The gas phase decomposition of nitrogen dioxide at 383 °C NO2(g) --> NO(g) + ½ O2(g) is second order in NO2 with a rate constant of 0.540 M-1 s-1. If the initial concentration of NO2 is 0.355 M, the concentration of NO2 will be M after 15.9 seconds have passed.

What stress will shift the following equilibrium system to the left? n2(g) + 3h2(g) ⇌ 2nh3(g) adding more n2(g) adding more nh3(g) increasing the pressure of the system reducing the volume of the container

Compare and contrast physical changes with chemical changes.

The small bags of silica gel you often see in a new shoe box are placed there to control humidity. despite its name, silica gel is a solid. it is a chemically inert, highly porous, amorphous form of sio2. because water vapor readily adsorbs onto the surface of silica gel, it acts as a desiccant. despite not knowing mechanistic details of the adsorption of water onto silica gel, from the information provided you should be able to make an educated guess about the thermodynamic characteristics of the process. predict the signs for δg, δh, and δs for the adsorption of water.