Edexcel IGCSE Chemistry Paper 2C-4CH1 12th June 2019

OP

He's talking about when handling acids and bleach...
which are corrosive.

but I didn't put that answer

Isaid the same things......not sure if saftey Goggles is the right answer as I said the burette or the equipment mentioned in that question must be below eye level..........why is nitrogen oxide produced?

What did you all ok for the disadvantage?

Reply 41

joejoeeames

12

I'm agreeing with you... putting a GAS MASK is silly.
I replied to your correction by accident sorry
and yes... he is off his nut lol

Original post by leo1233

you should have hahaha

Reply 42

Suley143

7

In context, the question was about handling bleach, which is corrosive and irritant.

Where did you get the gas mask stuff from? I haven't learnt that. I mean even if we take your answer, the mask will only protect you, what about the surrounding environment?

Original post by EditedRhyme

Not really, its actually wear a gas mask because chlorine gas is toxic. Nothing to do with corrosivity

(edited 4 years ago)

Reply 43

joejoeeames

12

I did exactly that "fill burette below eye level". it was a sneaky question about titrations

Original post by Kate23456712

Isaid the same things......not sure if saftey Goggles is the right answer as I said the burette or the equipment mentioned in that question must be below eye level..........why is nitrogen oxide produced?

What did you all ok for the disadvantage?

Reply 44

joejoeeames

12

you could say something like --> nitrous oxides dissolve into the water in atmosphere forming dilute nitric acid causing acid rain that can affect soil acidity levels and therefore kill wildlife

Original post by Kate23456712

Isaid the same things......not sure if saftey Goggles is the right answer as I said the burette or the equipment mentioned in that question must be below eye level..........why is nitrogen oxide produced?

What did you all ok for the disadvantage?

Reply 45

nerddddo

4

expected grade boundaries?

Reply 46

LiamGor

12

was the titration question the last question because i don’t remember seeing titration and im panicking now oH gOd

Reply 47

NebularCortex

10

What corrosive... it’s fume cupboard

Reply 48

joejoeeames

12

No No No. RELAX. There was no official question on a Titration, but the experiment was to find concentrations and it involved an Acid and an Alkaline. You will do absolutely fine if you write any relevant safety precautions to do with acids --> I just wrote one specifically about titrations

Original post by LiamGor

was the titration question the last question because i don’t remember seeing titration and im panicking now oH gOd

Reply 49

LiamGor

12

thank you so much !!

Original post by joejoeeames

No No No. RELAX. There was no official question on a Titration, but the experiment was to find concentrations and it involved an Acid and an Alkaline. You will do absolutely fine if you write any relevant safety precautions to do with acids --> I just wrote one specifically about titrations

Reply 50

nerddddo

4

the mole calculations was the last one so yes titration was the last one

Original post by LiamGor

was the titration question the last question because i don’t remember seeing titration and im panicking now oH gOd

Reply 51

joejoeeames

12

I personally suspect:
if the first paper was nice and the second paper was ok then I'm guessing somewhere around 85% for a 9 as a conservative guess

Original post by nerddddo

expected grade boundaries?

Reply 52

Roynull

8

What was alloy one answer?
And why air must be prevented from fermentation??

Reply 53

mg45

10

just to check wat was the mass number in the very first question, the question about the energy in an exothermic reaction like where it said refer to bond breaking and making, definition of a fuel and why fermentation doesn't need oxygen

Reply 54

joejoeeames

12

Original post by NebularCortex

What corrosive... it’s fume cupboard

Yes, this is correct as it produces toxic Chlorine Gas, but you could also put general safety precautions regarding strong acids and alkalis like DoNt PoUr ThAt **** oN yOuR FaCe

seems fair

What did everyone get in titration... it was immediately before the Mole question

Reply 57

joejoeeames

12

1. make sure you added up all the protons and neutrons: I think it was about 13.
2. bond breaking = an endothermic process and bond making = exothermic process. Less energy USED to break bonds, but more energy RELEASED when making them (hence -VE enthalpy change) therefore the reaction is exothermic
3. for fuel, I kinda guessed and put a substance that can be combusted in order to harvest energy from it
4. fermentation w/o oxygen produces ethanol and CO2. aerobic respiration with oxygen would only produce CO2 and water. Plus... if you leave the produced ethanol exposed to the air it could oxidise via microbial oxidation and become ethanoic acid

Original post by mg45

just to check wat was the mass number in the very first question, the question about the energy in an exothermic reaction like where it said refer to bond breaking and making, definition of a fuel and why fermentation doesn't need oxygen

Reply 58

LiamGor

12

yea i did the last question i was just panicking that there was like a proper titration based question with having to write steps. but thanks for replying, i was just a bit mixed up

Original post by nerddddo

the mole calculations was the last one so yes titration was the last one

Reply 59

joejoeeames

12

Alloy Thingy:
the Mixture if different sized atoms in aluminiums crystalline structure cause it to be warped --> therefore the layers of atoms become more difficult to slide over each other, therefore making the material stronger and less malleable

Original post by Roynull

What was alloy one answer?
And why air must be prevented from fermentation??

Edexcel IGCSE Chemistry Paper 2C-4CH1 12th June 2019

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