POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

[areebaization]

AHAAAaaa.. interesting x3
thanks alot D

lol welx

 

[natsume hyuga]

Emmm can anyone explain to me why "D" is th answer? :/
--> Oct/Nov 2004 Q.32 ^___^

galvanising is just coating it, not mixing the metals together.

 

[natsume hyuga]

May/June 2003 Q 32, chem
the answer is D, y D? :s
Why can't we electroplate it or grease it?

"Disregard for practicalities was also evident in the response to this question. All of the techniques mentioned
in the question can be used to prevent rusting but neither coating with grease nor electroplating are very
realistic in respect of a large object such as a girder for a bridge. "- examiners report
There u go, yup right answer areeba

 

[natsume hyuga]

i guess the answer "chromatography" for the question in the chem paper 61," how can you test the purity of the crystals?" is wrong, because the exact same question came in the 2003 may/june mcq paper (Q3)...the answer is to check its melting point.

 

[saroooor]

i guess the answer "chromatography" for the question in the chem paper 61," how can you test the purity of the crystals?" is wrong, because the exact same question came in the 2003 may/june mcq paper (Q3)...the answer is to check its melting point.

But I believe Boiling point is also Correct .

 

[natsume hyuga]

But I believe Boiling point is also Correct .

but then the crystals have to liquid...but then they wont be called crystals :S

 

[saroooor]

I actually don't remember the question , but was there crystals in it :S ?

 

[saroooor]

I AM TALKING ABOUT THE EXAM

 

[areebaization]

I actually don't remember the question , but was there crystals in it :S ?

V1?

 

[natsume hyuga]

yea v1 but forget it, the paper is done

 

[areebaization]

yea v1

I guess it was coffee grains
It should have been chromatography

 

[MERIHAN]

I guess it was coffee grains
It should have been chromatography

chromatography is the way to check if something is pure or not but i guess it will be correct if someone will mention a bit more detail that when we will perform chromatography it will not give range of spots if it is pure

 

[Abu mota]

19) Which potassium salt produces a yellow precipitate when it is dissolved in water and acidified
aqueous lead(II) nitrate is added?
A potassium chloride
B potassium iodide
C potassium nitrate
0 potassium sulphate

B, because it has iodide ions which cause a yellow precipitate

 

[thats_me]

19) Which potassium salt produces a yellow precipitate when it is dissolved in water and acidified
aqueous lead(II) nitrate is added?
A potassium chloride
B potassium iodide
C potassium nitrate
0 potassium sulphate
what is the answer?

Potassium iodide

 

[fishcook]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Biology (0610)/0610_s09_qp_1.pdf
Q29.. why is it C???

 

[thats_me]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Biology (0610)/0610_s09_qp_1.pdf
Q29.. why is it C???

the corn shows the ratio of purple :yellow ( 3:1)
so the offspring genotype should have the ratio 3:1
try crossing each of them the one that gives 3:1 ratio is the answer
when Pp x Pp the genotype ratio u'll get is PP ,Pp ,Pp ,pp

 

[RORA]

15 Which process can convert molecules to a new substance by removing hydrogen atoms?
A displacement
B fermentation
C neutralisation
o oxidation
why it is A

 

[thats_me]

15 Which process can convert molecules to a new substance by removing hydrogen atoms?
A displacement
B fermentation
C neutralisation
o oxidation
why it is A

In displacement salts are derived by displacing hydrogen from an acid.. so ACID is converted to SALT

 

[saroooor]

I guess it was coffee grains
It should have been chromatography

yes but boiling and melting is right I believe ???? I have a silly question to you which change was exothermic L--> g or g ---->L ???

 

[natsume hyuga]

yes but boiling and melting is right I believe ???? I have a silly question to you which change was exothermic L--> g or g ---->L ???

condensation, cuz heat is given off g to l