Qualification > Queries
How were the exams?(Edexcel)
TwilightBreak:
Hi..sorry im new here..i dont know why the line shouldnt be going thru the origin..for refraction to occur, the incident light should hit the block at angle. if it doesnt hit it at an angle , the no refraction occurs. By the way this qs..? is bcasically yr 10 stuff right? like pure ig.
I wrote that it should pass thru the origin..
M-H:
--- Quote from: AS-Girl on May 14, 2010, 07:52:00 pm ---i dont do edexcel but heard that chemistry was hard...especially the mole question!!
was it??
--- End quote ---
NOOOOOO it was easy!!! i mean it was good...and maybe yes the questions seemed prolly scary but u really gta keep ur cool ...they wer prty strait!!
thats what i thot..
n yeh...im positiv the graph in phy shud pas thru origin...
cz its like all graphs that hav a gradient that measures a kinda property..like fr young modulus...they all wil ofcourse giv u a zero if pas thru origin...light duznt bend when the angle is zero...its only the speed that changes...n refractiv index is more like sth that measures hw much bendin -um thats what i think....!!:|
Book lover22:
n wat abt the test 4 OH- ions in chem ? :S
N da colour of da starch indicator?
n which flask did u guys use?
n wat were da 4 things on da diagram?
n n n heehehe! dats it i ithink! :P
M-H:
--- Quote from: Book lover22 on May 15, 2010, 09:26:04 am ---n wat abt the test 4 OH- ions in chem ? :S
N da colour of da starch indicator?
n which flask did u guys use?
n wat were da 4 things on da diagram?
n n n heehehe! dats it i ithink! :P
--- End quote ---
test frr oh- : add methyl orange(color change: orange to yellow) or phenolphthalein(color change from colorles to pink)
starch color change- blue to white..
standard flask
n 4things-i made only the condenser wt the corct arows of water goin in n comin out
um others nah:( thou they gta b the beaker n...um...duno hehe
nzpd9:
for test for OH- i put use red litmus paper nd it turns blue .. shouldve put methyl orange or phenolphalein..
Starch indicator goes from blue-black to colourless! not white!
You use a Volumetric Flask to make up the standard solution...
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