What type of chemical reactions only occur if there is an input of energy?

1 Answer
Mar 27, 2017

Answer:

In fact most chemical reactions require energy input (i.e. #"energy of activation"#) to make them go..........

Explanation:

But given the context of the question, clearly they are looking for the answer of #"endothermic reactions"#, in which the enthalpy of the PRODUCTS is greater than the enthalpy of the reactants:

#"Reactants"+Deltararr"Products"#

That is energy must be put into the reaction to enable the transformation.