Question

Increased temperature increases the rate of all chemical reactions. However, increased temperature in some cases increases and in other cases decreases the proportion of product relative to unreacted starting material. Draw reaction energy diagrams for exergonic and endergonic reactions, and explain why in both cases higher temperature increase the reaction rate, but has opposite effect on proportion of product.

Answer 1

Temperature increase means increase in the "k" constant rate value, that was shown by Ahrrenius and its famous equation

K = Aexp(-E/RT)

in which an increase in temperature makes an increase in the k constant value

BUT

if we talk about equilibrium, w eneed to talks about gibbs

that is

G = H-TS

for G> 0, the reaction is NOT favorable to products

This case is when

H-TS > 0

H > TS

when we have low entropy values, highg temperatures but the heat of reaction is too high enough to make a positive G,

avoid these cases!