How does heat affect a chemical reaction?

Question

Elena Albarran · Accepted Answer

see below

the termodinamic possibility of a chemical reaction (#Delta G#) is controlled by Gibbs' law. #Delta G = Delta H- T xx Delta S# where: #Delta H# is the difference of enthalpy between products and reagents. this difference is due to the force of the bonds, and is almostindipendent by the temperature. #Delta S# is the difference of of Entropy between products and reagents. This difference is due to the Volume of the products and of the reagents and by their aggregation state. If doesn't change the aggregation state #Delta S# is almost indipendent by the temperature. T is the absolute temperature. Hence the termodinamic possibility of a chemical reaction is due overall by the valour of the product between tempearure and the difference of entropy. If #Delta G# > 0 the reaction doesn't occurr or occurr just a little if #Delta G#< 0 the reaction occurrs if #Delta G# = 0 you have the equilibrium between reagents and products according to #Kp =e^((-Delta G)/(RT))# where Kp is the costant of equilibrium and R the universal costant of ideal gases Also if #Delta G#< 0 the reaction can no occur by cinetic problems and because a reaction canoccurr, it is necessary overcome the activation energy, that depends by the force of chemical bonds in the reactants. Speed constant is #K= K° xx e ^((-Delta Ea)/(RT))# Henceby increasing T every reaction is faster

Olivia Askew · Answer

undefined Heat affects a chemical reaction by increasing the kinetic energy of the molecules involved, which leads to more frequent and energetic collisions between reactant molecules. This increased collision frequency and energy often result in a higher reaction rate, as more successful collisions occur, leading to the formation of products. Additionally, heat can also affect the activation energy required for a reaction to proceed, making it easier for the reaction to overcome this energy barrier and proceed to completion. However, excessively high temperatures can also denature proteins, break chemical bonds, or alter the conformation of molecules, thereby inhibiting or disrupting the reaction. Therefore, the specific impact of heat on a chemical reaction depends on factors such as the nature of the reactants, the reaction mechanism, and the temperature conditions.