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This is a question from Exam Choice 08 Trial paper of which i dont have the solutions for. The question is : Which one of the following is an acid/base conjugate pair? (a) HCl/NaOH (b) H_2SO_4/SO_4%5E%7B2-%7D (c) H_3O%5E+/H_2O%5C%5C (d) NH_2%5E-/NH_3 Initially i thought c, but that would...

A question from coroneos that's really annoying me. The question is %5Cint%20%5Cfrac%7Bdx%7D%7B3sinx+4cosx%7D The answer is %5Cfrac%7B1%7D%7B5%7Dln%28%5Cfrac%7B1+2tan%5Cfrac%7Bx%7D%7B2%7D%7D%7B2-tan%5Cfrac%7Bx%7D%7B2%7D%7D%29 But i keep getting...

This question is from 3U cambridge year 12. cos2%5Ctheta%20+%203%20=%203sin2%5Ctheta%5C%5C%20$Hint:%20Wrote%203%20as%203cos%5E2%5Ctheta%20+%203%20sin%5E2%5Ctheta%5C%5C%200%5Cleq%20%5Ctheta%5Cleq%202%5Cpi%5C%5C%20$Solve%20for$%20%5Ctheta$,$%20giving%20solutions%20to%20the%20nearest%20minute$ I...

I'm preparing for an english essay in which we have 40 minutes to write our english essay for an exam. From what i remember, last year i managed roughly 1000 words in a 40-45 minute exam but some of my friends don't believe this and has left me unsure. Just curious, how many words would...

%5C100dpi%20$%20A%20sequence%20is%20such%20that%20$T_%7B1%7D=8,%20T_%7B2%7D=34%20$%20and%20for%20all%20positive%20integers%20n,%20T_%7Bn+2%7D%20=%208T_%7Bn+1%7D-15T_%7Bn%7D$%5C%5C%20$Prove%20by%20mathematical%20induction%20that%20T_%7Bn%7D=3%5En+5%5En$ I've worked it out but theres one step im...

I have absolutely no idea how to do this questions. I always start off with an idea then hit a dead end. If anyone could help it would be greatly appreciated :) P(cp , c/p) is a point on the hyperbola xy=c^2 The normal to the hyperbola at P meets the hyperbola again as Q. Show that the locus...

The area in the first quadrant under y=1 and above y=2-2/x is rotated about the x axis. Find the volume formed. Chapter 12E Q14 Cambridge year 11 3U I keep getting the answer wrong and am not sure if i'm doing it right or not...

For a titration with a strong acid and strong base, the equivalence point will be about a pH of 7 and bromothymol blue is the optimal indicator. My question is, how suitable is methyl red as an indicator for a strong acid strong base titration? My school's bromothymol blue went off and our...

A rocket is travelling to the star closest to earth, proxima centauri which is a distance of 4.3 light years away. The rocket travels at a speed of 0.8c and the time taken to accelerate and decelerate is negligible. Calculate the number of years that will pass as measured by the crew of the...

I've gotten stuck at the end of this and don't know to finish it. The question is $Prove%20by%20mathematical%20induction%20that%20$%28%5Cfrac%7Ba+b%7D%7B2%7D%29%5En%5Cleq%20%5Cfrac%7Ba%5En+b%5En%7D%7B2%7D%20$Where%20$%20A%3E0$%20$%20B%3E0$%20and%20$%20$N$%5Cgeq%201 Skipping step 1 and the...

The question is $P%20$%28a%20cos%5Ctheta,%20bsin%5Ctheta%29$%20and%20Q%20$[a%20cos%20%28%5Ctheta+%20%5Cpi%29,%20bsin%20%28%5Ctheta+%5Cpi%29]$%20lies%20on%20the%20ellipse%20$%20%5Cfrac%7Bx%5E2%7D%7Ba%5E2%7D+%5Cfrac%7By%5E2%7D%20%7Bb%5E2%7D=1%20$%20Show%20that%20PQ%20passes%20through%20%280,0%29$...

In regards to the dot point "Describe how commercial radioisotopes are produced" To what extent of detail is required? So far i have mentioned the use of nuclear reactors and particle accelerators and their production of neutron deficient/rich isotopes, as well as providing examples eg...

What exactly is the equation of the reaction taking place? I was thinking C6H10 + Br2 ---> C6H10Br2 But somewhere else i saw C6H10 + Br2 +H2O ---> C6H10BrOH + BrOH :confused: Also : is the state of bromine water (l) or (aq)? thanks (: