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Author Topic: 2010 VCAA Chemistry U4 Suggested solutions  (Read 32856 times)  Share 

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Mao

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2010 VCAA Chemistry U4 Suggested solutions
« on: November 11, 2010, 01:16:04 pm »
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Here's the blank paper. and the suggested solutions. Please contact me if I have made any mistakes.

Big thanks to my high school chem teacher. And anyone who help me find wrong answers :P

Quote from: vexx on November 11, 2010, 03:42:27 pm
Ammonia

a)i) 3H2 + N2 <--> 2NH3
ii) porous iron catalyst (Fe2O3)
iii) provides an alternate pathway with lower activation energy for the reaction to take place,
b)i)highly corrosive, toxic gas
ii) burns skin, lungs, etc...
iii) wearing protective equipment, ventilation
« Last Edit: November 11, 2010, 03:43:19 pm by Mao »
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10weid

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Re: 2010 VCAA Chemistry U4 Suggested solutions
« Reply #1 on: November 11, 2010, 03:22:23 pm »
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pretty sure 4 is A...both the forward and backward reactrions decrease singificantly in rate..
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minilunchbox

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Re: 2010 VCAA Chemistry U4 Suggested solutions
« Reply #2 on: November 11, 2010, 03:24:13 pm »
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Oh god, to download or not to download.
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Re: 2010 VCAA Chemistry U4 Suggested solutions
« Reply #3 on: November 11, 2010, 03:24:41 pm »
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Quote from: minilunchbox on November 11, 2010, 03:24:13 pm
Oh god, to download or not to download.

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10weid

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Re: 2010 VCAA Chemistry U4 Suggested solutions
« Reply #4 on: November 11, 2010, 03:25:22 pm »
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also pretty sure 8 is A, dilution decreases ocncentration of all ions - just because hydronium ion conc decresases doesnt necessarily mean OH- increases...
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z1m2v3

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Re: 2010 VCAA Chemistry U4 Suggested solutions
« Reply #5 on: November 11, 2010, 03:25:43 pm »
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yeah i think 4 is A
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Studyinghard

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Re: 2010 VCAA Chemistry U4 Suggested solutions
« Reply #6 on: November 11, 2010, 03:26:04 pm »
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WHAT IS HAPPENING. all these different answers to what we thought at first? :S
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10weid

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Re: 2010 VCAA Chemistry U4 Suggested solutions
« Reply #7 on: November 11, 2010, 03:26:51 pm »
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ur combustion reaction of benzoic is wrong as well..
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10weid

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Re: 2010 VCAA Chemistry U4 Suggested solutions
« Reply #8 on: November 11, 2010, 03:29:01 pm »
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also catalyst foro sulfuric is vanadium pentoxide..
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VeryCrazyEdu.

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Re: 2010 VCAA Chemistry U4 Suggested solutions
« Reply #9 on: November 11, 2010, 03:29:28 pm »
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and H2 combusts in the data book at 286 kJ/mol not 289...
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Souljette_93

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Re: 2010 VCAA Chemistry U4 Suggested solutions
« Reply #10 on: November 11, 2010, 03:29:36 pm »
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Mao, there is an error in Q's 2.1.b ii) The combustion is -286 Kj/mol, not 289


Also for the chosen chemical only sulfuric acid is given  :( , wouldn't you know of Ammonia as well?
« Last Edit: November 11, 2010, 03:32:42 pm by Souljette_93 »
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mustafa

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Re: 2010 VCAA Chemistry U4 Suggested solutions
« Reply #11 on: November 11, 2010, 03:30:19 pm »
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Quote from: 10weid on November 11, 2010, 03:25:22 pm
also pretty sure 8 is A, dilution decreases ocncentration of all ions - just because hydronium ion conc decresases doesnt necessarily mean OH- increases...

dilution increases OH concentration as there is a higher concentration of OH in water than in acid. Therefore, OH increases. BTW, unless temperature is changed, ANY change in one ion concentration is iversely proportional to the change in the other ion concentration in order to satisfy the [OH][H3O]=10^-14 rule.
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ckg93

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Re: 2010 VCAA Chemistry U4 Suggested solutions
« Reply #12 on: November 11, 2010, 03:30:45 pm »
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Multi choice 16 is C <<<sorry put it wrong first time.

The oxygen's in D don't balance.
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Souljette_93

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Re: 2010 VCAA Chemistry U4 Suggested solutions
« Reply #13 on: November 11, 2010, 03:30:56 pm »
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Quote from: 10weid on November 11, 2010, 03:25:22 pm
also pretty sure 8 is A, dilution decreases ocncentration of all ions - just because hydronium ion conc decresases doesnt necessarily mean OH- increases...

Why not? I always thought if one increases, the other decreases.
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z1m2v3

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Re: 2010 VCAA Chemistry U4 Suggested solutions
« Reply #14 on: November 11, 2010, 03:31:22 pm »
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also isnt question 16 C instead of D?
D is not balanced (there are 2 oxygen molecules on the left and 3 on the right)
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