Chemistry Paper 22: Discussion and Grade Threshold

[littlecloud11]

Two more questions

1) the reaction of chlorine with either water or oxygen. I don't remember the 2nd element. What was it an I answered dispropotionation. Is that correct.

2) Reaction of al + cl I wrote as

2al + 3cl2 ---> 2alcl3

And observations I wrote
1) silvery metal turns to white solid (which is probably correct)
2) container feels warm to touch. Now is this correct since I figured that energy in bonds broken are less than bond
made, it will be exo. Any idea whether it will be correct?

It can't be disproportionation. The question said 'what type of reactions occur when chlorides react with water'. not Cl2. Chloride salts. And that's hydrolysis. And i think for the observation you had to mention the color of chlorine fading, a white solid forming or the metal glowing. They'll probably not accept answers related to heat. Not sure though.

 

[fathimaash]

ya so observation can be
01. pale yellow solid formed
02.Al glows
03.Cl2 colour fades

 

[Khalifa]

It can't be disproportionation. The question said 'what type of reactions occur when chlorides react with water'. not Cl2. Chloride salts. And that's hydrolysis. And i think for the observation you had to mention the color of chlorine fading, a white solid forming or the metal glowing. They'll probably not accept answers related to heat. Not sure though.

Yeah my bad, I thought it said chlorine and the cl2 observation slipped out my mind during the paper. I just thought in terms of bond energy, because less and weaker bonds are being broken to more and stronger bond, reaction would be exothermic. So I wrote that the container would feel warm to touch.

 

[mominzahid]

No, my bad, i did paper 21 not 22. It was a 10 marks organic question. Anyways thanks for accusing me of cheating bro -__- If i wanted to do that i would have atleast tried with another account, i'm not stupid.

Hahah my apologies. :$
Its just that paper discussion isnt allowed b4 24 hours and you asking the answer of q5 which never existed..(in component 22 which most of us gave).. the odds were against you bro.. but agnn.. MY APOLOGIES.

 

[Khalifa]

What if I drew the structural formula and displayed formula both? Any harm done?

 

[fathimaash]

What if I drew the structural formula and displayed formula both? Any harm done?

no not at all

 

[lollolzzz]

What if I drew the structural formula and displayed formula both? Any harm done?

You mean for which question?