Chemistry as level cie m/j 2019 paper 21

The exam was really easy ... What did u get for the Mass of chlorine ... I got 0.1158 = 0.116 but all my other friends got something different because when u find moles = pv/rt then I multiplied by 35.5 all my other friends multiplied by 71 .. All whats ur similarities in the first q of X and the group twos ... I said that they both have the same oxidation state ( 2) and their carbonattes decompose the same way forming metal oxide and co2 ... and the difference.is that group 2 oxide is white while x oxide is black

The exam was really easy ... What did u get for the Mass of chlorine ... I got 0.1158 = 0.116 but all my other friends got something different because when u find moles = pv/rt then I multiplied by 35.5 all my other friends multiplied by 71 .. All whats ur similarities in the first q of X and the group twos ... I said that they both have the same oxidation state ( 2) and their carbonattes decompose the same way forming metal oxide and co2 ... and the difference.is that group 2 oxide is white while x oxide is black

you were supposed to find the number of chlorine atoms. so you use the same mass and divide it by 35.5 to the number of moles and times it by 6.02*10^23 that’s what i did

Yep exactly, I did that too

For the mass of chlorine I multiplied by 71 and got 0.232g
For similarities and differences I wrote that too
What did you write for the organics 8 mark table question? One with tollen’s reagent

Star ⭐️

for the tollens reagent i wrote the letter of the aldehyde (B i think) and then the observation o wrote Silver mirror (Silver metal)

Yeah, and for alkaline iodine I wrote the one with ketone A and yellow precipitate
For sodium I wrote c,d and effervescence as observation

Yeah, and for alkaline iodine I wrote the one with ketone A and yellow precipitate
For sodium I wrote c,d and effervescence as observation

you were supposed to find the number of chlorine atoms. so you use the same mass and divide it by 35.5 to the number of moles and times it by 6.02*10^23 that’s what i did

For the iodine one i wrote A and D cause D also has the CH3CO group and then for the sodium i only wrote C lol😂 but yeah my observations are the same

For tollens Only the ketone and a silver mirror is formed as observation ... in Alkaline iodine only the aldehayde ... and yellow ppt ... in Na. Metal only carboxylic acid and alchol ... and White solid is formed

For tollens Only the ketone and a silver mirror is formed as observation ... in Alkaline iodine only the aldehayde ... and yellow ppt ... in Na. Metal only carboxylic acid and alchol ... and White solid is formed

only the aldehyde reacts with tollen