is a thermodynamics and a major question that we want to be able to answer when thinking about thermodynamics is whether or not and how could we figure out if a reaction is spontaneous or not all right so what does a spontaneous reaction mean okay so a spontaneous reaction is a reaction that we want to rewrite this a chemical reaction that occurs without external energy so that's gonna happen it doesn't need anything any any energy to occur it's going to happen so the one in pictured here is would be the spontaneous oxidation of iron ore just basically the rusting of iron so that nice pretty car sitting there made of iron you know made of steel but steel has iron it's being is reacting with oxygen in the atmosphere and it forms fe2o3 so that happens that's happening right now to my car right now in the parking lot a little bit more than I liked but it's okay still runs good all right but that's happening plug iron plus oxygen goose fe2o3 and so we need a 2 a 3 and then a 6 a 4 for a the opposite of the spontaneous direction is a non spontaneous reaction ok so a non spontaneous reaction is not a spontaneous reaction I think that's what the non means like in front when you put the non in front of me it's not ok so that of course that would be a little bit more non spontaneous reaction is a chemical reaction that requires that has that you have to put in energy for it to go so will that rusty car in that field ever spontaneously go back to a shiny new car no okay but can you do that can you fix that car up and put it back into like new condition yeah sure but it's gonna take some energy you have to put some work into that car to do that and of course that's true for how we get iron you know we're digging up iron you mind for iron most of them and most metals you get them as minerals most of the time is oxides and we have to put a lot of energy and time into preparing them as iron or any other metal that we want so a non-spontaneous reaction doesn't mean it can't happen it just means you got to put energy into it first happens oh yeah yeah so you can you can take steps to prevent spontaneous reactions that from happening usually through like mechanical means like if you have an iron car you like keep it you know you either put some type of you know paint that protects the metal from oxygen or you know wax to prevent you know keep the basically keep the oxygen from hitting the iron and clotting yeah as if that I mean first thing for a chemical reaction to have happened you know they got to collide so if you prevent that oxygen molecule from clotting with the iron it can't oxidize it yep or you can keep or just think about kinetics what else could we do we can lower the temperature so just always keep your car cold like put ice over it like while it's outside