Download WS-obj. 1-22, ch. 6-16

AP Chemistry
Worksheet Ch.6 : Obj.1-22(1)
Name :
Date :
Read pp. 229-242 and answer the following :
1. _________________________ is the capacity to do work or produce heat.
2. State the law of conservation of energy.
3. ________________________ energy is energy due to position or composition.
4. _____ (T/F) The energy of sugar is an example of potential energy.
5. _________________________ energy is energy of motion.
6. KE =
7. ________________________ is a measure of the average kinetic energy of the particles of a substance
and indicates the random motions of the particles of a substance.
8. ________________________ is the total; kinetic energy of the particles of a substance and indicates the
ability to transfer energy from one object to another.
9. ________________________ is a force acting over a distance.
10. _____ (T/F) Work is independent of the pathway.
11. _____ (T/F) Energy is independent of the pathway.
12. _____ (T/F) State functions (or properties) depend only on the present condition of the system.
13. _____ (T/F) A change in a state function depends on the pathway.
14. _____ (T/F) Energy is a state function.
15. _____ (T/F) Heat is a state function.
16. _____ (T/F) Enthalpy is a state function.
17. _____ (T/F) A piece of magnesium metal is added to a test tube containing 10.0 mL of 3.0 M HCl. The
reaction becomes very hot. Heat is therefore lost by the system and is gained by the surroundings.
18. _____ (T/F) The above reaction is endothermic.
19. _____ (T/F) When ammonium chloride is dissolved the solution becomes very cold. This an exothermic
process because the surroundings lose energy.
20._____ (T/F) In a exothermic process the products have less potential energy than the reactants.
21. _____ (T/F) In an endothermic process the products have more energy than the reactants.
22. _____ (T/F) In an endothermic process the surroundings have lost energy.
23. _____ (T/F) In an exothermic process the surroundings have gained energy.
24. _____ (T/F) In an exothermic process some of the potential energy of the reactants has been changed to
thermal energy absorbed by the surroundings.
25. _____ (T/F) In an endothermic process the increase in potential energy of the products comes from thermal
energy of the surroundings being absorbed.
26. _____ (T/F) In an exothermic process more energy is released from the formation of the bonds in the
products than was consumed to break the bond in the reactants.
27. _____ (T/F) The bonds formed in the products of an exothermic reaction are stronger than the bonds of the
reactants in the reaction.
28. ____________________________ is the study of energy and its interconversions.
29. State the first law of thermodynamics.
30. The __________________energy (____) of system is the sum of all the kinetic and the potential energies
of all the particles of the system.
31. State the mathematical equation for change internal energy.:
32. _____ (T/F) When a system gains energy (endothermic) E is positive.
33. _____ (T/F) When the surroundings gain energy E is positive.
34. _____(T/F) When work is done on the surroundings energy flows out of the system and w is negative.
35. _____ (T/F) When a gas is compressed work is done on the system(and energy is gained) and w is positive.
36. _____ (T/F) When a gas is expanded work is done on the surroundings (and energy is lost by the system)
and w is negative.
37. ______________________ is a property of a system equal to E + PV.
38. _____(T/F) Since internal energy, volume and pressure are all state functions, enthalpy is a state function.
39. _____(T/F) At constant P, H of the system is equal to the flow of heat.
40. State the equation for the change in enthalpy for a chemical reaction.
41. _____ (T/F) H is negative for exothermic reactions.
42. _____________________________ is the science of measuring heat.
43. The ___________________________ ( ___ ) of a substance is the ratio of the heat absorbed by the
substance to its change in temperature.
44. The ________________ heat capacity of a substance is the heat capacity per gram of the substance.
45. The __________________heat capacity of a substance is the heat capacity per mole of the substance.
46. _____ (T/F) The heat of reaction is an extensive property because it depends on the amounts of the
substances reacted.