What best describe the location of an atom's electrons

How would doubling the made of an object change the objects potential energy

To do work, this truck uses energy stored in chemical fuel and an electrical battery. how much total energy does this truck put out?

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid