In this paper, the effects of thermal conductivity and chemical reaction on the magneto hydrodynamic flow of a micropolar fluid over a continuously moving stretching surface with heat source/sink are considered. The analysis accounts for thermophoresis and thermal radiation. The surface temperature is assumed to vary as a power-law temperature. The governing conservation equations of mass, momentum, angular momentum, energy and concentration are converted into a system of non-linear ordinary differential equations by means of similarity transformation. The resulting system of coupled non-linear ordinary differential equations is solved numerically. The numerical results show that the thermal boundary thickness increases as the thermal conductivity parameter S increases, while it decreases as the radiation parameter R increases. Also, it was found that the Nusselt and Sherwood numbers increase as R increases and decreases as S increases.