How does temperature affect the rate of reaction?
For a reaction to occur particles reacting must have a neccessary activation energy (kinetic energy). As temperature gets higher, so does the kinetic energy of particles, which can be ilustrated with a Maxwell-Boltzmann distribution diagram. This means that more particles can overcome this energy and succesfully react as chances of a properly oriented collision are higher. It is sometimes said that the reaction rate doubles with a 10 degree raise in temperature.
For Higher Level Students the Arrhenius equation and graphs can be analysed to further explain the topic.
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Use the following information: [[[[2H2(g) + O2(g) → 2H2O(l) ∆H = −572 kJ mol−1]]]] [[[[2H2(g) + O2(g) → 2H2O(g) ∆H = −484 kJ mol−1]]]] to calculate the enthalpy change for the process: H2O(g) → H2O(l)