Question

Review | Constants Periodic Table Leaming Goal: To understand reaction order and rate constants. For the general equation A+B+C+ dD. the rate law is expressed as follows: ratek AB" where mand n indicate the order of the reaction with respect to each reactant and must be determined experimentally and kis the rate constant, which is specific to each reaction Order For a particular reaction, aA +bB+CD the rate law was experimentally determined to be rate - KABC -- EBC2 A. This equation is zero order with respect to A Therefore changing the concentration of A has no effect on the rate because Al will always equal 1 B. This equation is first order with respect to B This means that if the concentration of Bis doubled, the rate will double. If Bis reduced by hall, the rate will be halved. If B is tripled, the rate will triple and so on C. This equation is second order with respect to C. This means that if the concentration of Cis doubled, the rate will quadruple. It is tripled, the rate will increase by a factor of 9, and so on. Overall reaction order and rate constant units The sum of the individual orders gives the overall reaction order The example equation above is third order overall because 0+1+2-3 For the units of cate to come out to be M/s, the units of the rate constant for third-order reactions must be M-2.5 since M/s (M-2.5 (M) For a second-order reaction, the rate constant has unts of Ms because M/s (M-1.5 (M). In a first-order reaction, the rate constant has the units because M/s-(s)(M) Analyzing a specific reaction Consider the following reaction: 2M+02MgO ratek Mx0,9 Part A What is the overall reaction order? Express your answer as an integer. View Available Hints