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Chapter 9: Rate Processes in Chemical Reactions

Re: Chapter 9: Rate Processes in Chemical Reactions

Postby goldstanda3269 » Tue Sep 03, 2019 11:32 pm

brad.willo2670 wrote:Differential vs Integrated rate laws:

To this point I have had minimal issue with these kinds of questions but something has just confused me regarding the graphing of these laws.

Example 1st order reaction:
Differential equation - rate = k(x)
Integrated equation - ln(X)t = -kt + ln(x)o

My question: is the differential equation ever graphed, or is it always the integrated equation? The integrated equation providing concentration vs time graph.
I have never seen 'rate' on an axis which is what came to confuse me. Does the differential equation simply provide a representation of the relationship of the concentration to the rate as opposed to something that would be directly graphed?

Thanks in advance!


Any mathematical relationship can be graphed. It's just that some graphs are more useful for science than others.

It is definitely within the purview of the GAMSAT that you should be able to be flexible enough to consider what a graph, that you have never seen, should look like (more or less). For example, knowing that y = mx + c is the equation of a straight line, then given rate = k(x), we can confidently say that a graph of rate vs concentration (x) is a straight line with positive slope which intersects the y axis at point 0 (the y intercept).
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Re: Chapter 9: Rate Processes in Chemical Reactions

Postby horbowiec.7527 » Sun Jun 27, 2021 6:17 pm

This is regarding GEN CHM Chapter 9 Worked solutions for Q7 (CHM-224):

Just to confirm there is a typo in worked solutions as it states answer D is correct not C.
Could you confirm please that Answer C is correct for Q7?

Regards,
Ania
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Re: Chapter 9: Rate Processes in Chemical Reactions

Postby goldstanda3269 » Sun Jun 27, 2021 10:32 pm

horbowiec.7527 wrote:This is regarding GEN CHM Chapter 9 Worked solutions for Q7 (CHM-224):

Just to confirm there is a typo in worked solutions as it states answer D is correct not C.
Could you confirm please that Answer C is correct for Q7?


It's a trap!

Answer choice C is a correct statement. However, the question states "not" which means that we are looking for the incorrect statement. Answer choice D is indeed correct because it has an incorrect statement.
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Re: Chapter 9: Rate Processes in Chemical Reactions

Postby horbowiec.7527 » Mon Jun 28, 2021 11:43 am

Thank you for that, so easy to make a mistake if you're not paying attention!

This is regarding Q24 for GEN CHM Chapter 9: there is no explanation in worked solution for this question, could you add it on please?

Ania
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Re: Chapter 9: Rate Processes in Chemical Reactions

Postby horbowiec.7527 » Mon Jun 28, 2021 4:19 pm

This is regarding GEN CHM Chapter 9 Worked solution for Question 30 (CHM-231):

Could you please kindly offer some additional explanation for this graph and why answer D was chosen. I can't understand it exactly based only on the tables provided in worked solutions.

Regards,
Ania
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Re: Chapter 9: Rate Processes in Chemical Reactions

Postby goldstanda3269 » Tue Jun 29, 2021 8:25 pm

Please re-check Q24 and Q30 worked solutions in 24 hours.
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