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HSC Chemistry Question Thread
RACHEL1111:
Hi!
Could anyone help me with this confusion : when the volume of the equilibrium reaction increases, would there be a sudden drop of the curve representing concentration of chemical species in the concentration vs. time graph? or the concentration just slowly increases or decrease?
I saw these two different versions on different textbooks and it really confuses me. Any help is appreciated!!
Hawraa:
--- Quote from: RACHEL1111 on November 05, 2019, 11:22:26 pm ---Hi!
Could anyone help me with this confusion : when the volume of the equilibrium reaction increases, would there be a sudden drop of the curve representing concentration of chemical species in the concentration vs. time graph? or the concentration just slowly increases or decrease?
I saw these two different versions on different textbooks and it really confuses me. Any help is appreciated!!
--- End quote ---
Hey,
When the volume of the vessel increase then the pressure decrease, therefore, the concentration of the species decreases represnted by a sharp decrease on the graph. I've seen this also in some past papers sample answers. Check 2009 Q23 and also 2005 Q27(this one is the other case with reduced volume).
Hope this clarifies the confusion.
RACHEL1111:
--- Quote from: Hawraa on November 05, 2019, 11:54:34 pm ---Hey,
When the volume of the vessel increase then the pressure decrease, therefore, the concentration of the species decreases represnted by a sharp decrease on the graph. I've seen this also in some past papers sample answers. Check 2009 Q23 and also 2005 Q27(this one is the other case with reduced volume).
Hope this clarifies the confusion.
--- End quote ---
Yes! It does! Thank you very much!
Hawraa:
Hi everyone,
Just regarding this graph question from ATAR Notes chemistry topic test. So it says that the trend line(line of best fit) should not be linear but should go near most points. For me it looks like the dotted line has been connected by hand. Is it wrong to draw it with a ruler ( like I did, if you can see the line in the middle) because I'm confused. My teacher said it should be linear but the answer here says it should not. So do we connect the dots or just draw a line approximately through them.
Can someone please explain this to me? Thanks.
Hawraa:
Hi everyone,
Urgent question please.
Ethanol is widely used fuel that can be made from both renewable and non renewable resources. Using relevant chemical equations, outline two methods that can be used to produce Ethanol.
The methods I would use are fermentation (equation of glucose turning into Ethanol and CO2) and hydration of ethene. Is the second method wrong? Because the answer I have talks about fermentation and the substitution of halogenated alkanes with water? Are they both correct?
Any help would be appreciated guys, thanks.
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