2009 Chemistry Unit 3 Exam Questions and Suggested Solutions

[hyperblade01]

Taken from the FAQ in the chemistry section

Significant figures and states
Every paper has 1 mark for significant figures, and 1 mark for states. This means you can only lose 1 mark maximum, due to incorrectly doing your significant figures or states, but for those seeking to obtain these marks - don't fret. They only check one question to decide whether you pick up the mark or not. It is usually indicated by the question that says "express your answer to the appropriate number of significant figures" or "show all states." That will be the question they check for states, and they won't care about anything else, unless you state absurd amounts of significant figures.

Short Answer 3 b) stated give correct sig fig,  so maybe you won't be penalised?

[simpak]

The one that said express your answer to the correct sig figs I got right   Yet screwed up others.
I hope it's okay.

[mongyiu]

I totally failed omg that was so stupid it was soo fukn hard

[simpak]

Just realised maybe environment isnt the right word, too much NMR in my mind lol

But yea, the 3 methyl groups , whichever one you place the Cl on the molecule is gonna be named the same

But it shouldn't, should it?
If you put the chlorine on the first carbon, then it will be 1-choloro 2-dimethyl butane.
But if you put it on the 'last' carbon, then it will be 1-chloro 3-dimethyl butane?
If you put it on the carbon slotted in the middle, then it would be 2-chloro 3-methyl butane?
Or can you not put the chlorine on the methyl groups?

Argh I am probably missing something entirely.  I never do too well with those sorts of questions.

Oh my god!  I just got it, right then >.<
Oops!  Nevermind.

[Ilovemathsmeth]

this exam doesn't look too bad. most students should have found it quite accessible.

Accessible, yes. But to finish with confidence, hell no.

if you had practiced enough, there should not have been any retarding force to prevent you from completing the exam with great prose.

LOL a little hard under exam conditions, even if you had done about 30 practice exams...

[tdavo23]

guys guys guys....Here's one for you..........
Put jellyfish in a bowl of acid and as it basic (place vinegar and the wound to neutalise sting) it should react with the acid.
The questions that i pose to you:
Would this be an acid-base reaction?
And secondly if yes What salt would be produced?

[roly182]

The exam questions were pretty easy but it did seem very long

[NE2000]

btw, which one was the states question? Isn't that normally an equation worth two marks?

[ayaz]

i know this may sound stupid but if i could only get 14/73 what might be my letter grade???

[simpak]

D?

[ericlambers]

hi

[TrueTears]

hi

Wrong place to post, introduce yourself here: http://vcenotes.com/forum/index.php/topic,6.555.html

[lukeperry91]

hi

Wrong place to post, introduce yourself here: http://vcenotes.com/forum/index.php/topic,6.555.html

What a warm welcome.

[Mao]

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