Edexcel CHEMISTRY DOUBTS!!!!

[The Golden Girl =D]

C1     -     CH₄     -    No other isomers

C2     -     C₂H₆   -    No other isomers

C3     -     C₃H₈   -    No other isomers

C4     -     C₄H₁₀  -   2 isomers in all

C5     -     C₅H₁₂  -   3 isomers in all

C6     -     C₆H₁₄  -   5 isomers in all

If you have time, do take a look at the attached powerpoint presentation. It describes all what you need to know in organic chemistry.

Jazaka Allahu Kulla kair mate ^_^

[Deadly_king]

Jazaka Allahu Kulla kair mate ^_^

Rafwan Oukhtii.....

[The Golden Girl =D]

Afwan Oukhtii.....

When An Arab says that you say in return Wa Jazak*

*Jazaki for a girl , Jazakom for a group

Afwan is mostly for when someone says Shukran/shukran Jazeelan

[Deadly_king]

When An Arab says that you say in return Wa Jazak*

*Jazaki for a girl , Jazakom for a group

Afwan is mostly for when someone says Shukran/shukran Jazeelan

Ooh thanks for the info.

But shukran means thanks and afwan is you're welcome, right?

[Weaam]

Question:
In june 09 Q8, i dont get why the answer is D?
And Q16 ?
And Q 17?
And Q18 ?
Need help ASAP.

[elemis]

Une momento

[elemis]

Can you upload the paper, please ?

[The Golden Girl =D]

here it is Ari ,

[The Golden Girl =D]

Question:
In june 09 Q8, i dont get why the answer is D?
And Q16 ?
And Q 17?
And Q18 ?
Need help ASAP.

Q8] If you draw ALL of them you will notice that there are two SIMILAR groups on ONE carbon ( fi kulhom ma3ada D ) so how would you have a geometric isomers

Sorry but that that's what I can do for now i gotta go -.-

[elemis]

Okay give me ten minutes.

[elemis]

Question 16

The answer is A. This is because all the other options have several electrons in between the outer electron shell and nucleus. This would provide electron shielding which would reduce the first Ionisation Energy.

For answer A the only electron is being tugged on very hard by the strong force of attraction of the nucleus leading to a HIGH 1st IE.

1s¹ is obviously Hydrogen.

[elemis]

Question 17



1gram of ethane = 0.03448 moles

Using above equation :

0.03448 moles * 8.314 * T  / p ; 0.28669*T/p

Doing the same thing for the others you should be able to determine the answer.

[elemis]

Question 18

Mg²⁺ is the answer

Only cations will have lost electrons leading to a fall in ionic radius.

However, anions will gain electrons leading to an increase in ionic radius.

Thus we eliminate A and D.

Now we must choose between Mg and Na.

Mg has more protons than Na. Hence, Mg's nucleus has a greater positive force of attraction which works on its. electrons

When it loses its electrons this RELATIVELY larger force of attraction will attract the outer electrons inwards more than Na can. This will shrink the ionic radius EVEN MORE than Sodium.

[elemis]

Question 9

Answer is A.

Bond lengths INCREASE down a group and DECREASE across a row <----- remember this.

[Weaam]

Question 16

The answer is A. This is because all the other options have several electrons in between the outer electron shell and nucleus. This would provide electron shielding which would reduce the first Ionisation Energy.

For answer A the only electron is being tugged on very hard by the strong force of attraction of the nucleus leading to a HIGH 1st IE.

1s¹ is obviously Hydrogen.

In the mark scheme, its B.