AP Chem Unit 6

4. There is only ___ and the absence of ____
5. Overall enthalpy change in a reaction equals the sum of enthalpy changes for the individual steps.
6. In a ___ system, heat can flow in and out, but matter cannot.
12. If ∆H is ____ zero, the reaction is endothermic because more energy is needed to break bonds.
14. In an endothermic reaction, the surroundings get ___ in temperature.
15. A substance with low specific heat capacity has less ___ to temperature changes.
17. ___ energy is in molecules in motion
20. Stable compounds have a large ____ enthalpy of formation.
21. If a substance has high specific heat capacity, it is ____ to change its temperature.
22. ____ capacity is the energy required to raise the temperature of one gram of a substance by one degree C.
23. ____ is associated with expanding or contracting gases
24. Difference in energy between bonds broken and bonds formed
25. Average value of gas-phase bond dissociation energy

1. During heat transfer, total energy is ___.
2. device used to measure heat content
3. When only potential energy is changing, the substance is undergoing a ____ ____.
7. In this type of reaction, energy is released by the system.
8. experiment to determine specific heat of a substance
9. ____ energy is contained in bonds
10. A coffee cup calorimeter is a type of constant ___ calorimetry.
11. The heat content of a system
13. the ability to do work
16. A property that is independent of the pathway.
18. If heat is added to the system, during a reaction, that reaction is ___.
19. First step to determine bond enthalpy is to draw the ____ for all species.