pigley

Please explain.

Thanks in advance! :D

CyH+ [red] <--> Cy [purple] + H+

Ka for the above equation is 5.00 x 10^ -5

CyH+ + SO2 + H2O <--> CySO3H2 + H+

when SO2 is added to the fruit juice buffered at pH=3.0 to give an equilibrium concentration, [SO2], of 1.0 x 10^ -2 mol dm^ -3, the intensity of the red colour decreases to one tenth of its original value. [ratio of the red to the purple form in a fruit juice buffered at pH=3.0 is 20:1]

write an expression for the equilibrium constant for the reaction and use the above data to calculate its value.

thanks!!

250cm^3 of 0.10 mol dm^-3 NaOH is mixed with 250cm^3 of 0.20 mol dm^-3 HCl. What is the pH of the resulting solution? Please show all workings.

thankyou(:

Thanks in advance! :D

regarding the electron transport chain, why must the electrons be passed along a series of electron carriers of decreasing energy levels?

integrate cot^2 (3x) wrt x

please show all working! (: thanks

What happens to the host cell genome when the influenza virus replicates?

thanks! :D

for transcription, there will be a template strand and a non template strand on the DNA, hence a promoter orients the RNA polymerase into the right direction and the right strand. so that the protein formed would be the right one. am i right up to this point?

my question is what happens to the non template strand? does it has no function at all except that it helps to stabilize the DNA molecule by base pairing?

please reply asap, THANKS :D

your country is at war (touch wood!), and you are to escape with only one item in hand. what would it be? why?

who are the people involved in making the clean and green week in Singapore?

I need the names of these people but I just can't find it ):

thanks! (:

If Ur= 3^(r-1) +2r,

find the sum of the series.

please show your workings, thanks!

p.s I tried doing it but I cant seem to get the answer, because I can only do it if it was to be done with the method of differences. :x

can someone tell me the difference between the trajectory of a ball with AND without air resistance? okay i know the range and max height of the one with air resistance would be shorter but i dont know why! pls EXPLAIN (try to put it as simple as possible :/)! thanks :D

Think of a 5-digit no. (e.g. 12345)

rearrange it to get another number (e.g. 54321)

in which the difference of both numbers must be divisible by 9.

hence, prove that this is always true for any n-digit numbers..

Find the remainder when the integer 1x3x5x7x....x2003x2005 is divided by 1000

Mitosis and meiosis both involve division of the nucleus, containing pairs of chromosomes, and the distribution of the chromosomes to daughter nuclei. The daughter nuclei contain one chromosome from each original pair of chromosomes in _____________.

A) mitosis but not meiosis.

B) meiosis but not mitosis.

C) both mitosis and meiosis.

D) neither mitosis nor meiosis.

thanks! :D

thanks (:

differentiate x³ ln x with respect to x and hence find ∫ x² ln x dx. show all steps clearly. thks!(:

evaluate ³√(2-√5)+³√(2+√5)

action of metal Y on iron(II) sulphate: iron is deposited and a gas is evolved.

what is metal Y and the gas evolved?

thanks in advance(: