
type  reaction  rate
 null order  X_{2}(R) > X_{1}(P)  dP = kdt (until [X_{2}]=0)
 first order  X_{1}(R) > X_{2}(P)  dR = kRdt
 second order  X_{1}(R) > X_{2}(P)  dR = kR^{2}dt
 third order  X_{1}(R) + X_{2}(R) + X_{3}(R) > X_{4}(P)  dP = kR_{1}R_{2}R_{3}dt
 opposed  X_{1}(R) <> X_{2}(P)  dX_{1}/dt = k_{2}X_{2}k_{1}X_{1} dX_{2}/dt = k_{1}X_{1}k_{2}X_{2}
 consecutive  X_{1}(R) > X_{2}(P) X_{2}(R) > X_{3}(P)  dX_{2}/dt = k_{1,2}X_{1}k_{2,3}X_{2} dX_{1}/dt = k_{1,2}X_{1} dX_{3}/dt = k_{2,3}X_{2}
 parallel  X_{1}(R) > X_{2}(P) X_{1}(R) > X_{3}(P)  dX_{1}/dt = k_{1,2}X_{1}k_{1,3}X_{1} dX_{2}/dt = k_{1,2}X_{1} dX_{3}/dt = k_{2,3}X_{1}

