• 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

multipule choice answers (1 Viewer)

Nuggy

New Member
Joined
Nov 21, 2002
Messages
24
which was D for q.5?

i put the one wif the bunsen and filter

the filter is right... i'm pretty sure coz u need to remove the suspended particles first
 

iambored

dum-di-dum
Joined
Apr 27, 2003
Messages
10,862
Location
here
Gender
Undisclosed
HSC
2003
Originally posted by Nuggy
which was D for q.5?

i put the one wif the bunsen and filter

the filter is right... i'm pretty sure coz u need to remove the suspended particles first
oh! misinterpretation of the question, i hate that, i thought they meant 2 ways you could measure dissolved solids, not the two things you use to measure it once, hmmm
 

Constip8edSkunk

Joga Bonito
Joined
Apr 15, 2003
Messages
2,397
Location
Maroubra
Gender
Male
HSC
2003
Originally posted by iambored
oh! misinterpretation of the question, i hate that, i thought they meant 2 ways you could measure dissolved solids, not the two things you use to measure it once, hmmm
ah crap i did the exact same thing.... i was wondering why this q was screwed hahahahahaha...
 

underthesun

N1NJ4
Joined
Aug 10, 2002
Messages
1,781
Location
At the top of Riovanes Castle
Gender
Undisclosed
HSC
2010
B for question 13 here, but it was just random between B and D.

And i got D for question 15, and it was just random between A and D. However, i was thinking because the buffer have constant Ka (equilibrium constant), and the acid put will be taken out by the buffer to form a salt, the pH would remain constant until theres no more buffer.

Now now, don't tell me the salt would be acidic?
 

crazylilmonkee

Active Member
Joined
Aug 21, 2003
Messages
1,121
Gender
Female
HSC
2003
i dont get why 15 is def D
i said A cos buffers dont change much when acids or bases are added but it doesnt mean it says completely constant, hence the slight curve..
 
N

ND

Guest
For 15 i put A, after the buffer has been 'overcome', it wouldn't decrease linearly (at least i don't think so), let's wait for phenol or mercury.
 

t-i-m-m-y

Member
Joined
Nov 15, 2002
Messages
1,756
Gender
Male
HSC
2003
personally i think 13 is D.. cuz when u stick a more reactive metal.. it will displace it from its solution.. for example if u stick magnesium into copper sulfate.. it will decolourise and u will see stuff stuck to the magnesium...

therefore by my reasoning D
Q14 is a toss between B and C i think.. i picked C originally.. then changed it to B

i think its focusing on step 1. A burette was rinsed with water and then filled with the standard acid
 
N

ND

Guest
Originally posted by t-i-m-m-y

i think its focusing on step 1. A burette was rinsed with water and then filled with the standard acid

Also on when he rinsed the conical flask with the alkaline.
 

fitz33

Member
Joined
Sep 30, 2003
Messages
127
Gender
Undisclosed
HSC
2003
Q5 is definitely D because:
1.) you need to filter the water first to get rid of suspended solids (you only want to measure dissolved solids)
2.) you then need to evaporate the water, leaving behind the dissolved solids

Q13 is D because:
1.) metal Z is not displaced by metal X, and is therefore more reactive than X
2) X displaces metal Y and is therefore more reactive than Y
ie Z>X>Y
 

Dave85

Member
Joined
Apr 4, 2003
Messages
328
Location
Sydney
Gender
Male
HSC
2003
why is 7 c?
why is 13 not a?
why is 14 wateva the hell it is?
 
N

ND

Guest
Originally posted by Dave85
why is 7 c?
why is 13 not a?
why is 14 wateva the hell it is?
7 c) Oxides that react with bases are anhydrous oxides, and are non-metals.
13 d) If X were more reactive than Z, it would have displaced it.
14 c) Burette was rinses with water, .'. acid concentration is lower, conical flask is rinsed with base, .'. there is more base in there.
 

hipsta_jess

Up the mighty red V
Joined
May 30, 2003
Messages
5,981
Gender
Female
HSC
N/A
my answers are up in my car...cant be bothered to get them.
but i reckon i got around 10/15...coz most i knew, a few i had to guess
 

Dave85

Member
Joined
Apr 4, 2003
Messages
328
Location
Sydney
Gender
Male
HSC
2003
is x the most reactive metal since its more reactive and displaces the ions of a less active metal (Y and Z) and therefore its a??
 

underthesun

N1NJ4
Joined
Aug 10, 2002
Messages
1,781
Location
At the top of Riovanes Castle
Gender
Undisclosed
HSC
2010
13 B and 15 D foreva!!! and damn i returned my chem book today.

looks like multiple choice is getting pretty hard these days.. I like the long response better.
 

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

Top