Thermochemistry

3. The value of q required to return a system to the given temperature at the completion of a reaction of Reaction
4. change in enthalpy for a reaction at a given temperature and pressure
6. quantity of heat needed to raise the temperature of the sample of substance by 1°C
9. kinetic and potential energies of the particles making up a substance
14. An extensive property of a substance that can be used to obtain the heat absorbed or evolved in a chemical reaction
15. The SI unit of energy
17. A non-SI unit of energy; 1 cal=4.184 J
18. The energy an object has by virtue of its position in a field of force
20. A chemical reaction or a physical change in which heat is evolved (q is negative)

1. energy that flows into or out of a system because of a difference in temperature between a thermodynamic system and its surroundings
2. sum of the enthalpy changes for the individual steps
5. quantity of heat needed to raise the temperature of 1 g of a substance by 1°C at constant pressure
7. device used to measure the amount of heat absorbed or evolved in a physical or chemical change
8. energy required by a system to change volume against the constant pressure of the atmosphere
10. the ability to do work.
11. The energy associated with an object by virtue of its motion
12. The standard thermodynamic conditions chosen for substances
13. Energy may be converted from one form to another but total quantity of energy remains constant
16. property of a system that depends on only its present state
19. chemical reaction or a physical change in which heat is absorbed (q is positive)