The activation energy for the reaction between methane and chlorine at room temperature is high.
Activation energy refers to the energy required to overcome the energy barrier between reactants and products. In order words, it is the minimum energy that reactant particles must posses in order for their collision to result in a chemical reaction.
The activation energy for the reaction between methane and chlorine at room temperature is high. Hence, the reaction does not take place unless energy is supplied to the system in form of a spark, UV light or heat.
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