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Edexcel IAL Chemistry Unit 2 (WBIO2) / June 10th 2016

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In that answer we are supposed to identify the oxidising agent in the reaction so we habe to look for the entity that has undergone reduction i.e a decrease in the oxidation state NaIO3 or even IO3^1- is acceptable
June 2014 IAL Q1 b please! :frown:
i have a question if anyone can help me plz

which of the following has the largest number of lone pairs
CH2=O
CH3Cl
CH3NH2
CH3OH
Original post by mr.holmes
i have a question if anyone can help me plz

which of the following has the largest number of lone pairs
CH2=O
CH3Cl
CH3NH2
CH3OH


First compund has 2
Second compound has 3
Third compound has 1
Last compound has 2
Reply 84
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mh99
9
11111.PNG
can someone explain why it changes to colourless
Bromine water test
Reply 86
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mh99
9
Original post by AlvlVictim
Bromine water test


Thanks
Original post by mh99
11111.PNG
can someone explain why it changes to colourless


It is cyclopentENE, which means that it has carbon carbon double bond. The pi bond in the double bond breaks and the bromine is added to the organic compound. If all the bromine reacts, there is no bromine solution left so the original colour (brown) turns to colourless.
Reply 88
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mh99
9
788.PNG
can someone explain it
Original post by mh99
788.PNG
can someone explain it


The equation of calcium hydroxide is Ca(OH)2 so there is one calcium ion and two Hydroxide ions which add up to 3.

In OH ion, you have 8 electrons from the oxygen, 1 electron from hydrogen, and 1 electron from calcium which add up to 10.
Reply 90
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mh99
9
Original post by omar5478
The equation of calcium hydroxide is Ca(OH)2 so there is one calcium ion and two Hydroxide ions which add up to 3.

In OH ion, you have 8 electrons from the oxygen, 1 electron from hydrogen, and 1 electron from calcium which add up to 10.

i get the first part b (i)
but i don't get the second part,
if you get 8 electrons from oxygen and one electron form hydrogen where does calcium come into this if it OH-? should it be 2 electrons from hydrogen atom??
Reply 91
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wenogk
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Hey guys how was the exam? I found it ok.. What was the last answer?
Reply 92
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hasi.99
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Hey guys , how did it go? I too found it ok.
Reply 93
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Becka99
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What did you write for the product of water with Cl2O7 .
And in the mcq which gave a peak at m/e value 31
Reply 94
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wenogk
6
Original post by Becka99
What did you write for the product of water with Cl2O7 .
And in the mcq which gave a peak at m/e value 31


Had no idea about the Cl2O7 thing,
the m/e was for 31 was the first option(can't remember what is was tho)
Reply 95
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Becka99
1
Original post by wenogk
Had no idea about the Cl2O7 thing,
the m/e was for 31 was the first option(can't remember what is was tho)


I think it was propan-01-ol but how did you get it....like which fragment gives that?
But yaaaaaaaay our exams are over...
Original post by Becka99
What did you write for the product of water with Cl2O7 .
And in the mcq which gave a peak at m/e value 31


I think it was 2HClO4
Reply 97
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wenogk
6
Original post by Becka99
I think it was propan-01-ol but how did you get it....like which fragment gives that?
But yaaaaaaaay our exams are over...


Lucky :frown: 10 more days to go.. Oh yeah then the formula would be CH3CH2CH2OH and the last bit CH2OH gives 31, (12+1+1+16+1)=31.
Original post by sumanamalik10
I think it was 2HClO4


Same

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