Cssa Trials... (1 Viewer)

[physician]

yes i shrug to about 5 of the MC... but who cares, they are only worth 1 mark - big deal

It's reassuring to know u guys also had some trouble with MC... i think that was the least part i liked about the exam...

chem exams put me off.... u do all that study and then get tested on like 1/10 of what u studied... (exaggeration.. but yeh....)

hmmmm... maybe we should have like 3 chem HSC exams....

*waits for angry mob to attack*

 

[fantasy27]

chem exams put me off.... u do all that study and then get tested on like 1/10 of what u studied... (exaggeration.. but yeh....)

i totally agree

hmmmm... maybe we should have like 3 chem HSC exams....

i dont totally agree.. Lol

 

[~ ReNcH ~]

That stupid oyster q...I put 6, since I believe that regardless of the power, it would come down to 12/200...i.e. whether it was 12 x 100/200 x 10 or 12 x 10/200 x 100 etc. then the answer would have to be a power of 6...that was my reasoning but I'm still unsure as to what the answer is.

As for the last question...I got 2707. I think there were something like 30 moles of N₂H₄ used. The ratio of moles was 2:7, meaning that there were 30*3.5 moles of gas produced. Multiply that by 24.79 and you get 2707. Again, I'm not sure if I'm right though.

 

[physician]

think of it like this:

u'll have 3 exams.. each worth 100...

so in total ur exams are worth 300

that way u'd make up for ur weak pts in one exam... and as a result u'll have a way better chnace of getting higher marks...i mean losing 30 out of 100... or losing 60 out of 300?

 

[richz]

yeah the last q i got 2707, but how about the pH one was the pH 2 or 1

 

[physician]

That stupid oyster q...I put 6, since I believe that regardless of the power, it would come down to 12/200...i.e. whether it was 12 x 100/200 x 10 or 12 x 10/200 x 100 etc. then the answer would have to be a power of 6...that was my reasoning but I'm still unsure as to what the answer is.

As for the last question...I got 2707. I think there were something like 30 moles of N₂H₄ used. The ratio of moles was 2:7, meaning that there were 30*3.5 moles of gas produced. Multiply that by 24.79 and you get 2707. Again, I'm not sure if I'm right though.

I think my freind did what u did for the last question.. he also obtained 2707 as an answer

ahhh... i still have nothing against oysters

 

[currysauce]

that had me as well

i left it as 1 i think in the end, since it doesn't affect the concentration of [h+]

i dunno.... i had 2, but then changed = FUCKED EXAM

 

[~ ReNcH ~]

yeah the last q i got 2707, but how about the pH one was the pH 2 or 1

I got 2.
But I wasn't entirely sure whether or not adding the water would affect the [H⁺]...I think it does. In which case the answer is 2.

 

[physician]

yeah the last q i got 2707, but how about the pH one was the pH 2 or 1

not sure about that one either....

what did u guys get for the phenolpthalene (excuse the spelling) and methyl orange one?

 

[currysauce]

u guys, didn't it say how many Litres of the gas would evolve, there were 2 gases (right?)

 

[richz]

yeah i got 2 too, but i was thinking about 1 too.

 

[~ ReNcH ~]

Btw. Adding water doesn't affect the strength of the acid since hydrochloric acid is always completely ionised. Though I'm quite sure diluting the solution does affect the hydrogen ion concentration since there are fewer hydrogen ions per litre of water.

 

[richz]

not sure about that one either....

what did u guys get for the phenolpthalene (excuse the spelling) and methyl orange one?

i think i got b for that not really sure it was either a or b

 

[currysauce]

i dunno, the MC was so confusing

 

[physician]

I got 2.
But I wasn't entirely sure whether or not adding the water would affect the [H⁺]...I think it does. In which case the answer is 2.

yeh it does affect it... lol... but i answered .....................1

currysauce ... calm down....

 

[~ ReNcH ~]

not sure about that one either....

what did u guys get for the phenolpthalene (excuse the spelling) and methyl orange one?

I said C I think...ammonia is pink in phenol (I think that was the option). I don't think it could have been any of the rest since acids are clear in phenol and bases are pinkish.

 

[richz]

all well, that test was alrite, we have no more chem tests for 70 days yeah

 

[~ ReNcH ~]

u guys, didn't it say how many Litres of the gas would evolve, there were 2 gases (right?)

Yea...one gas + water was also released as a gas = 7 moles of gas in total.

 

[currysauce]

i'm calm, cuz i am happy with the rest of the exam, just not the mc

 

[~ ReNcH ~]

all well, that test was alrite, we have no more chem tests for 70 days yeah

More...chem's not until around the 2nd week