Edexcel CHEMISTRY DOUBTS!!!!

[AS01]

its the same here too i finished doing all of the past papers and i don't have any left can you plz email me some of the questions on chemistry too.
by the way how come you know everything have you completed your A levels?

[AS01]

hey can you plz say be what is the equation of bond enthalpy and mean bond enthalpy?
i know there  definition. but the way they ask in exam i am unable to recognise whether which is bond enthalpy and which one is not.
for example for the reaction given below
1/4CH4(g)=>1/4C(g)+H(g)
why is this the mean bond enthalpy of CH4 bond not CH4(g)=>C(g)+2H2(g)?
plz explain this in detail.

[AS01]

The human body contains around 0.025 g of iodine molecules, I2. Which of the
following shows the number of iodine atoms in 0.025 g of I2?
The Avogadro constant is 6.02 × 1023 mol–1.
Why the answer is this:-
0.025/126.9*6.02*10^23

not 0.025/253.8*6.02*10^23?

[Blizz_rb93]

The human body contains around 0.025 g of iodine molecules, I2. Which of the
following shows the number of iodine atoms in 0.025 g of I2?
The Avogadro constant is 6.02 × 1023 mol–1.
Why the answer is this:-
0.025/126.9*6.02*10^23

not 0.025/253.8*6.02*10^23?

i was wondering the same thing :/

& i have smth also

this is from Jan 2011 unit 1

question 3:

The Avogadro constant is 6.0 x 10^23 mol-1. Therefore the numbers of atoms in 1 mol of carbon dioxide is :

why is the answer 1.8 x 10^24 and not 6.0 x 10^23 :/

[Malak]

The human body contains around 0.025 g of iodine molecules, I2. Which of the
following shows the number of iodine atoms in 0.025 g of I2?
The Avogadro constant is 6.02 × 1023 mol–1.
Why the answer is this:-
0.025/126.9*6.02*10^23

not 0.025/253.8*6.02*10^23?

I suppose because the question asks for atoms of iodine and not molecules?

[Deadly_king]

I suppose because the question asks for atoms of iodine and not molecules?

Exactly

Each I₂ molecule consists of 2 Iodine atoms

[MKh]

Exactly

Each I₂ molecule consists of 2 Iodine atoms

Hi, just wanted to ask if u have done A2 Chemistry? Have you got any resources to prepare for the preparation question of the international written alternative to practical paper?
Any useful tips r also welcome.
Thanks in advance.

[The Golden Girl =D]

He's a college student ,and besides he did CIE  not Edexcel (:

[Deadly_king]

Hi, just wanted to ask if u have done A2 Chemistry? Have you got any resources to prepare for the preparation question of the international written alternative to practical paper?
Any useful tips r also welcome.
Thanks in advance.

I have completed my A2 Chemistry a year ago so I may not remember everything , am afraid. And yeah, I did CIE, not EDEXCEL

Am sorry I don't even know how your paper is especially the Alternative to Practicals for in my time I had done Practicals itself 

But you can ask any doubt and I'll try to help as much as  I can Insha Allah

Thanks Miss Invisble

[MKh]

^Oh yes, I knew that u did ur A/Ls from the CIE board but just wanted to confirm if u did A/L Chem as well.

Sure, INSHA ALLAH.

[Malak]

Can anyone give me a better explaination for this question. I dont understand the markscheme :S

Q: Explain why primary and tertiary bromoalkanes are hydrolyssed by different mechanisms.

It is from June 2010 unit 4

Thanks

[Deadly_king]

Can anyone give me a better explaination for this question. I dont understand the markscheme :S

Q: Explain why primary and tertiary bromoalkanes are hydrolyssed by different mechanisms.

It is from June 2010 unit 4

Thanks

I had the same doubt some time ago

Check my thread

[~ Miss Relina ~]

anyone sat unit 6 B exam ?

I need to discuss it but cann't find anyone........so I just was wonderiing if anyone can inbox me or somethnig....

[MKh]

anyone sat unit 6 B exam ?

I need to discuss it but cann't find anyone........so I just was wonderiing if anyone can inbox me or somethnig....

I sat for the Chemistry unit 6b exam. How did urz go, dear?

[Malak]

Just a reminder: Dicussion should take place here https://studentforums.biz/gce-as-a2-level-%28cie-edexcel%29/edexcel-january-2012-exam-thread-studentforums/