IGCSE CHEMISTRY 2013 (May 20th & June 10th)

wat other questions were there?? 1st page was gap fill the next page was the ph question the next was a temperature table and you had to fill in gaps. the next page was a graph. the next page was zinc and mg question. last page was electrolysis. there was a landfill question and volume calc question which was 72. there was a page on Nacl and Na and a page on NaOH and how to test for chloride ions. there was a page on chromotography. were there anymore????? if any1 remembers please tell. i need to know where i lost my marks.

Reply 781

Polydeuces

Original post by Kunjamani

wat other questions were there?? 1st page was gap fill the next page was the ph question the next was a temperature table and you had to fill in gaps. the next page was a graph. the next page was zinc and mg question. last page was electrolysis. there was a landfill question and volume calc question which was 72. there was a page on Nacl and Na and a page on NaOH and how to test for chloride ions. there was a page on chromotography. were there anymore????? if any1 remembers please tell. i need to know where i lost my marks.

there was a calc at the end which was 2.5, a few graphs (a bar graph and a line graph) there was also the test for alkenes and addition reactions of bromine, a question to say why it was difficult to compare the reactivity of two compounds (cannot remember which ones) and a solubility and salt making question

Reply 782

Kunjamani

2

Original post by Polydeuces

there was a calc at the end which was 2.5, a few graphs (a bar graph and a line graph) there was also the test for alkenes and addition reactions of bromine, a question to say why it was difficult to compare the reactivity of two compounds (cannot remember which ones) and a solubility and salt making question

what was the salt making question

Reply 783

Polydeuces

Original post by Kunjamani

what was the salt making question

never mind you said it in your comment already. NaOH

Reply 784

Kunjamani

2

does any1 know anymore questions or is that it?? i reckon i got around 50ish but i need to know where i lost my marks but cant remember all the questions

Reply 785

dstunr

For the 5 marker, was I wrong to talk about how sodium is in group 1 so because the electron is far away from the nucleus very little energy is needed to break the attraction between the electron and the protons in the nucleus so that's why it has a low boiling point

Reply 786

beastblue

Original post by dstunr

For the 5 marker, was I wrong to talk about how sodium is in group 1 so because the electron is far away from the nucleus very little energy is needed to break the attraction between the electron and the protons in the nucleus so that's why it has a low boiling point

I talked bout that saying it is lower than typical metals but mainly said sodium and chloride ion had stronger bond than sodium ion and electron

Reply 787

Yazzah

for the q that said why are they not sure which reaction is more vigorous i said that they the metals were both in group one and the others were both in group 7 so they both have the same amount of elecotorns in their respective outer shells

Reply 788

LookIts_Liam

10

Original post by ADGMFC

which was 50g and which was 56g, unsaturated or saturated?

I can't remember, that wasn't part of the question though

Reply 789

apselv

Original post by Hoshil

Even I wrote that. Can u confirm the answer for ?1 :
. Filtration
. Simple distillation
. Dissolving
. Paper...
. Fractional distillation

For the rose petal question, can u say filtration, instead of dissolving?

Reply 790

Polydeuces

Original post by apselv

For the rose petal question, can u say filtration, instead of dissolving?

no

Reply 791

lustandturqoise

would i still get a mark if i said graphite can be used for the electrodes :frown:

i put carbon and crossed it out aah

Reply 792

Polydeuces

Original post by dstunr

For the 5 marker, was I wrong to talk about how sodium is in group 1 so because the electron is far away from the nucleus very little energy is needed to break the attraction between the electron and the protons in the nucleus so that's why it has a low boiling point

I talked about the strong electrostatic attraction between ions of sodium chloride, that it has a 3D lattice with many repeating units.
And with sodium I talked about the actual structure of the giant metallic structure. Where Sodium has weaker forces between the array of positive ions, and the delocalised electrons make it easier for electrons to transfer heat throughout the metal.

Reply 793

Polydeuces

Original post by lustandturqoise

would i still get a mark if i said graphite can be used for the electrodes :frown:

i put carbon and crossed it out aah

yeah they mean the same thing in essence. Graphite is an allotrope of carbon anyways

Reply 794

GunnerGuy

9

Original post by apselv

For the rose petal question, can u say filtration, instead of dissolving?

Idk but it doesn't seem ryt as filtration is removing a solid from a liquid but here there is no liquid.

Reply 795

username1112782

2

Original post by lustandturqoise

would i still get a mark if i said graphite can be used for the electrodes :frown:

i put carbon and crossed it out aah

The electrodes have to be made from platinum for that particular electrolysis... if they were carbon, they would react with the oxygen forming at the anode

Reply 796

lustandturqoise

Original post by Yazzah

Let's stop stressing and focus on the bio paper now, from the chem and physics papers I'm contemplating not even revising the bold stuff

what if biology is all on the bold stuff haha anyway biology is difficult itself :/ they didn't even ask about any structure of diagram in P1?

Reply 797

lustandturqoise

for the test of chloride ions, is it alright if i put add some silver nitrate sol'n and nitric acid. do they have a particular order of which one to be added first? :/:/

Reply 798

apselv

Original post by jongahead

i put naoh wasn't right cos it said X was a solid, but sodium hydroxide is a liquid/aqueous at rtp...
is that right???

and also is carbon for the electrode right? cos then for another question when it asked why less oxygen was produced i said some may react with the electrode...

yea, i wrote the same thing, even i said NaOH was a liquid not a solid. (great brains think alike.) :P

yep, carbon.

Reply 799

username1194059

11

The one about sodium and potassium reacting vigorously was about them being so close to each other in the reactivity series right?

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IGCSE CHEMISTRY 2013 (May 20th & June 10th)

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