Qualification > Sciences

ALL CIE CHEMISTRY DOUBTS HERE !!

<< < (103/142) > >>

Master_Key:

--- Quote from: EMO123 on May 06, 2011, 03:21:35 pm ---master_key
2,4-dinitrophenaylhydrazine also reacts with ketones to give a deep yellpw pr orange precipitate

there fore
y is a aldehyde
so there is only one aldehyde not ketone also present in that combination

:. D is the right answer

hope i helped

--- End quote ---

There are no ketone groups in that question so i mentioned "Aldehyde".
2,4-dnph reacts with Carbonyl compounds.

EMO123:

--- Quote from: Master_Key on May 07, 2011, 07:31:10 am ---There are no ketone groups in that question so i mentioned "Aldehyde".
2,4-dnph reacts with Carbonyl compounds.

--- End quote ---
ya you are right but it was just for the reference

TJ-56:
How do we calculate the value of x in May June 2008 Paper 5 question 2 (f) ?
I plotted the mass of CuO on the y-axis against the mass of the basic carbonate on the x-axis. Now the 2 values to calculate the gradient are 5.70g (basic carbonate, x-axis) and 4.00g (CuO, y-axis). So how exactly do we use these numbers to calculate x ?
Appreciate any help.

thecandydoll:
OCt/Nov 2010 PAPER 53
How do you fill in the table?
DO we need to find conc in solvent a and b?
If so how?

noor.h92:
Hi,

has anyone done the 2011 biology paper 3. (As-level). In question 1ai- where you have to draw a graph what would be my x-axis and y-axis?

Navigation

[0] Message Index

[#] Next page

[*] Previous page