Industrial Chem ?! (2 Viewers)

[jayy100]

Ok, for the first question of this option topic, what did you think/say 'X' was?

Whats your reasoning? LOL, was so thrown offf by this

 

[umz93]

Conc H2SO4

BTW will Industrial Chem scale well this year, considering how many people found it weird?

 

[BadMeetsEvil]

I think I wrote h2so4. Will I lose marks for not putting conc. ???

 

[umz93]

It was 3 marks, 1 mark for naming, 1 mark for explanation, 1 mark for chemical equation. So maybe/maybe not.

 

[jayy100]

damnnnnit why conc. sulfuric acid?

 

[_deloso]

Ok, for the first question of this option topic, what did you think/say 'X' was?

Whats your reasoning? LOL, was so thrown offf by this

hahaha go ahead jay100 and vent all your frustrations!

Conc H2SO4

BTW will Industrial Chem scale well this year, considering how many people found it weird?

hopefully it will!! but I heard some options were hard as well so I don't know.

 

[jayy100]

LOL, yeaah anyone care to explain?

Yeah option topics were lesss straight-foward than usual =\

 

[umz93]

Thats good, means all of chem will scale better

 

[Effekt]

The worst question i have ever seen, my Chemistry teacher said they screwed up and that it was a hard test.

 

[BadMeetsEvil]

The worst question i have ever seen, my Chemistry teacher said they screwed up and that it was a hard test.

I think it's fair to say that most exams this year is hard... Well not necessarily hard but just different from what is expected. I think you needed to actually know the concept to answer the question. eg equilibrium and titration and all them

 

[jayy100]

haha yeahh i found the option topic hard (even though, a few others found it relatively easy)

And why is it conc. sulfuric acid?!?!?! Does it act as a dehydrating agent or something, thereby removing the colour of the crystals??

 

[umz93]

I wrote dehydrating crystals but changed it to oxidising agent, FML. Hopefully i will still get 2 marks... And how the F would it be possible to write an equation for that :S

 

[RANK 1]

i just wrote the formula for copper 2 sulfate pentahydrate, i said x was atoms

 

[Georgina168]

I wrote NaOH because the crystals were an acid, so a titration type reaction happened in the container and turned the crystals blue. So the reaction needed a base.
Was just a wild guess!

 

[zhuang281]

• Sealed container suggests it was keeping something out (Moisture)
• Hydrated copper sulfate was in the bowl
• Liquid seperate from copper sulfate so it couldnt have had a major chemical reaction with the sulfate

Ie only logical possibility out of the three substances we learnt about in Industrial Chem was Conc H2SO4 dehydration reaction.

 

[b3kh1t]

I said sulfuric acid but, I had said it was concentrated sulfuric acid in water as this will boil the water and cause it to evaporate, which will then condense into the watch glass altering the colour lol

 

[Forev3r]

I showed my chem teacher the question and she said it was water?
I think shes wrong though
I was wtf all the way home that first question got me so confused Im only expecting a 17/25 I hope it aligns to 20 or something because I hear people found the other options easy....

 

[weber]

liquid x = conc. sulfuric acid
CuSO4.5H2O(s) <=> (write conc. H2SO4 where you'd write the catalyst) CuSO4(s) + 5H2O(l)
Hydrous CuSO4 is blue and conc. sulfuric acid acts as a dehydrating agent, turning the colour of the crystals from blue to white.

 

[FCB]

does it matter if we dont include states?

 

[jayy100]

liquid x = conc. sulfuric acid
CuSO4.5H2O(s) <=> (write conc. H2SO4 where you'd write the catalyst) CuSO4(s) + 5H2O(l)
Hydrous CuSO4 is blue and conc. sulfuric acid acts as a dehydrating agent, turning the colour of the crystals from blue to white.

This is exactly, 100% correct. I just looked it up: http://www.finishing.com/173/41.shtml (and also cross-referenced)
Thats not general knowledge, how did you know the whole equation + colour change??