• Want to help us with this year's BoS Trials?
    Let us know before 30 June. See this thread for details
  • Looking for HSC notes and resources?
    Check out our Notes & Resources page

Cssa Trials... (1 Viewer)

physician

Some things never change.
Joined
Oct 21, 2004
Messages
1,432
Location
Bankstown bro
Gender
Male
HSC
2005
currysauce said:
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

Member
Joined
Feb 20, 2004
Messages
525
Gender
Undisclosed
HSC
N/A
physician said:
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

physician said:
hmmmm... maybe we should have like 3 chem HSC exams....
i dont totally agree.. Lol
 

~ ReNcH ~

!<-- ?(°«°)? -->!
Joined
Sep 12, 2004
Messages
2,493
Location
/**North Shore**\
Gender
Male
HSC
2005
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

Some things never change.
Joined
Oct 21, 2004
Messages
1,432
Location
Bankstown bro
Gender
Male
HSC
2005
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

Active Member
Joined
Sep 11, 2004
Messages
1,348
yeah the last q i got 2707, but how about the pH one was the pH 2 or 1
 

physician

Some things never change.
Joined
Oct 21, 2004
Messages
1,432
Location
Bankstown bro
Gender
Male
HSC
2005
~ ReNcH ~ said:
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

Actuary in the making
Joined
Aug 31, 2004
Messages
576
Location
Sydney
Gender
Male
HSC
2005
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 ~

!<-- ?(°«°)? -->!
Joined
Sep 12, 2004
Messages
2,493
Location
/**North Shore**\
Gender
Male
HSC
2005
xrtzx said:
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

Some things never change.
Joined
Oct 21, 2004
Messages
1,432
Location
Bankstown bro
Gender
Male
HSC
2005
xrtzx said:
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

Actuary in the making
Joined
Aug 31, 2004
Messages
576
Location
Sydney
Gender
Male
HSC
2005
u guys, didn't it say how many Litres of the gas would evolve, there were 2 gases (right?)
 

~ ReNcH ~

!<-- ?(°«°)? -->!
Joined
Sep 12, 2004
Messages
2,493
Location
/**North Shore**\
Gender
Male
HSC
2005
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

Active Member
Joined
Sep 11, 2004
Messages
1,348
physician said:
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
 

physician

Some things never change.
Joined
Oct 21, 2004
Messages
1,432
Location
Bankstown bro
Gender
Male
HSC
2005
~ ReNcH ~ said:
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 ~

!<-- ?(°«°)? -->!
Joined
Sep 12, 2004
Messages
2,493
Location
/**North Shore**\
Gender
Male
HSC
2005
physician said:
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

Active Member
Joined
Sep 11, 2004
Messages
1,348
all well, that test was alrite, we have no more chem tests for 70 days yeah :)
 

~ ReNcH ~

!<-- ?(°«°)? -->!
Joined
Sep 12, 2004
Messages
2,493
Location
/**North Shore**\
Gender
Male
HSC
2005
currysauce said:
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

Actuary in the making
Joined
Aug 31, 2004
Messages
576
Location
Sydney
Gender
Male
HSC
2005
i'm calm, cuz i am happy with the rest of the exam, just not the mc
 

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

Top