Edexcel CHEMISTRY DOUBTS!!!!

[Amii]

Love ya 

Love you too 

[Weaam]

I think this is the file - the question paper and the answers both are there

Take care  

THAAAAAANK YOUUUUUU!! ;DDD

[Amii]

THAAAAAANK YOUUUUUU!! ;DDD

No problem 

[Weaam]

No problem 

Dudee, ur a life saverrrr   

[The Golden Girl =D]

I got some doubts in the paper

Q5] , Q9]a)c) , Q11]a) b) .... Q12 ] and 13] ..Q15]e)i) ii)


I'll come back tmrrw if I have any further doubts iA


Thanks

[Amelia]

Ans 5) Ethanol is C2H5OH so it is made up of carbon, hydrogen and oxygen. Carbon exists as a solid in its elemental state so is written as C(s). Hydrogen and oxygen exist as diatomic gases in their standard states so they are written as H2(g) and O2(g) respectively. Then you need to balance the equation but don't forget you are only allowed 1 molecule of your product on the right hand side of the equation.
Hence, the equation would be: 2 C(s) + 3 H2(g) + 0.5 O2(g) --> C2H5OH(l)

So, the answer is D.

9)a) Ionization Energies decreases down the group, the greater the atomic number - size of the atom increases resulting in less nuclear pull.
     So, the answer is A.
   c) Noble gases have filled shells, which is the most stable configuration for an atom. Removing an electron from a noble gas would increase the energy more than if you removed an electron from, for example, nitrogen.
Answer is D (though I'm not sure about this one. )

[Amii]

Lia the answer for 9c is D but I dont understand why not B 

[Amelia]

12) some chlorobromoethane is produced when aqueous bromine reacts with ethene in the presence of sodium chloride, indicating that the  bromine is added to the double bond by slow electrophilic addition before the rapid addition of the chloride ion:

C2H4+ Br2-> C₂H₄Br⁺+ Br-
C2H4Br++ Cl--> C2H4BrCl

Ans is B.

[Amii]

13) D

CH₃  Cl
 C  =  C
 H     CH₃  

Here the high priority ones are Carbon and Chlorine - both are on the same side so Z
The Cl atom is attached to the 2 carbon(as it should get the smallest no possible) so

Z-2-Chlorobut-2-ene

According to me D should be the answer
but C in the ms I dont understand why - Liaaaaaaaaa help  

[Amelia]

13) D

CH₃  Cl
 C  =  C
 H     CH₃  

Here the high priority ones are Carbon and Chlorine - both are on the same side so Z
The Cl atom is attached to the 2 carbon(as it should get the smallest no possible) so

Z-2-Chlorobut-2-ene

It is D, something's up with the markscheme.

According to me D should be the answer
but C in the ms I dont understand why - Liaaaaaaaaa help  
[/quote]

[Amii]

15)ei-
1.20 nanomole dm ^-3 should be converted to mol cm^-3so
since 1 mol = 10^-9 nanomol

1.20 * 10 ^-9

then to covert the dm3
1000 cm³= 1 dm³

1.20 * 10 ^-9 *10^-3

=1.20 * 10 -12 mol dm-3

C=n/V
Volume = 1cm3
so C*n=(1.20*10^-12 ) *1 = 1.20*10^-12 moles

the Mr of Mg = 24.3
n=m/Mr
m=n*Mr
m=(1.20*10^-12 ) * 24.3
=2.916*10^-11
=2.92*10^-11 g

[Amelia]

11a) it's D.
 Addition reaction of C₄H₁₀
b) Ans is C - presence of Double bonds.


Thanks, Mr. Holmes.

[Amii]

11a) it's D.
 Addition reaction of C₄H₁₀
b) Ans is C - presence of Double bonds.


Thanks, Mr. Holmes.

I should be thanking you Prince hamlet   +rep ---- 1 is already pending

thanxxxx liaaaa-love you  

hey check the 15th one - my answering way looks very messy  

[Amelia]

I should be thanking you Prince hamlet   +rep ---- 1 is already pending

thanxxxx liaaaa-love you  

hey check the 15th one - my answering way looks very messy  

It's fine, as long as GG can understand.

[The Golden Girl =D]

Moi is srry will look at it when I later iA