any example of a chemical reaction of a non spontaneous process

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Any chemical reaction (phase change, change in color that isn't natural, change in temperature that is not natural, and the formation of bubbles) that would not occur without the use of an external source is non spontaneous. Water does not evaporate at zero Celsius so it is a non spontaneous reaction. Any reaction that is spontaneous has a non spontaneous reverse reaction. Take for example Fe (iron) that rusts (gets oxidized) when exposed to oxygen, this is a spontaneous reaction because no external force had to cause the iron to rust. It occurred spontaneously. However, rusted (oxidized) iron will not return to its solid (non rusted) form without the exposure of specific chemicals (an external force); therefore, rusted iron is non spontaneous in regards to returning into solid iron.Does that help? Have a nice day.