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Potential energy is the energy an object has because of its relative position, composition, or condition. A rock at the top of a hill has more potential energy than one at the bottom. Kinetic energy is the energy of a moving object. When the rock is pushed downhill, it loses potential energy but gains kinetic energy as it moves.

Thermal energy is a form of kinetic energy that exists because atoms and molecules vibrate, even when an object appears at rest. Objects with higher thermal energy have atoms moving more vigorously and feel hot. The amount of thermal energy directly corresponds to how energetically the component atoms are moving.

Chemical energy is potential energy associated with the relative positions of electrons and nuclei in molecules. During a reaction, chemical energy converts into other forms such as light or heat. The amount of energy released or absorbed depends on the molecular structure of the reactants and products, which is central to understanding enthalpy exothermic and endothermic reactions.

The amount of energy released or absorbed in a reaction depends on the molecular structure of the reactants. For example, burning acetylene releases a large amount of energy as light, while adding sodium hydroxide to hydrochloric acid releases a smaller amount as heat. These differences reflect the distinct chemical compositions and bonding arrangements involved.

An open system allows both energy and mass to be exchanged with the surroundings. A closed system permits only energy exchange, not mass. An isolated system exchanges neither energy nor mass with its surroundings. These distinctions help chemists analyze how reactions interact with their environment.

Thermochemistry is used across multiple disciplines: food scientists determine energy content of foods, biologists study metabolic combustion in organisms, and engineers improve energy efficiency in heating, cooling, and refrigeration systems. The oil, gas, and renewable energy industries rely on thermochemical principles to develop better energy production methods.

Energy is the capacity to supply heat or do work. Work is the process of causing matter to move against an opposing force. Inflating a bicycle tire is an example of work, where air is moved against the opposing force already in the tire. Understanding work helps explain how energy transfers during chemical and physical processes.