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Edexcel iGCSE Chemistry - 19th May 2016 - Predictions?

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Reply 20

Alex.trin

Does anyone understand the difference between HCl in water and methylbenzene?

Reply 21

Themightyboo

HCl is a gas at rtp, but dissolved in water dissociates and and produces H+ ions, and Cl- ions so it's acidic. HCl in methylbenzene doesn't dissociate, no ions so not acidic. Any hint of water though, and it'll behave like an acid again :smile:

Reply 22

Themightyboo

That bio exam was NOTHING like any of the past papers I've seen... It was just random. Like a different syllabus completely!! Good luck tomorrow folks!

Reply 23

Talkand...Talk

Hey guys!!
I'm 12 and i'm taking Chem tomorrow as well, so far I've revised titraion, activation energy, fractional distillation, global dimming, percentage yield, relative formula ,atomic mass, the thermit reaction, exothermic and endothermic, limestone cycle, extracting iron, the haber process, electrolysis of brine, flame test for negative and positive ions, and i done this ALL IN ONE DAY! Bcz yesterday the bio was pretty hard so i just started focusing on Chem because i'm thinking that it will be hard as well lol.

Reply 24

preptofail

can someone explain addition polymers?

Reply 25

MMay2000

HCL disassociates in water to form H plus ions and OH minus ions and doesn't in methylbenzene - HCL dissolved in water to make Hydrochloric Acid basically

Reply 26

Droneon

Do we have to learn the formulae of the addition polymers? Do you think they'll give that?

Reply 27

Alastair H

Original post by Droneon

Do we have to learn the formulae of the addition polymers? Do you think they'll give that?

That is only on paper 2.

Reply 28

Fraser_

Original post by preptofail

Can someone explain calimetry for measuring enthalpy changes?

Is that when you do: Change in temp X 4.2 X Amount of water?

Reply 29

Droneon

Good luck y'all. :smile:

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Reply 30

mahaaz.lone

There was hardly any organic chemistry on it! no blast furnace, no electrolysis, no iron or aluminium extraction.... FFS all the things i revise somehow are not in the test. Cheers edexcel you snakes

Reply 31

Abodee1

Easiest exam in the history of chemistry ?!

Reply 32

ursulab

What did you guys say for the reasons u were supposed to add water and solution y?

Reply 33

Year11Struggles

Original post by Abodee1

Easiest exam in the history of chemistry ?!

yh that was disgustingly easy

Reply 34

Year11Struggles

Original post by ursulab

What did you guys say for the reasons u were supposed to add water and solution y?

For water I put:
To remove residual solution X
For solution Y I put:
To remove water
For why there is a difference I put:
Solution Y has a lower concetration