Describe a time when it was difficult to be objective

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

What is the independent variable in this investigation? mass volume sample number substance density

Which description best characterizes the motion of particles in a solid?