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Edexcel IAL Chemistry Unit 3 WCH03 May June 2016 Discussion

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Original post by NNB_Herath
even i wrote anti-bumbing granules.... and water in ,... and water out


i wrote cornical granles!!! smthn from bio what the heck lool
Original post by pondsteps
wait why is that wrong , i did the same


There were square brackets as it's already explained in the other post.You have solve the brackets first BIDMAS.The correct energy value is 27### and -418 Kj/mol enthalpy change.
Original post by pondsteps
i wrote cornical granles!!! smthn from bio what the heck lool

Those are waaaay different.
Original post by OnTheHorizon
Those are waaaay different.


loool ik obv! its cos i had bio the day before so my brain was full of bio stuff
Original post by ToxicPhantom007
1st, 2nd were not valid because rounding off doesnt give a huge difference. Heat loss and incomplete comb were the valid statements


But how was the incomplete combustion one valid?? If anything, incomplete combustion would have caused soot to form on the can so the mass difference (i.e. mass of ethanol) would be lower, so the calculated value should have been higher.

What did you say as an explanation?
Original post by OnTheHorizon
There were square brackets as it's already explained in the other post.You have solve the brackets first BIDMAS.The correct energy value is 27### and -418 Kj/mol enthalpy change.


oh haha thats what i got actually
Reply 206
Avatar for Blazyy
Blazyy
3
Original post by IAROX15
But the x-axis was discrete data. How could that be a line graph?

Hmmm why are you bringing statistics into this?
The x axis should have 5 values... 1,2,3,4,5... to indicate the number of carbon atoms in a particular compound.
Original post by pondsteps
i wrote cornical granles!!! smthn from bio what the heck lool


hahahaha
CORTICAL GRANULES.... what the...
they are found in the FEMALE EGG CELL >...haha haahahahaha what the...ahaha
Original post by Blazyy
What was the test for iodine?

First I put down dilute hno3, then agn03 gives yellow ppt
But I changed it to add h2so4, purple fumes


I put alcoholic AgNO3 which should give a yellow precipitate.
Original post by Blazyy
Hmmm why are you bringing statistics into this?
The x axis should have 5 values... 1,2,3,4,5... to indicate the number of carbon atoms in a particular compound.


was that number of Carbon atoms or the number of TOTAL ATOMS
I did for number of TOTAL ATOMS
(edited 7 years ago)
Original post by Blazyy
Hmmm why are you bringing statistics into this?
The x axis should have 5 values... 1,2,3,4,5... to indicate the number of carbon atoms in a particular compound.


idk thats what I read somewhere :s-smilie:
I hope they accept both
Original post by NNB_Herath
hahahaha
CORTICAL GRANULES.... what the...
they are found in the FEMALE EGG CELL >...haha haahahahaha what the...ahaha


LOOL IK shutup :tongue:
was that number of Carbon atoms or the number of TOTAL ATOMS
I did for number of TOTAL ATOMS
Original post by IAROX15
But how was the incomplete combustion one valid?? If anything, incomplete combustion would have caused soot to form on the can so the mass difference (i.e. mass of ethanol) would be lower, so the calculated value should have been higher.

What did you say as an explanation?


Wouldn't the mass be higher as we are measuring the mass of the copper can, and so if there's soot on the bottom of it, this will make the can slightly heavier. Because we are using the mass of the copper can to find the heat energy released to then find the enthalpy change of combustion.
Original post by notsoclueless
I forgot to BALANCE !!!!!!!!!!!!!!!!!!!! :frown: :frown: :frown:


Darny darn darrn.. I didn't write K2CO3 :/ There goes two more marks :/ That's like 5+2 something gone till now :/

I thought it was a carbonate anion, so at least you get a mark :tongue: Totally forgot to take the water vapour into account
Original post by NNB_Herath
was that number of Carbon atoms or the number of TOTAL ATOMS
I did for number of TOTAL ATOMS


It was the number of carbon atoms
Original post by don't cry-craft
It was the number of carbon atoms


are you sure ???????? :frown:(((
Reply 217
Avatar for t
t
13
Do you guys remember what was the question about relating to the -OH observation?
Original post by I <3 WORK
Do you guys remember what was the question about relating to the -OH observation?


which question?
Original post by ToxicPhantom007
Anyways we still have unit 1 and 2. Best of luck everybody.
I also have Physics unit 3 tomorrow :frown:


Best of luck :biggrin:

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