this peak is followed by a near-linear decline until B reaches zero and the last product -ethanol metabolized into acetaldehyde -is the sole remaining chemical species(of course, in the body the process continues , but here we are focusing on the first two steps) because we are mixing first -and zeroth-order kinetice,the shapes of the plots and the relative positions of the maxima will depend on the initial amount as well as the exact value of the rate constants