Biology paper 6 tips ^_^

[haochen]

use anhydrous copper sulphate and if water is present it changes from white to blue. (remember to use anhydrous(no water))
or
use cobalt chloride and if water is present it changes from blue to pink. (opposite of the previous one)

hope it helped

ooh th alot yup u rly helped i thoughy there is another test we use in bio or so

glad i helped

a little doubt here
which values for volumes to take like how much in a test tube n how many drops of iodine..cuz in mark scheme they don't accept answers like few or the same volume or number :/

oh and what is a buffer and a colorimeters?
^_^"

iodine take 3 drop and use value not word thats why they dont accept wording.
and colorimeters is an apparatus or rather a set of apparatus which is used to measure the rate of transpiration.
u can find the diagram on june 1999 question 2 (i got the hard copy but i think there is on net)

hope i helped
gud luck n ur exam