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i fully effed up my 3u test..lost many marks by wrong set up :mad: totalled 81%....now i need some motivation assistance :speechless:

hey guys i was just wondering what is the main difference between homeostasis and enantiostasis and what is the diff between osmosis and diffusion :tongue:

theres some in the Paul L. Copeland book Volume 2 They're so tank that looking at them gives me a headache :L anyone know any common questions that pop up in 1/2 yearlies?

first step for concentration where did you get 0.1 i did 40g per 1L n[CH3COOH] = 40/60 = 0.66

bump

ZnS + 2HCl -> ZnCl + H2S 50mL of 0.01 M HCL added to 0.11g ZnS A) Which reagent is in excess and by how much B) What volume of H2S is produced at 298K in this experiment A bottle of vinegar was labelled 4% w/v (4g per 100mL) If 0.118 NaOH was titrated with 5mL of the vinegar...

so end point = change in colour? equivalence point = neutral substance? (isn't that change in colour as well) My teacher said equivalence point = theoretical and end point = experimental. Is this true?

thx and what is the diff between equivalence point and end point.

A catalyst (conc. H2SO4) is essential to allow the rxn to take place at low temps. Why low temps?

ah not fair. I had to do the 2u exams as assumed knowledge xP i had 50 mins left in my 4u exam, was kinda short o-o and couldn't do one whole question had to like bs all of it xD

for your one you dont diff it till the very end after you assume n = k you get some integral with x x^k d/dx then you do product rule you will get dx /dx on one side which then cancels out then you only have d / dx on one side diff that side and you will prove n = k +1

yay got this one :D you get dx / dx which cancels out when you product rule never knew that a function can be cancelled out with a value :O

i got both my ones now

then how do you do it exact same thing i was thinking dno how to do the question posted too xD i got both sides equal after i diffed it

help me on this one please this one i really need help on

im sure i wrote it write use k +2 instead at the end i get 12m +6k^2 + 12k + 12 but im not sure if you're allowed to make the 6k^2 into 1/2 k^2 so i have 12 on the outside

Given that Tn = 2T(n-1) +1 and T1 = 5, prove that Tn = 6 x 2^(n-1) - 1

i got one i need help on answer fast please :) you can skip all the steps and just go to prove n = k+1 or 2? For even n prove n^3 + 2n is divisible by 12 advancing of the proof from k to k+2

i only have cambridge book right now :lol:

alrdy did