Weegy: Organic protein catalysts are precipitates. FALSE. User: Why is activation energy required to start some reactions? to break the bonds of an endothermic reaction to overcome electron repulsion of an endothermic reaction to overcome electron repulsion of an exothermic reaction to provide sufficient energy to keep a reaction going Weegy: Activation energy required to start some reactions because - To provide sufficient energy to keep a reaction going. User: Each particular chemical reaction cannot be expected to occur at identical rates. True False Weegy: Each particular chemical reaction cannot be expected to occur at identical rates. TRUE. User: Chemical reactions can be detected by the formation of a gas. True False (More)