Bearing insert material in a high temperature a 2 cm diameter sphere of ni is used as a application (500°c) in air. you are worried that the material is degrading due to reaction with air. the oxidation kinetics of the reaction: ni(s)+0.502 nio (s) is 1st order with respect to o2, and zeroth order with respect to ni. ) write an constant, the information above and be sure to indicate if its occurring on a surface or in a volume expression for the reaction rate (creation of nio), incorporating a reaction rate 2) if the pre-exponential constant (ko) is 0.055 moles. m.s1 and the activation energy (e) is 100kj/mole, compute the reaction rate constant at 500°c 3) make, relevant assumptions, and derive an function of time expression for the size (radius) of the ni sphere as 4) considering that you are in terms of radius, is left. using it in air, compute how long it will take until half of the sphere,