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,

thats how its supposed to be

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.