping in mind Chem Paper 42 (Was the hardest in history probably:rolleyes: )...they will increase the difficulty level of paper one. Tips, notes anyone? I have for organic chemistry. -
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How was Physics/12 paper?
And who are those great minds who found the paper easy?:confused: -
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How was Physics/12 paper?
The most stupid question ever:mad: ...I couldn't understand which formula we had to use...did you? -
How was Physics/12 paper?
The paper was harder than what many of us expected...hope the GT is low this tym..or else we are all busted:( -
Physics Paper 12
How did you guys find the paper? and what do you think will be the GT? -
Chemistry and Physics AS paper 12 MCQS
Yeah. Since we have to calculate the tension in the wire and the wire is sort of divided into two parts. -
Chemistry and Physics AS paper 12 MCQS
For May/June 2010: Q.10: Using the law of conservation of momentum: Before collision= after collision. m(60)+m(-40)=(m+m)v 20m=2mv v=10 cm/s^-1 Hence the answer is A. Nov 10: Q.29: F=qV mg=q(V/d) q=mgd/V Hence the answer is A. -
Chemistry and Physics AS paper 12 MCQS
T=W T sin θ=W 2T sin θ=W T=W/2 sin θ Hence the answer is B. -
Physics: Post your doubts here!
d=10^3/300=3.33m. d sin θ=nλ 3.33 sin 90= (n/2)x (450x10^-9) n=14.8=15 hence D. -
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Physics: Post your doubts here!
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s11_qp_12.pdf Q.17 and 31 anyone?