ATAR Notes: Forum
VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: dummi on May 02, 2022, 11:16:04 pm
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this from heinemann chapter 8.3 question 5 (yr 12)
I said this but im pretty sure this so wrong that
2NH = N2+3H2 (endothermic)
where the rate of the backward reaction is increased by increasing the temperature
L.C then will balance by increasing the rate of forward reaction
Thus yield will increase
Pretty dam sure this aint it ^^^^
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Hey there!
Hope all is well. This is my understanding:
If the forwards reaction is endothermic, then an increase in temp would result in:
- An increase in the rate of both the forwards and backwards reaction
- Then a partial favoring of the forwards reaction (because of L.C)
If you heat it up, it wants to cool down... meaning the endothermic (heat absorbing) reaction would be favored.
Since the temperature change doesn't affect the concentrations, then the concentration of the products should increase.
Hope this helps!
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In terms of the textbook question:
Kc is dependent on temperature. If you were to increase the temperature for an endothermic reaction, then Kc should increase as you are favoring the forwards reaction...
I think ???
Anyway, hope this helps! :)
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Hey there!
Hope all is well. This is my understanding:
If the forwards reaction is endothermic, then an increase in temp would result in:
- An increase in the rate of both the forwards and backwards reaction
- Then a partial favoring of the forwards reaction (because of L.C)
If you heat it up, it wants to cool down... meaning the endothermic (heat absorbing) reaction would be favored.
Since the temperature change doesn't affect the concentrations, then the concentration of the products should increase.
Hope this helps!
Great answer!
Both reaction rates increase, but the rate of the endothermic reaction direction increases more than the exothermic reaction direction when the temperature is increased. We can predict this using LCP.
In terms of the textbook question:
Kc is dependent on temperature. If you were to increase the temperature for an endothermic reaction, then Kc should increase as you are favoring the forwards reaction...
I think ???
Anyway, hope this helps! :)
Yes! Small note here that favouring a reaction direction isn't always reflective of a change in Kc (but rather a change in Q).
Happy to expand on this more if it doesn't fully make sense :)