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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.