Predictions for Chemistry 2014 HSC? (1 Viewer)

[enigma_1]

^hi there444
Like it depends are the reactanst products gaseous or not? Coz that would determine it

 

[SuchSmallHands]

why does solubility of carbon dioxide decrease when temperature increase? I know that by increasing the temperature it favours the reactants but not sure about solubility.

When the temperature increases the endothermic reaction is favoured, so less CO2 dissolves. There's also something about particles having more kinetic energy, but just remember the LCP justification and you'll be fine (I think).

 

[Hi there444]

This thread got derailed so hard.

back on topic !

Using an example from the chemistry course, explain the importance of collaboration between individuals. 4 marks
Very similar question to my trials

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[Hi there444]

^hi there444
Like it depends are the reactanst products gaseous or not? Coz that would determine it

All gaseous

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[iStudent]

 

[SuchSmallHands]

All gaseous

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Is there a reaction equation given?

 

[Hi there444]

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How many do I get?

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[enigma_1]

All gaseous

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K can you pls label the reactants/products and what they are? Is this haber?

 

[wgy182]

When the temperature increases the endothermic reaction is favoured, so less CO2 dissolves. There's also something about particles having more kinetic energy, but just remember the LCP justification and you'll be fine (I think).

Alright, thanks!

 

[Hi there444]

Is there a reaction equation given?

Nope . It just says explain changes. Nothing given except curve. It's like 3 marks

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[faisalabdul16]

95

 

[SuchSmallHands]

This thread got derailed so hard.

back on topic !

Using an example from the chemistry course, explain the importance of collaboration between individuals. 4 marks
Very similar question to my trials

Allows for the amalgamation of specialised knowledge (eg. analytical chemist can assist a medicinal chemist in determining the purity of a drug, using techniques such as x-ray crystallography, which the medicinal chemist has synthesised. Thus, together they can use their individual skills to synthesis a pure sample for in vivo testing)
Promotes sharing and corroboration of information (eg. environmental chemists from around the world can share their data concerning oxides of sulfur and nitrogen in the atmosphere to monitor the concentrations of these substances globally)

Edit: just saw this was worth 4 marks. Can confirm I would not get 4 marks haha

 

[iStudent]

95

Close but nope

 

[enigma_1]

Nope . It just says explain changes. Nothing given except curve. It's like 3 marks

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That's a really crappy question though :/

It's definitely an increase in pressure though because all of the concentrations are increasing at once.

Would have been a better q with eqn

 

[faisalabdul16]

How many do I get?

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I'm not sure, however what they were looking for was stuff like Haber and Bosch

 

[GOsie]

30mol H2 produced. therefore 6xeq2 and 4xeq1

No mol CO= 6(12) + 4(7)
= 100mol

Is this right?

 

[iStudent]

30mol H2 produced. therefore 6xeq2 and 4xeq1

No mol CO= 6(12) + 4(7)
= 100mol

Is this right?

Yes, good job

 

[enigma_1]

How many do I get?

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hmm potentially 3-4/4 i think

Wait someone confir

 

[SuchSmallHands]

Looks to me like they have increased the amount of all of the gasses. Then, the first and third lines (top from bottom), decrease in concentration perhaps because they were both on the same side of the equation and that side had a higher number of moles, so LCP dictates that the equilibrium should shift to favour the other side, which is corroborated by the fact that the middle line increases in concentration.

 

[faisalabdul16]

100 mol! I used the 3 in front of N2 accidently