how was chemistry paper 22

[Jinkglex]

hey nacl conducts too!

NaCl is not a COVALENT chloride

 

[s_hithappens]

damn these 1 mark mistakes keep on building up. screw chemistry

 

[SB29597]

1) Not a ma'am.
2) I'd rather be sure.

Anyway. I think the NH3 weak base was NH3 + H2O -> NH4 + OH with a suitable description of how a weak base is one which does not dissociate completely in water.

With excess Ammonia whatever the compound was [the one with CL on the ends and OH in between] was getting NH2 on the two ends and replaced the OH, it was a nucleophilic substitution.

K2Cr2O7/H+ made carboxylic acid out of the alcohol, whereas KMnO4 cold dilute made a diol.

Almost perfect. But I think it made a triol- 3 OH groups. Two when the double bond broke and one on the side.

 

[s_hithappens]

SB29597 -->> this girl is going to kill the GT for us!!

 

[syed1995]

Almost perfect. But I think it made a triol- 3 OH groups. Two when the double bond broke and one on the side.

What? Which question was that? First one..? cuz I have already gotten myself to beleive I have lost those 3 marks

 

[syed1995]

Contact process requirements were Vanadium {V} Oxide catalyst, 450C temperature, 1ATM pressure.

Example of period 3 oxide and chloride could be P4O10 which burns with yellow flame and the chloride is PCL5 which leaves behind solution of PH 2.

Aluminium was the covalent chloride which could conduct as well as the cation with the best conductivity.

I gave Aluminum Tukka.. Since It's covalent and the only one which was a metal.. I had memorized the equation of [Al(H2O)5OH]+ but forgot that there good thing it was right.

I gave SO2 Burns with a blue flame... SCl2 and pH 2.

 

[fishcook]

wasnt the first questions equation :
NH3 + H+ (equilibrium sign) NH4+
isnt that the definition of a weak base?

 

[prettypearlshy]

This was an easy paper, but I made so many careless mistakes! I think I'm going to get 40s or so

same here! i think i made a few careless mistakes,just hoping for the best but yes the paper was easy! i really do hate my self if i get low grades

 

[prettypearlshy]

Oh shit bro, my friends got around 91 aswell. i screwed it up and got around 23 somthing *cries*

got 91.3%

 

[Beaconite007]

I gave Aluminum Tukka.. Since It's covalent and the only one which was a metal.. I had memorized the equation of [Al(H2O)5OH]+ but forgot that there good thing it was right.

I gave SO2 Burns with a blue flame... SCl2 and pH 2.

Lol, so my guess on AlCl3 was right too.
Gotta love a good tukka.
I gave Sodium for the coloured flame.
Yellow.
NaCl.
ph 7

 

[syed1995]

Lol, so my guess on AlCl3 was right too.
Gotta love a good tukka.
I gave Sodium for the coloured flame.
Yellow.
NaCl.
ph 7

yea I first wrote Na.. but wasn't about the color... so changed it to S cause uska pakka tha color.. Maachis

 

[plantaholic]

sheesh!
I got 23 too :/

i realized that i divided the 0.0088 mole value by two, instead of multiplying. so the mass calculated in the next part was wrong and resulted in the incorrect 22.1 value. but the method was correct.
lets hope they award the ecf marks and don't penalize

 

[SB29597]

SB29597 -->> this girl is going to kill the GT for us!!

I love you so much for saying that :*

 

[plantaholic]

yea I first wrote Na.. but wasn't about the color... so changed it to S cause uska pakka tha color.. Maachis

isnt na's flame white?
and yeah, good trick for the colour

 

[Resha rimaz]

Nope

dat crazy ques made me waste 15 mins!!!!!!!!!!!! Did you'll get 4 isomers .I only got 2

 

[Resha rimaz]

There was a chiral carbon.

Really Oh God . Can u tell how or draw the structure 4 us pls

 

[kazi umayer]

There was a chiral carbon.

which one was it ?

 

[SB29597]

dat crazy ques made me waste 15 mins!!!!!!!!!!!! Did you'll get 4 isomers .I only got 2

I got two first and then at then end i figured out the other two

 

[sweetjinnah]

Lol, so my guess on AlCl3 was right too.
Gotta love a good tukka.
I gave Sodium for the coloured flame.
Yellow.
NaCl.
ph 7

hey me too i wrote dat too....

 

[A star]

isnt na's flame white?
and yeah, good trick for the colour

Na has yellow flame