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Guys the reaction of aluminium with chlorine i made AL2CL6 intead of AlCL3 how many marks do u think will be deducted? I personally think the examiner is gona allow this answer too
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I wrote Al2Cl6 too, darn! I'm not entirely sure if it's incorrect though.Guys the reaction of aluminium with chlorine i made AL2CL6 intead of AlCL3 how many marks do u think will be deducted? I personally think the examiner is gona allow this answer too
All correct, i'm not sure about one though.For Question 1, the element for liquid chloride was either phosphorus or silicon. For the coloured flame, it was sodium since it burns with a yellow flame in Cl2. For observations it could have been: Al glows, white solid formed/appears, Cl2 colour fades away/disappears (any 2) AlCl3 reacts with water to form Al2O3 and HCl, only Na dissolves, both Al and Si react. pH for Na was 7/neutral, for Al and Si the range of pH was 1-4 (any value in the given range) though i personally wrote 3 for Al and 2 for Si.
No,it was just about the element,as far as I remember,wrote Sulphur as it burns wid blue flame.rogue94
are u sure dat da ques was abt in chloride and not oxide??? coz i wrote it as sulfur burning with a blue flame in oxide...
I think they'll allow it caz as i read so it becomes solid at a very high temp. And i didnt expect it to go there just on heating in labortaryI wrote Al2Cl6 too, darn! I'm not entirely sure if it's incorrect though.
[Although AlCl3 dimerises at low temperature to form Al2Cl6, there was heating involved so..]
Sulfur DOES burn in blue flame hes wrongrogue94
are u sure dat da ques was abt in chloride and not oxide??? coz i wrote it as sulfur burning with a blue flame in oxide...
SULFUR burns in blue flame in chlorine and in oxygen. U got mixed upFor Question 1, the element for liquid chloride was either phosphorus or silicon. For the coloured flame, it was sodium since it burns with a yellow flame in Cl2. For observations it could have been: Al glows, white solid formed/appears, Cl2 colour fades away/disappears (any 2) AlCl3 reacts with water to form Al2O3 and HCl, only Na dissolves, both Al and Si react. pH for Na was 7/neutral, for Al and Si the range of pH was 1-4 (any value in the given range) though i personally wrote 3 for Al and 2 for Si.
Was it burning in oxygen or burning in chlorine?? :\SULFUR burns in blue flame in chlorine and in oxygen. U got mixed up
If its chlorine then both sodium and sulfur are correct answers....no? :| bcuz i wrote sodium, i hope sodium isnt wrong :\ and i m sure sulfur is correct!
I too think it was +129, but the reasoning is incorrect. Combustion is always exothermic, and they hadn't asked the enthalpy of combustion, it was of the reaction i guess. Empirical formula is C6H8O7Assalamu Alaikum!!
brother now no need to worry about in past wat happened. anywayz answers for your questions are below..
ques-1: table was for 6 marks.
ques-2: i am not sure but most probably coz at school once i made that mistake and my teacher cut marks for that..
ques-3: it is +129 as combustion is an endothermic reaction.. am i correct i too have a doubt in that..
ques-4: i think its using the main formula of the compound G which was supposed to be C3H6O3. thats why the empirical formula was CH2O... that means it had 3 oxygen one was for ketone and the other two was for alcohols.
ques-5: it was CHO.
Are you guyz sure it was burning in chlorine gas/oxygen gas, coz as far as I remember it was the flame test of the CHLORIDE they had asked, no?
Anyway.
SiCl4 forms HCl in water, I wrote pH 1.
Did they ask the enthalpy change of FORMATION of Methanol or the enthalpy change of the REACTION? I think it was the reaction and the answer was +129, most of my friends got that too :-/
1 mol of compound forms 2 mol of hydrogen atoms, one -OH group will give one H atom, so gotta be 2 -OH groups in 1 mol of compound to give 2 mol of H atoms.
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