CIE A Level Chemistry Solved Past Paper Feb/March 2019 P22

This video provides solution to Paper 2 Variant 2 of Feb/March 2019. For more detail of concepts, please visit this link examhelpweb.com/cie-a-level-chemistry-solved-past-paper-feb-march-2019-p22/

[@Faisal-u7j]

You just copy the mark scheme lol

[@nurulsolehah6801]

For q4, how did you know/how should I have known that it would be hydrolyzing nitrile and not the ester?

[@jananabawy2328]

How did we know it’s ClF3? Why can’t be more than one Cl? For the question with the MR = 92.5

[@examhelpweb2090]

Try distributing the mass between different number of Cl and F, you will notice that this is the only possible structure.

[@mariamukter3402]

u aren't even solving it properly, ur just writing down the answers for most questions...almost all of us are asking questions in ur comment section

[@AbdulMuizprofile]

at 12:24 u missed 2p6 in ec of chloride ion

[@vibhutg1919]

1b) u have to balance it so its gonna be 3Mg

[@nadyahinay6759]

@Examhelp web 5:17 how do u if only oxygen is involved in bond breaking and not nitrogen.??

[@tatamic5771]

i had the same question T T

[@tatamic5771]

@@kamranzaki1960 thank you so so much!!

[@alik6422]

in 3d i dont get how C≡N has a weak peak, like its pointy and all. what does weak peak mean in IR?

[@coldfri4302]

In question 3 isn’t it supposed to be Q has no reaction(since it’s a ketone) and R turns green(since it’s an aldehyde)?

[@examhelpweb2090]

You are right that's why I played that title "Its the other way round".

[@media9755]

in 2 ciii ,isnt decomposition an endothermic reaction? why is delta H negative ?

[@examhelpweb2090]

Decomposition is usually endothermic. Here you do not need to explain why that is the case. The question only requires you to sketch the enthalpy change of the reaction

[@media9755]

@@examhelpweb2090 decomposition is USUALLY endothermic ?? i was taught that it’s always endothermic ..

[@emaankhan6556]

in Q-3 how is it an aldehyde if there is no double bond o

[@IgweDaniel-ft9bq]

do they give us data booklet? in the exam

[@ultimatelegendz2700]

no

[@sreeramsj830]

5:51 496*

[@examhelpweb2090]

Right!

[@kalyaniparthasarathy754]

Did you forget 2p6

[@canyonmoon9647]

Can you pls explain question 2 part ii explanation part of iodine didnt get u cuz you added something abt chlorine while explaining

[@examhelpweb2090]

When Cl reacts with Fe, FeCl3 forms where Fe has oxidation no. of +3 whereas when I reacts with Fe, FeI2 forms where the halide ion has oxidation no. of +2. This tells that I2 has relatively low oxidising power as compared to that of Cl2 (both halogens are reacting with same reagent i.e. Fe so comparison is being done of their power to oxidising).

[@expertmorphy8810]

Thank you, was helpful

[@LIGHtSsCAmeRaACtioN]

please keep making videos!!