• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

Chemistry P31

Messages
381
Reaction score
140
Points
53
I wrote that too :p r u sure abt it? :/
dont want u to feel bad but it is wrong actually it is because it provides more ions,ions speed up the reaction, u cant say it acts as a catalyst because the ions are changed by the reaction, and the definition of a catalyst is a substance that speeds up a reaction without being changed by the reaction. :D
 
Messages
172
Reaction score
115
Points
53
The reagent that converts alcohol to carboxylic acid.. I wrote potassium dichromate but i forgot to say ACIDIFIED potassium dichromate.. I will get it wrong right?
 
Messages
230
Reaction score
39
Points
38
The reagent that converts alcohol to carboxylic acid.. I wrote potassium dichromate but i forgot to say ACIDIFIED potassium dichromate.. I will get it wrong right?
I wrote acidified then deleted it by the end of the time :confused:
 
Messages
62
Reaction score
24
Points
18
1 thing that I don't got HOW COME 200? 40+80+60=180? 20 marks 4 what?
 
Messages
946
Reaction score
1,144
Points
153
Yeah ,They do it in that way ,like If u get 150 out of 160 which is total for all ,they will divide 150/160 than multiply by 200 to get mark out of 200 ,this actually imrpoves ur grade
 
Messages
230
Reaction score
39
Points
38
paper 3 is 80 as far i know !
please understand what I am saying
paper 6 is 20% only of the mark (I know it is 60 marks in the paper but it worth 40 marks out of 200 only)
paper 1 is 30% ( It is 40 in the paper but worth 60 marks out of 200)
paper 3 is 50% (it is 80 marks in the paper but worth 100 marks out of 200)
if you got for example 45/60 in paper 6 , 60/80 in paper 3 , 36/40 in paper 1 then it is calculated like this
45*40/60=30 marks
60*100/80=75 marks
36*60/40=54 marks
then the total is 30+75+54=159 out of 200
equal 80% approximately
Hope you understood this time
 
Messages
671
Reaction score
457
Points
73
Salt acts as a catalyst & speeds up the rusting process!

dont want u to feel bad but it is wrong actually it is because it provides more ions,ions speed up the reaction, u cant say it acts as a catalyst because the ions are changed by the reaction, and the definition of a catalyst is a substance that speeds up a reaction without being changed by the reaction. :D
salt as a catalyst is right Woot woot! :D
source: http://www.rustblock.com/rust-process-defined.html
 
Top