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Chemistry: Post your doubts here!
Q Q6 was left so ; P1V1 + P2V2 = PtVt Pt , Vt= total pressure and volume 1/1000 *2000 + 2/1000 + 1000 = Pt * 3/1000 Ans = A 1 1/3 -
Chemistry: Post your doubts here!
P3 is the final pressure and P2 is the answer I got before. I just set up a variables. The real formula is p1V1/T1 = p2V2/T2 Mstudent says that this gives a correct answer too but I couldn't get one so, I did P1V1 = P2V2 1st and then P2/T1 = P3/T2 (T2 being the new temperature) It... -
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Chemistry: Post your doubts here!
https://papers.gceguide.com/A Levels/Chemistry (9701)/9701_w16_qp_12.pdf In Q 26 how is the answer C and not B? Doesn't B make more sense? Q 30 Arent both all 4 the same? Q 35 I dont understand the % decrease in mass statement (2) -
Chemistry: Post your doubts here!
https://papers.gceguide.com/A%20Levels/Chemistry%20(9701)/9701_w16_qp_12.pdf Q20 why isn't the answer D? -
Chemistry: Post your doubts here!
https://papers.gceguide.com/A%20Levels/Chemistry%20(9701)/9701_w16_qp_12.pdf Q15 Shouldnt the answer to this be D? Cl +7 O -8 overall -1 ?? -
Chemistry: Post your doubts here!
https://papers.gceguide.com/A%20Levels/Chemistry%20(9701)/9701_w16_qp_12.pdf Q11 -
Chemistry: Post your doubts here!
A is the answer as H + and Cl + and O 2- (overall 0 so this is correct ) Mg +2 OH - (wrong) Na + So4 -2 (wrong) NH4+ Cl - (wrong) -
Physics: Post your doubts here!
Areas under the graph (5-0.8)*20/2 + 0.8*20 -
Physics: Post your doubts here!
O Only Ans A is correct as if wind blows, the aeroplane will move in the same direction as wind ( accelerate in that direction) and the velocity in wind will have a lower magnitude that without wind effect. -
Physics: Post your doubts here!
Loss in Potential Energy + work done by frictional force = Gain in Kinetic Energy mgh + 400*250 = 0.5 *500*v^2 (500 *9.81 *100000)/250 = v^2 sqrt (ans) = 13.87 Ans = A -
Physics: Post your doubts here!
Q13 F1d1 + F2d2 =Ftdt 16000*0.6 +9000*2.1 =(16000+9000)* 28500÷2500=s d=1.14m Q10. velocity upwards = +ve Total momentum before = 0 After = 0 100*-8 + 50 *v1sin60 + 50*v2sin60 = 0 800 = v1 sin 60 + vs sin60 (800/50)/sin60 = v1 + v2 v1 + v2 = 18.4752 (v1 and v2 have equal... -
Chemistry: Post your doubts here!
volume of M = V volume of N = 3 V. Total volume = 4V. P1V1=P2V2. (1 x 10^5)(V)=P2(4V) P2 = 25000 Pa Change in temp ; 20 to 100 degree Celsius. New pressure P2/T1=P3/T2. 25000/293=P3/373 Hence, P3 is 3.18 x 10^4 Pa. -
Chemistry: Post your doubts here!
N2(g) + 3H2(g) 2NH3(g) N2 = 7.2g/6dm3 = 1.2 mol/dm3 H2 = 12g/6dm3 = 2 mol/dm3 Kc= (NH3)^2/((H2)^3*(N2)) 6*10^-2= x^2/ (2^3* 1.2) x=0758=0.76 which is B -
Physics: Post your doubts here!
Did you solve Q14, march 2017 ? Do Post it. -
Physics: Post your doubts here!
Q13 F1d1 + F2d2 =Ftdt 16000*0.6 +9000*2.1 =(16000+9000)* 28500÷2500=s d=1.14m -
Physics: Post your doubts here!
You get diameter 4.81mm so for radius d/2 and convet mm to m. In m 4.81/2/1000 Next u find the volume using 4/3pi r^3 Density =mass(kg)/volume(m^3) Convert g to kg 0.450/1000 ÷vol and you get C as the answer. -
Physics: Post your doubts here!
Your right, and this is March 2017. -
Chemistry: Post your doubts here!
Does anyone have complete ORGANIC notes I lost mine :( I (need them for the MCQ exam because I forgot most of the reactions and important points) I will be really grateful if someone shares their...