Chemistry Energetics

2. the standard enthalpy change of ___ is the difference between the enthalpy of the products and enthalpy of reactants under standard condition.
4. the energy or heat energy content of a substance with units kJ/mol
5. the higher the enthalpy, the less ___ the substance
6. a hypothetical gas whose molecules occupy negligible space and have no interactions (5,3)
8. a positive enthalpy change shows an ___ reaction
10. any moving object possesses ___ energy
11. the enthalpy of ___ of a substance is the change in enthalpy produced when one mole of fuel is reacted with excess oxygen to produce carbon dioxide and water
15. the enthalpy of ___ is the change in enthalpy when one mole of a substance in the standard state is formed from its pure elements under the same conditions.
16. a chemical equation written with an associated change in enthalpy value (14,8)
17. the act of measuring changes in state variables of a body for the purpose of deriving the heat transfer associated with changes of its state
18. the enthalpy of ___ is the enthalpy change associated with the dissolution of a substance in a solvent at constant pressure resulting in infinite dilution
19. the minimum energy required for a reaction to occur (10,6)

1. the amount of energy required to break one mole of bonds in the gaseous state averaged across a range of compounds containing that bond (7,4,8)
3. according to ___'s law, the heat absorbed or released in a chemical process is the same, whether the process takes place in one or several steps
5. the energy required to raise the temperature of 1g of a substance by 1K (8,4,8)
7. a negative enthalpy change shows an ___ reaction
9. a theory that explains rate of reactions at a molecular level (9,6)
12. ~101.325kPa, 273K
13. the enthalpy of ___ is the change in enthalpy that occurs when one equivalent of an acid and one equivalent of a base undergo a reaction to form water and salt.
14. a substance that increases the rate of reaction without being consumed