Agreed.

Brilliant paper until q6...

Was hoping for 90%+ but oh no. Just, oh no...

I was speaking to my friend about Plumbate ions, and how I said "nah, we don't need to know them, they won't be on the exam". To which he replied "I'm gonna laugh when they come up in the paper and you're going to be sorry".

I was sorry, and hoping for a question on why Al2O3 is amphoteric, not PbO!

Reply 64

kane28

12ian34

Agreed.

Brilliant paper until q6...

Was hoping for 90%+ but oh no. Just, oh no...

I was speaking to my friend about Plumbate ions, and how I said "nah, we don't need to know them, they won't be on the exam". To which he replied "I'm gonna laugh when they come up in the paper and you're going to be sorry".

I was sorry, and hoping for a question on why Al2O3 is amphoteric, not PbO!

snap!! i completely forgot about amphoteric nature of lead oxide, but knew all of the reactions for amphoteric nature of Al2O3 and Al(OH)3

Reply 65

kane28

just to clarify, for the very first question, what type of carbonyl compounds do not react with K2Cr2O7??

Reply 66

lostinspace

pbO + 2hcl = pbcl2 + h20

pbO + 2naoh + h20 = na2Pb(OH)4

Reply 67

lostinspace

ketones do not react with acidified dichromate

Reply 68

Cyrus The Great

last 2 pages were actually really good for me tbh

it was the polyamide/polyester bit aswell as the 1 mark questions which i glossed over due to little time.

Reply 69

hh123

pbO + HNO3 = pb(NO3)2 + H2O

Reply 70

lostinspace

exactly if i had extra time, i wud have perfected alot of it

Reply 71

kane28

good, thats what i put
for PbO question i managed to work out the equation for it acting as a base, thouh i used H+ instead of HCl, although for actingas an acid i got it completely wrong