yeh i also x by 2 lucky ayechampo14 said:Haha, nice one. Did you mean the Haber process one?
I thought the exam was pretty good, and I got most of the calculations.
Did everyone multiply by 2 in the Sulfuric acid one? (Because it's diprotic)
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yeh i also x by 2 lucky ayechampo14 said:Haha, nice one. Did you mean the Haber process one?
I thought the exam was pretty good, and I got most of the calculations.
Did everyone multiply by 2 in the Sulfuric acid one? (Because it's diprotic)
But it's 'on the choice of metals'.anniea89 said:Yep. I did wood (but I said it wasn't metal) Iron and steel.
Why did they ahve question on car batteries? We did nothing on car batteries!!!
joshuajspence said:yeah we just had to draw the structural formula in the box aye?
Yeah I did that for sulfuric too. The questions after that confused me though. A lot. I ended up saying add 20mL of NaOH because somehow I ended up with that number and I was not going to get anything else so I decided to at least write something down. Can't remember what I put for the middle question.Forbidden. said:But it's 'on the choice of metals'.
As for batteries the question aims to assess your understanding of oxidation-reduction reactions and obviously a car battery does undergo one.
EDIT:
Yes I multiplied by 2 for the diprotic nature of sulfuric acid. Then got confused with the dilution one. I either got 3mL or 6mL.
Not dilution I mean neutralisation.Fish Sauce said:Yeah I did that for sulfuric too. The questions after that confused me though. A lot. I ended up saying add 20mL of NaOH because somehow I ended up with that number and I was not going to get anything else so I decided to at least write something down. Can't remember what I put for the middle question.
I also completely screwed the question with the four bottles of solution. Oh man.
I agree with the first part.twilight1412 said:alot easier than last years i must say =)
and yes the first answer was ethanol =)
Yeah I was a little annoyed at that but I think I got the equation right and I said convenience and reliability for the second part (plus one word about the environment just in case). The second part was common sense really. The first part took me a little while but is the equation:blackbetty69 said:i know there was a few people angry about the battery question. cuz the syllabus says you either have to know lead acid OR dry cell and one other of your choosing.
that said, the question was hardly rocket science, its not like you had to know any equations. the second part was easy as well. why is it good that it last several years? environmental reasons and reliability of cars (i.e you won't get stuck out bush given that it operates the startermotor)
They didn't ask for wood.anniea89 said:Shitwrecks: I realise that but it was referring to the shanges in the construction of vessels over time. And wood was the first material used.
Graphite is indeed inert.Forbidden. said:They didn't ask for wood.
EDIT:
Also Graphite is inert, it better be.
Some people (not here on BoS) found the exam kind of difficult too.dietjelly said:hey everyone, thought chemistry was far more difficult than last year
was so prepared so it was a little disappointing
shipwrecks!Forbidden. said:Any shitwreckers here ?
I mentioned copper, cathodic protection and stainless steel as part of my response to the 6-mark question.
EDIT:
My chemist is a forensic chemist who analyses evidence from a crime scene (blood, semen ...) and deduces information from it. He will use analytical chemistry and use chemical principles such as chromotography to separate substances of similar chemical and physical properties and electrophoresis as biological molecules are charged and can be migrated in an electric field.
I did not name mine because it didn't ask for a name probably and I didn't have one in the first place.
you had to mention that wooden vessels were firstly built with some sort of metal ie copper in nails...then due to the changing attitudes about the corrosion in the ocean they started to find other metals which corroded less..then i tlked about sulfate reducing bacteria and finally steel which is used today and the different types of steel i.e structural etc.anniea89 said:Shitwrecks: I realise that but it was referring to the shanges in the construction of vessels over time. And wood was the first material used.
The question focused more on improvements to prevent problems with corrosion not fix the problem with corrosions after it happened.bmwz4 said:shipwrecks!
erm i wrote about cathiodic protection and galvanising...structure of steel...the types of environments including sulfate reducing bacteria, low oxygen and acidity...yer btw whats the purpose of using the graphite electrode i put so it doesnt interfere with the reaction and cause its inert...i dno? is that right...and the petri dish was C which resisted corrosion
I wrote how limpets and barnacles don't like copper sheets on ships as my first point in the 6-marker.bmwz4 said:you had to mention that wooden vessels were firstly built with some sort of metal ie copper in nails...then due to the changing attitudes about the corrosion in the ocean they started to find other metals which corroded less..then i tlked about sulfate reducing bacteria and finally steel which is used today and the different types of steel i.e structural etc.