1. Chapter 9

2. 1. What ingredients are needed for a fire? a.a fuel source b.oxygen gas c.heat d.all of the above

3. 2. What is heat? a.a mass form transferred from object to object upon contact b.an energy form transferred from object to object upon contact c.a mass–energy transfer when hot and cold objects come into contact d.an energy form transferred from hot to cold objects when they come in contact with each other

4. 3. When two or more objects touch and reach the same temperature, this condition is called a.static equilibrium b.thermal equilibrium c.dynamic equilibrium d.isotonic equilibrium

5. 4. What is the SI unit of heat energy? a.the joule b.the calorie c.the coulomb d.the o C

6. 5. What is another term for a smoke explosion? a.a limiting thrust b.a vapor blow c.a back draft d.a fire triangle

7. 6. Why are some wood-based smokes white and others black? a.It depends on the completeness of the burning. b.It depends upon the water content of the wood being burned. c.It depends on the color of the wood being burned. d.It depends on the size of the wood being burned.

8. 7. The complete combustion of wood has carbon dioxide as one of its products. a.True b.False

9. 8. Balancing a combustion equation should be done in what elemental order? a.C-H-O b.H-O-C c.O-H-C d.C-O-H

10. 9. Which is the balanced equation for the complete combustion of ethanol (C 2 H 5 OH) in oxygen gas? a.C 2 H 5 OH + 3 O 2 2 CO 2 + 3 H 2 O b.2 C 2 H 5 OH + 6 O 2 4 CO 2 + 6 H 2 O c.2 C 2 H 5 OH + 7/2 O 2 4 CO 2 + 6 H 2 O d.C 2 H 5 OH + 7 O 2 4 CO 2 + 6 H 2 O

11. 10. Which is the balanced equation for the complete combustion of methanol (CH 3 OH) in oxygen gas? a.2 CH 3 OH + O 2 2 CO 2 + 4 H 2 O b.2 CH 3 OH + 3 O 2 2 CO 2 + 4 H 2 O c.CH 3 OH + 3 O 2 2 CO 2 + 2 H 2 O d.CH 3 OH + 3 O 2 CO 2 + 4 H 2 O

12. 11. The complete combustion of methane gas (CH 4 ) in oxygen gas is what? a.CH 4 + 2 O 2 CO 2 + 2 H 2 O b.2 CH 4 + 2 O 2 2 CO 2 + 2 H 2 O c.CH 4 + 2 O 2 2 CO 2 + 2 H 2 O d.2 CH 4 + 2 O 2 CO 2 + 2 H 2 O

13. 12. Why is heat needed to initiate combustion? a.Energy is needed to start the fuel–oxygen reaction. b.Liquids and solids need to be converted to vapors. c.neither of the above d.both of the above

14. 13. What do all exothermic reactions produce? a.heat b.light c.smoke d.fumes

15. 14. In an exothermic reaction energy diagram, what is the relationship between the reactants' and the products' energies? a.The products are higher than the reactants. b.The reactants are higher than the products. c.Both reactants and products are the same energy. d.The reactants are always higher than the activation energy.

16. 15. Endothermic processes always give off heat at the completion of the reaction. a.True b.False

17. 16. What physical change occurs at the melting point of a material? a.liquid becomes gas b.solid becomes liquid c.liquid becomes solid d.solid becomes gas

18. 17. In the temperature vs. heat diagram below what does a plateau represent? a.an equilibrium adjustment b.the loss of heat c.the addition of heat d.a phase change

19. 18. The amount of energy required to convert a liquid to a gas is known as what? a.the heat of conversion b.the heat of vaporization c.the heat of gasification d.the heat of nebulization

20. 19. What is the heat of fusion? a.the heat needed to melt a solid completely. b.the heat required to join two metals. c.the heat needed to separate two metals. d.the heat required to melt a fuse.

21. 20. What does the following graph represent? a.Exothermic reaction b.Endothermic reaction c.Erythrothermic reaction d.A lame roller coaster ride

22. 21. What does the following graph represent? a.Exothermic reaction b.Endothermic reaction c.Erythrothermic reaction d.A lame roller coaster ride

23. 22.How does a flashover spread? a.across the ceiling of a room where a fire exists b.through the ventilation system of a house c.across the floor of a room where a fire exists d.through other combustible material in a room where a fire exists

24. 23. Read the statement given above. What type of chemical reaction occurs when the product of a reaction is colder than the reactants? a.endothermic reaction b.exothermic reaction c.exergonic reaction d.catalyzed reaction In chemical reactions between substances, energy is either released or absorbed.

25. 24. Study the statement given above. What type of chemical reaction occurs when energy must be provided for the reaction to take place? a.endothermic reaction b.exothermic reaction c.exergonic reaction d.catalyzed reaction In chemical reactions between substances, energy is either released or absorbed.

26. 25.The graph below illustrates what type of reaction? a.endothermic b.exothermic c.exergonic d.unable to determine from the information given

27. 26.Water cools from 4°C to –4°C. During this time, what happens to the motion of the molecules? a.The motion of the molecules stops. b.The motion of the molecules increases. c.The motion of the molecules decreases. d.The motion of the molecules remains the same.

28. 27. a.-120 kJ b.-40 kJ c.+ 160 kJ d.+ 40 kJ

29. 28. Starting as a solid, then liquid, and then gas, a sample of a substance is heated at a constant rate. The graph below shows the changes in temperature of this sample. What is the melting point of the sample and the total time required to completely melt the sample after it has reached its melting point? a.50 o C and 3 min b.50 o C and 5 min c.110 o C and 4 min d.110 o C and 14 min

30. Conversions Know how to convert calories, Calories, kilocalories, Joules, & kiloJoules!

31. Heat energy Know how to use the formulas: Heat energy = (mass)(heat of fusion) Heat energy = (mass)(heat of vaporization)