Here's why:
* Le Chatelier's Principle: This principle states that if a change of condition is applied to a system in equilibrium, the system will shift in a direction that relieves the stress.
* Temperature as Stress: Increasing the temperature is a stress on the system.
* Endothermic Reactions Absorb Heat: By shifting the equilibrium towards the endothermic reaction, the system absorbs the added heat, relieving the stress caused by the temperature increase.
In summary: The reaction that absorbs heat (the endothermic reaction) is favored when the temperature is increased. This is because the system seeks to minimize the impact of the change.
