How is the Hf of an endothermic reaction expressed?

Question

9. How is the Hf of an endothermic reaction expressed? (Points: 2)

as a negative quanity

as a positive quantity

none of the above

10. How is the ∆S of a spontaneous reaction expressed? (Points: 2)

as a negative quanity

as a positive quantity

none of the above

11. Are the molecules in gases orderly or disorderly? (Points: 2)

orderly

disorderly

none of the above

12. What is the amount of heat needed to raise the temperature of 1 gram of water 1o C? (Points: 2)

kinetic energy

potential energy

heat of fusion

specific heat

13. A reaction will occur faster by: (Points: 2)

raising the temperature

lowering the temperature

stabilizing the temperature

14. A catalyst is a substance that speeds up a reaction without becoming a reactant itself.: (Points: 2)

True

False

15. Which theory proposes that molecules must collide in order to react? (Points: 2)

acid/base theory

relativity theory

collision theory

Answer 1

9. as a positive quantity

10. as a positive quantity

11. disorderly

12. specific heat

13. raising the temperature (except when catalysts are involved which lose activity at higher temperature, as with enzyme-catalyzed biological reactions)

14. true

15. collision theory