how was chemistry paper 22

[Waleed Amjad]

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

well i mentioned all of this. i think you have to mention about formation of equilibrium in this reaction too.

 

[Waleed Amjad]

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

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

Mg yes indeed burns with a white flame.
But if the reaction of MgCl2 is with H2O then the ph will be 6- 6.5
and if the reaction of Mg with water then the ph will be 13 .

 

[Waleed Amjad]

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

6.5 cuz OH- ions formed are not completely dissociated.

 

[Parsa Quazi]

Methanoic acid, or formic acid, is a compound with an unusual structure. Looked at one way, formic acid looks like a carboxylic acid, but looked at in another way it looks like an aldehyde.

.....O
.....||
H--C--O--H From the C atom look to the left and you will see the aldehyde.

Because aldehydes are oxidized by permanganate your solution will turn colorless. It should also produce some CO2 in the process. THIS is why I asked the question dude.

 

[Areeba Khan]

Well if they asked for colored flame.. I don't think they mean a white color flame included.. since then that will include all the oxides.. any thoughts A star?

oh are u shure ? :/

 

[Areeba Khan]

people white is a colour . colourless is not a colour . understand the difference

sO Mg burns wid white flame is that alryt?

 

[haha101]

sO Mg burns wid white flame is that alryt?

Perfect

 

[syed1995]

oh are u shure ? :/

Yea they asked for the color and if you wrote white then you're all good...

 

[Areeba Khan]

Yea they asked for the color and if you wrote white then you're all good...

obviously i wrote white but u said :Well if they asked for colored flame.. I don't think they mean a white color flame included ?

 

[syed1995]

obviously i wrote white but u said :Well if they asked for colored flame.. I don't think they mean a white color flame included ?

see the question mark at the end.. i was myself asking

 

[Areeba Khan]

see the question mark at the end.. i was myself asking

Oh okay