Effects of temperature and pressure on exothermic and endothermic reaction?

Answer 1

An increase in temperature favours an endothermic reaction over an exothermic one as an endothermic reaction takes in the energy from the higher temperature more easily than the exothermic reaction gives out even more energy to the surroundings. Therefore an increase in temperature increases the level of completion and viability of an endothermic reaction, and the opposite for an exothermic reaction.

An increase in pressure favours any reaction that forms fewer molecules from more molecules. It does not necessarily favour an exothermic or an endothermic reaction as it depends on the number of molecules on either side of the reaction. An endothermic reaction involves the breaking of bonds to a greater extent than an exothermic reaction, so an increase in pressure would, in a lot of cases, favour the exothermic reaction more than the endothermic reaction.

Answer 2

For an exothermic reaction, increasing temperature typically decreases the rate of the reaction due to a shift in the equilibrium favoring the reactants. In contrast, for an endothermic reaction, increasing temperature usually increases the rate of the reaction as it helps provide the necessary energy required by the reactants. Pressure changes typically have a minor effect on the rate of both exothermic and endothermic reactions, as they primarily affect the equilibrium position rather than the reaction rate.