how was chemistry paper 22

[A star]

ppl.I wrote Mg burns with a white flame and pH=13 coz I remembered reading it somewhere

you will get a mark for flame

 

[SB29597]

ppl.I wrote Mg burns with a white flame and pH=13 coz I remembered reading it somewhere

Mg DOES burn with a white flame. I read that too. And it was a salt so pH 7 i think. lemme check that out

 

[A star]

Mg DOES burn with a white flame. I read that too. And it was a salt so pH 7 i think. lemme check that out

no PH of 6 it forms a complex

 

[sandrawrr]

I couldnt complete the moles sum T_T.. I kept getting 2. something for the weight of the compound..
For the first question is it okay to write "A weak base does not dissociate completely , NH4+ -> Nh3 + H+ or is that wrong?

 

[SB29597]

no PH of 6 it forms a complex

Are you sure? I hope they have a range like they usually do then :O

 

[sandrawrr]

Are you sure? I hope they have a range like they usually do then :O

pH of MgCL is 6.5 and pH of NaCl is 7

 

[A star]

Are you sure? I hope they have a range like they usually do then :O

i think MGO is PH of 6-7 is acceptable

 

[SB29597]

i think MGO is PH of 6-7 is acceptable

Love it

--does a little tap dance--

 

[SB29597]

pH of MgCL is 6.5 and pH of NaCl is 7

I guess 7 is acceptable then

 

[A star]

I guess 7 is acceptable then

actually 6.5 would have been better but depends on the examiner totally i guess but it should be .

 

[sandrawrr]

The first question where it had an organic part did it ask for a displayed formula or a structured?

 

[A star]

any question anyone any query i am feeling a need to check my answers

 

[SB29597]

The first question where it had an organic part did it ask for a displayed formula or a structured?

Displayed, I believe.

 

[A star]

The first question where it had an organic part did it ask for a displayed formula or a structured?

they ask for a structured in all except in one question they asked displayed and skeletal but displayed u wouldnt loose marks i drew both

 

[sandrawrr]

The skeletal formula had a carboxylic group yeh? and the last organic question where it said identify the group was it COOH as the "r" and the one which reacted with the Na2CO3?

 

[SB29597]

The skeletal formula had a carboxylic group yeh? and the last organic question where it said identify the group was it COOH as the "r" and the one which reacted with the Na2CO3?

Yes

 

[muhammadrafay]

yup no chiral i spent half hour trying to find the chiral -_- but i wasnt there

half hour ! Was your paper time :two hours ?

 

[sandrawrr]

Yes

Thanks!
For the first organic question with the box where it had Br2 in an inert organic solvent, does the -OH group get replaced by Br? aswell as the double bond breaking?

 

[A star]

half hour ! Was your paper time :two hours ?

i finished in half hour

 

[A star]

Thanks!
For the first organic question with the box where it had Br2 in an inert organic solvent, does the -OH group get replaced by Br? aswell as the double bond breaking?

no