Define these terms: system, surroundings, open system, closed system, isolated system, thermal energy, chemical energy, potential energy, kinetic energy, law of conservation of energy.

These terms are key concepts in physics. A system is a part of the universe under study, and its surroundings refer to everything else in the universe. An open system can exchange both mass and energy with its surroundings, a closed system can only exchange energy, and an isolated system can't exchange either. Thermal energy is the internal energy of an object due to the kinetic energy of its atoms and molecules, and chemical energy is stored in the bonds between atoms. Potential energy depends on an object's position or state, and kinetic energy depends on its motion. The law of conservation of energy states that energy cannot be created or destroyed, only transformed from one form to another.