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Chapter 9 : Rate Processes in Chemical Reactions

Chapter 9 : Rate Processes in Chemical Reactions

Postby laoise.dri8840 » Sun Feb 16, 2020 10:19 pm

With regards to the GAMSAT level MCQs available online with this chapter. Could you explain question 9 please? I didn't find the explanation on the website very clear.

Thanks
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Re: Chapter 9 : Rate Processes in Chemical Reactions

Postby goldstanda3269 » Tue Feb 18, 2020 6:18 am

The graph, as shown is the forward reaction. It goes from reactants on the left to products on the right. We can see that it is endothermic: the curve starts at +20 and ends at +40 so delta H is the difference: +20.

The activation energy goes from the start of the curve at +20 to the peak at +80 so that is +60, thus the answer is D.

A catalyzed reaction is the lower curve.

A 'reverse' reaction is the entire curve but in the reverse direction.

The best and most detailed explanation is the "Potential Energy Diagrams" video on gamsat-prep.com (it's in Chapter 9, Lessons General Chemistry; and also the same video is on the Videos page).


In future, please post in the Gold Standard GAMSAT book Chemistry section of the forum, this post will eventually be migrated.

Thanks!
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