# multipule choice answers (1 Viewer)

#### bob_the_catdog

##### New Member
EDIT: Here is a table of compiled reults: http://www.cse.unsw.edu.au/~mrla036/chemistry.htm

Note, these are not neccesarily correct, they just show the answers of those on this thread who provided answers for all 15 questions.

Last Updated: Today

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1B
2D
3B
4B
6C
7C
8A
9A
10A
11B
12D
13D
14C
15A

Last edited by a moderator:

#### hellohello

##### Member
Originally posted by bob_the_catdog

1B
2D
3B
4B
6C
7C
8A
9A
10A
11B
12D
13D
14C
15A

totally agree!!! hopefuly 15/15

bdbbdccbaabacda

#### nerdd

##### Member
for 8 i got b instead of a.
when you do -log 10 0.0005 you get 3.3....

5 is D.. teacher confirmed it.

and 13 is B

(i think teacher confirmed that too)

and 15 the teacher says is D
I PUT A THO grr

he reckons that the buffer maintains the pH but once you've used up all the buffer it drops the pH.
but hrm. according to the diagram it says the pH droped at 50mL but the soltuion was 100mL.. maybe he forgot to read that part.
so in other words, It's a? all agreed?
haha

i think i got 13 out of 15 aghh.. alright i suppose

##### New Member
hay i got the same to so hopefully ( as orignal list)

#### kazerati

##### Member
hmm... yeh, im thinkin pretty similar there..

wat was q 13??

#### fitz33

##### Member
i got exactly the same as the original list

#### phenol

##### Argonaute
15 teacher says D?

hehe

which school is this?

#### Theodosius

##### Member
8 is a, because it says assume the acid is completely ionised- ie it gives both its H's , meaning there are double the conc. .: -log10 of 0.001, giving an answer of three. Concensus in our group has 5D. 13 is definately c.

#### +:: \$i[Q]u3 ::+

same as bob.
nerdd.. sulfuric acid is diprotic.
the more active metal will go into solution.
and it's a buffer. it's A.
hmm~~~ ^^

oh shit.
haha
oh well!

#### tegs

##### Member
Yeah 15 is definitely A.
Wouldn't 13 be B? Cos the Z is least reactive cos it didn't replace the X when X was in the Z solution.

#### +:: \$i[Q]u3 ::+

the more reactive metal wil go into solution. Z is more reactive so it stays in solution. If it were less reactive than X, X would go into solution and Z metal would form.

#### ghoolz

##### New Member
1B
2D
3B
4D
5D
6C
7A
8B
9A
10A
11C
12D
13B
14A
15D

15 is D because the buffer will stay at constant pH for a while.
I forgot the diprotic acid - Damn

#### tegs

##### Member
damn damn damn.
Well it looks like I might get 10-12 out of multiple choice. That really stuffs things up.

#### kazerati

##### Member
darn diprotics...

n for 13 i put c, i think... but im having a feeling that i either read that one wrong, or read the possibilities wrong.. da, who cares?!?!? 21 hours and 33 minutes to freedom...

amen kazerati =)

#### iambored

##### dum-di-dum
Originally posted by bob_the_catdog

can;t be d because the solids are dissolved, filtering will do nothing
Originally posted by ghoolz

15 is D because the buffer will stay at constant pH for a while.
I forgot the diprotic acid - Damn
hmmm, i don't agree, i think it's a because it will stay fairly constant and then go down, i don't think it would be as sharp as d

#### Nuggy

##### New Member
15 is D... cuz, the buffer will aborb a small amount of acid before the pH decreases

i thought the MC was harder than previous years... is that the general opinion or is it just me?!

#### iambored

##### dum-di-dum
Originally posted by nerdd
5 is D.. teacher confirmed it.

and 13 is B

(i think teacher confirmed that too)

and 15 the teacher says is D
5. u sure? how do you use a filter funnel to find dissolved solids?
13.
z is more reactive than x
z is more reactive than y
x is more reactive than y
therefore... !! i put them the wrong way round, don't mind me, but u can use them to understand the question if you need to