Edexcel IAL, Unit 5: Transition Metals and Organic Nitrogen Chemistry. 22-Jun-2016

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Alright guys. My plan for tommorow is to do all the electrochemical and redox chemistry questions in my past paper book. Ill be referring my tut in questions which I get stuck and im planning to finish as much as possible by tommorow.
What do you guys think?

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Good idea!!

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Reply 21

therecovery

thanks guys <3
its a good practice. im going to do this for all subjects.
but for the ial papers i wont do this strat.
instead, ill do the entire paper

Reply 22

Ayman!

Original post by thymolphthalein

I did the exams last year. :smile:

Dropping by to post some notes I made back then. Hopefully, they're of some help.

Unit 5:
https://drive.google.com/open?id=0BwBWX8dVcLhpfnF0WmN1anVtaERzbmRJckp3c0NfbHZSNFdrRDgzQm9IVzZHYlhVeHRxQWc

Since U5 is synoptic, I also included organic/inorganic tests from AS.

These are AMAZING. I hope you got the grade you deserved.

Reply 23

Kamran Fazal

Original post by thymolphthalein

i did the exams last year. :smile:

dropping by to post some notes i made back then. Hopefully, they're of some help.

Unit 5:
https://drive.google.com/open?id=0bwbwx8dvclhpfnf0wmn1anvtaerzbmrjckp3c0nfbhzsnfdrrdgzqm9ivzzhylhvehrxqwc

since u5 is synoptic, i also included organic/inorganic tests from as.

ty so much!!

Reply 24

therecovery

Original post by thymolphthalein

I did the exams last year. :smile:

sank yew :3

Reply 25

therecovery

guys, i have a few questions:questions related to the dichromate(VI) breath analyzer:

1)If a current is caused, how does it occur?
2) Is an ammeter present in the analyzer?
3) why is the method inaccurate?

questions related to fuel cell breath analyzer

1) why is it more accurate compared to dichromate analyzer?
2) why does it contain many errors?

can someone explain to me how a infrared breath analyzer works?thanks ^.^

Reply 26

PlayerBB

1)If a current is caused, how does it occur? Current doesn't occur, in this breathalyser, there is potassium dichromate, with sulfuric acid on a silicon metal, so when a person who drank alcohol breath in the sealed tube, ethanol from the breath will react with dichromate ions and is oxidised to ethanoic acid while the dichromate ions are reduced to Cr3+
2) Is an ammeter present in the analyzer? No

3) why is the method inaccurate?
Because the dichromate ions crystals who are reduced to Cr3+ ions crystals have changed colour, the crystals have changed colour from orange to green ( not all the crystals, just the amount reduced) so we measure the length of the crystals to estimate the conc of ethanol found so it's inaccurate
questions related to fuel cell breath analyzer

1) why is it more accurate compared to dichromate analyzer? Because there is a voltage value that tells you about the conc of ethanol which is much more accurate than measuring the length of crystals

2) why does it contain many errors? It doesn't produce a printout for the results so it cannot bs used as an evidence in court so that's why the alcoholic person who appears his ethanol conc in breath is above the limit is taken to the police station to take the breath test again but this time, the breath is entered IR spectrum

can someone explain to me how a infrared breath analyzer works? The person breaths into IR spectrum and the results are printed out immediately. From the printout which shows the transmission of each bond with it's wavelength. We see the transmission of C-H bond, the higher the transmission, the more ethanol found

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(edited 8 years ago)

Reply 27

C0balt

does a thread exist for normal A level not IAL

Reply 28

PlayerBB

Original post by C0balt

does a thread exist for normal A level not IAL

I guess no

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Reply 29

therecovery

Original post by C0balt

does a thread exist for normal A level not IAL

you can still post doubts, you know.

*deleted*

Original post by therecovery

you can still post doubts, you know.

Nah I don't have any doubts, I was just wondering for post exam chat and things

Reply 32

Econ/Chem/FMaths

Hey, revising Transition metals/ Inorganic right now.
Was wandering what colour [Cr (H20)6]3+ is.
Is is Green or Ruby?
Book says Green and Chem revise says both Ruby and Green. Are both fine?
Hope the chef revisions going well. What do you guys need to get into your firm?

Reply 33

Mehodax

It's definitely Green!
Forget the Chem revise suggestion of Ruby. :biggrin:

The Transition Metals can get confusing at times, even while revising!
Chef revisions? :K:

Reply 34

Econ/Chem/FMaths

Chem* i was tired :colondollar:

Reply 35

DonPedrodoc

Hey guys, I just wanted to ask where is everyone with their revision. I've just finished my notes and hope to read through them then start past papers soon. Am i behind?

Reply 36

Ayman!

Original post by DonPedrodoc

Hey guys, I just wanted to ask where is everyone with their revision. I've just finished my notes and hope to read through them then start past papers soon. Am i behind?

Nope! I've only done 2-3 Unit 5 past papers so you're alright.

Reply 37

PlayerBB

Original post by DonPedrodoc

Hey guys, I just wanted to ask where is everyone with their revision. I've just finished my notes and hope to read through them then start past papers soon. Am i behind?

Yeah you're alright, I am still finishing my notes and I have to read through them then start past papers

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Reply 38

Mehodax

Original post by DonPedrodoc

Hey guys, I just wanted to ask where is everyone with their revision. I've just finished my notes and hope to read through them then start past papers soon. Am i behind?

I would highly recommend you to start doing past papers ASAP!
Refer your notes when required and they will start making sense.

You'll remember the notes, you've already made, better this way too :wink:

Reply 39

Tomasio

What are people finding to be the hardest topic in chem5?
IMO T metals are just horrible, so damn fiddly and so much stuff to learn....
Am finding other topics such as REDOX pretty easy though tbh