1. Gravitational Potential Energy is determined by and
The higher the object, the
its potential
energy. The greater the mass, the
the potential energy.
2. Elastic Potential Energy is the energy
in elastic materials from
stretching or
The more
the more
stored
3. The faster an object
the
its kinetic energy.
4. The
the mass of an object, the greater the kinetic energy.
5. Energy can be transformed from
to kinetic energy.

when the pressure is increased, there will be a shift to the reactants side. decreasing the volume will increase pressure. when you decrease the volume, the gaseous species get more tightly packed of the concentrations of gaseous species increase.

le chatelier's principle says that the system wants to undo this concentration increase so it can decrease pressure.

since the reactants only have 1 mol of gas (only pcl5) and the products have 2 mol of gas (both pcl3 and cl2), it shifts to reactants to decrease concentration, thereby lowering the pressure