how was chemistry paper 22

[beeloooo]

percentage purity 91.5 ? right ? and yes oxidation +5 and -3 ! I hope of scoring 60/60 !

 

[sandrawrr]

K floats on water , doesn't sink ! and C i dont think it actually does form a pi bond :/ isnt it single bonded ?

it can form double bonds c=c alkenes?

 

[thp2011]

there are delocalized pi bonds in graphite i.e. Carbon had read it somewhere in the endorsed book..

 

[A star]

i wrote K sinked

no K doesnt sink it floats ans is Mg

K floats on water , doesn't sink ! and C i dont think it actually does form a pi bond :/ isnt it single bonded ?

no beeloooo u r right only possible answers are
O and N

 

[A star]

it can form double bonds c=c alkenes?

no sorry it wanted molecule of C

 

[sandrawrr]

no sorry it wanted molecule of C

just gotta hope that I dont get more than -10 cause of silly mistakes sigh... Would S be considered to form a toxic gas?

 

[shah zaib]

Mg is the one which sinks right?

but Mg does not react with cold water.
answer was calcium

 

[FRENZYAMU]

b

no K doesnt sink it floats ans is Mg

no beeloooo u r right only possible answers are
O and N

but Mg doesnt react readily !

 

[A star]

but Mg does not react with cold water.
answer was calcium

it does react but slowly but answer was calcium

 

[A star]

b
but Mg doesnt react readily !

sorry i meant calcium typo

 

[FRENZYAMU]

sorry i meant calcium typo

SHIT i crossed out Ca nd instead wrote K......

 

[sandrawrr]

Is it Calcium or Mg?

 

[A star]

calcium but magnesium MIGHT be accepted none of the first group elements they float

 

[shah zaib]

it does react but slowly but answer was calcium

exactly...a way-too-slow reaction

 

[shah zaib]

Is it Calcium or Mg?

calcium.

 

[sandrawrr]

what about a toxic gas?

 

[shah zaib]

forms covalent chlroride which conducts when in solution...was it Al or H ?

 

[sandrawrr]

forms covalent chlroride which conducts when in solution...was it Al or H ?

i wrote Al

 

[shah zaib]

what about a toxic gas?

i wrote C. And i guess it's right.

 

[shah zaib]

i doubt Al. H is, though, the right one as well.