Question

In: Chemistry

Which statement is true when the temperature at a reaction mixture is increased? Explain? A. Temperature...

Which statement is true when the temperature at a reaction mixture is increased? Explain?

A. Temperature increases cause the equilibrium constant and final product concentrations to increase
B. A temperature increase reduces the activation energy for a reaction.
C. A temperature increase speeds up the rate of a reaction by increasing the number of collisions
D. A temperature increase increases the rates of both forward and reverse reactions.


"C" and "D" seem correct to me but the correct answer (according to the book) is "A." Why?

Solutions

Expert Solution

According to Le chatliers principle

If the temperature of a system is changed, a change in the value of Kc occurs. An increase in temperature always shifts the equilibrium in the direction of the endothermic reaction, while a temperature decrease shifts the equilibrium in the direction of the exothermic reaction. Therefore, for endothermic reactions the value of Kc increases with increasing temperature, and for exothermic reactions the value of Kc decreases with increasing temperature.

If the forward reaction is exothermic and the temperature is increased, the yield of products is decreased. If the temperature is decreased, the yield of products is increased.
    If the forward reaction is endothermic and the temperature is increased, the yield of products is increased. If the temperature is decreased, the yield of products is decreased.

from above statements one could say answer is A

queen_honey_blossom answered 2 years ago
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