Thermochemistry Vocabulary

3. eactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products.
4. a thermodynamic quantity equivalent to the total heat content of a system. It is equal to the internal energy of the system plus the product of pressure and volume.
6. The law of conservation of energy states that energy can neither be created nor destroyed - only converted from one form of energy to another.
9. a unit of energy equivalent to the heat energy needed to raise the temperature of 1 gram of water by 1 °C (now often defined as equal to 4.1868 joules).
10. an apparatus for measuring the amount of heat involved in a chemical reaction or other process.
11. The heat of reaction is the energy that is released or absorbed when chemicals are transformed in a chemical reaction. It describes the change of the energy content when reactants are converted into products.

1. is a thermodynamic process or reaction that releases energy from the system to its surroundings, usually in the form of heat, but also in a form of light (e.g. a spark, flame, or flash), electricity (e.g. a battery), or sound (e.g. explosion heard when burning hydrogen).
2. the energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors.
5. each of two or more different physical forms in which an element can exist. Graphite, charcoal, and diamond are all allotropes of carbon.
7. the degree or intensity of heat present in a substance or object, especially as expressed according to a comparative scale and shown by a thermometer or perceived by touch.
8. the SI unit of work or energy, equal to the work done by a force of one newton when its point of application moves one meter in the direction of action of the force, equivalent to one 3600th of a watt-hour.