Energetics Terms and Concepts

Chemistry Definition Of Terms

  1. energy: measure of the ability to do work 
  2. heat: measure of the total energy in a given amount of substance 
  3. temperature: a measure of the average kinetic energy 
  4. combustion: it is a chemical reaction that happens between a fuel and an oxidizing agent that produces energy. the energy is usually in the form of heat or light. 
  5. neutralization: it is a chemical reaction in which an acid and a base react to form a salt. 
  6. Exothermic Reaction: A reaction that releases heat to the surroundings as a result of forming products with stronger bonds than the reactants.
  7. Endothermic Reaction: A reaction that absorbs heat from the surroundings as a results of forming products with weaker bonds than the reactants.
  8. Enthalpy: The heat transferred during a reaction carried out under standard conditions

9. energy/ enthalpy level diagram: It is a diagram that illustrates the overall exothermic and endothermic reaction. These diagrams show difference in total enthalpy of both the reactants and products for a specific reaction.

  1. specific heat capacity: defined as the heat required to raise unit mass of substance by one degree of temperature. 
  2. calorimeter: it is a device for measuring enthalpy changes for reactions. 
  3. Standard Enthalpy Change Of Reaction: The heat transferred during a reaction carried out under standard conditions
  4. Standard Enthalpy Change Of Formation: The enthalpy change on the formation of one mole of a compound from its elements in their standard states under standard conditions.
  5. Standard Enthalpy Change Of Combustion: The enthalpy change on the complete combustion of one mole of the compound in its standard state in excess oxygen under standard conditions.
  6. standard enthalpy of vaporization: is the energy that must be supplied as heat at constant pressure per mole of molecules vaporized. 
  7. Bond enthalpy: The average enthalpy change of breaking a bond between gaseous atoms into its constituent gaseous atoms.


  1. http://www.memrise.com/set/10015529/ib-chemistry-hl-definitions/
  2. http://chemwiki.ucdavis.edu/Physical_Chemistry/Thermodynamics/State_Functions/Enthalpy
  3. http://en.wikibooks.org/wiki/IB_Chemistry/Definitions

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