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Mathematics: Post your doubts here!
here you go! (i) divide that thingy into 2 triangles from the middle and u will have triangle AOX with angle 1/6pi.. so AX= 12tan1/6pi = 4√3 (ii) to get the area of the shaded region we need to find the area of the sector then subtract it from the whole thingy which is the 2 triangles..area... -
hey i have found some complex pictures which has notes on it. if u have an email i can send u an...
hey i have found some complex pictures which has notes on it. if u have an email i can send u an attachment if u wish.- iKhaled
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Chemistry: Post your doubts here!
for part b (iv) at the cathode: Pb2+ + 2e (equilibrium arrow) Pb E= -0.13V at the anode: PBO2 + 4H+ +2e (equilibrium arrow) Pb2+ + 2H2O E= 1.47V E of the cell = 1.47 - (-0.13) now decreasing the Pb+2 concentration on the cathode will shift the equilibrium to the left which will make E of... -
Chemistry: Post your doubts here!
question 5 part iii. 2H2O + 2e (EQUILIBRIUM ARROW) H2 + 2OH- E = -0.83V (left electrode) 2O2 + 2H2O + 4e (EQUILIBRIUM ARROW) 4OH- E= 0.40V (right electrode) now E= 0.40 - (-0.83) v now when we increase the OH concentration on the left electrode, the equilibrium position will shift to the... -
Chemistry: Post your doubts here!
yeah it is much more clearer now! -
Chemistry: Post your doubts here!
i say it will decrease the voltage because the equilibrium position will shift to the left. -
Chemistry: Post your doubts here!
more positive??? why the equilibrium position will shift to the left which means the value will be less positive so it will decrease -
Mathematics: Post your doubts here!
2nd worst chapter after vectors :( i hate them -
Mathematics: Post your doubts here!
you should know that tan θ = y/x and the gradient (m) is equal to y/x so u can say from here that tan θ = gradient. you need to find the angle between line l and the gradient of the curve at p so first of all we will find the gradient of the curve at point p y = 12x^-1 dy/dx = -12x^-2 dy/dx =... -
Mathematics: Post your doubts here!
cos 4θ - 4cos 2θ + 3 = 8sin^4 θ cos 4θ = 1-2sin^2 2θ cos 2θ = 1-2sin^2 θ 1-2sin^2 2θ -4(1-2sin^2 θ) + 3 1-2(sin 2θ x sin 2θ) -4(1-2sin^2 θ) + 3 sin 2θ = 2sinθcosθ 1-2(2sinθcosθ x 2sinθcosθ) -4(1-2sin^2 θ) +3 1-8sin^2 θ cos^2 θ -4 +8sin^2 θ +3 -8sin^2 θ cos^2 θ + 8sin^2 θ -8sin^2 θ(cos^2... -
Chemistry: Post your doubts here!
lets say that at equilibrium CO2 and H2 will both lose "x" amount of moles which means that CO and H2O will gain x amount of moles so kc will be kc = [H2O][CO]/[CO2][H2] it is given that kc is 1.44 so 1.44 = (0.2+x)(0.2+x)/(0.5-x)(0.5-x) 1.44(0.5-x)^2 = (0.2+x)^2 find x then use it to... -
Mathematics: Post your doubts here!
no problem. if u have anymore questions pls do ask and i will do my best to help! -
Chemistry: Post your doubts here!
paper? and the no of the question too... -
Mathematics: Post your doubts here!
okay the way i did this question is i used two equations then i used simultaneous equations the equations i thought of and guessed they would help me are v = u +at and s = ut+1/2at^2....lets apply these equations to the motion through AB and BC AB: V = u+at which is V= u+5a we also have 55=... -
Chemistry: Post your doubts here!
no problem ask me whenever u want and i will do my best to help you get the answers of ur questions ! -
Chemistry: Post your doubts here!
what's wrong with that? it doesn't matter and it can't react with the alcohol because they r both alcohols..compounds like these r called 'hyrdoxy' so this one will be called 2-hyrdoxy methyl propanoate (i guess thats the correct name) but alll what i want to tell u that it doesn't matter since... -
Chemistry: Post your doubts here!
Q24 the answer will be B because see.. CH3CHO + HCN -----> CH3H(OH)CN CH3CH(OH)CN + dil. H2SO4 ----> CH3CHCOOH (hydrolysis of nitriles forms acid) acid + alcohol will give u an ester so CH3CH(OH)COOH + CH3OH ----> CH3CH(OH)CO2CH3 so the answer is B did u get it ? -
Mathematics: Post your doubts here!
ik man but i mean which paper which year cuz i solved it but i don't wanna give u wrong answers so i need to make sure what i made is right first.. -
Mathematics: Post your doubts here!
what question paper is this?!!