1. Heat, Temperature, and vie Revie w

2. Thermal Energy Total potential and kinetic energy associated with the random motion and arrangement of the particles of a material! – Not concerned with the kinetic energy of the object itself!!

3. Heat Thermal Energy that is absorbed, given up, or transferred from one substance to another. – It is thermal energy on the move!!

4. Temperature Measure of the average kinetic energy of the particles in a sample of matter!!

5. Which beaker is hotter? Which beaker gives off more heat? Relationship between Heat and Temperature: 80 o C Which could melt more ice? Temperature is the same, amount of heat is different!! 80 o C

6. Which has a higher temperature? 10 o C 30 o C 50 o C 80 o C A BC D

7. Which gives off more heat? 10 o C 10 o C A BC D

8. Heat Flow Heat always flows from a substance with a high temperature to a substance with a low temperature even if lower temperature substance has more thermal energy!!

9. Which direction will heat flow? A. A to B B. B to A C.Neither D.Both A to B and B to A

10. In which choice will heat flow fastest from Y to X? A B C D

11. In which choice will heat flow fastest from X to Y? A B C D

12. Specific Heat Heat required to change the temperature of a substance. Different substances have different specific heats. – They conduct heat at different rates!! – Consider Sand and Water!!! – Think about the beach! – Land breezes and Sea breezes!!

13. Specific Heats of some common substances: Substance Specific Heat (J/g o C) Water4.18 Iron.450 Lead.13 Silver.245 Copper.390 Aluminum.900 Alcohol2.43 Mercury.14 Platinum.13 Ammonia4.71 Zinc.39

14. The higher the specific heat, the more heat required to change temperature!! Things with high specific heats take a long time to heat up and a long time to cool down!! Things with a low specific heat, get Hot fast, but also cool fast!!

15. Heat required to change the temperature can be determined by: Where: Q = heat energy in Joules(J) m = mass in grams(g) C P = Specific Heat Capacity(in J/g* o C)  T = Temperature in o Celsius( o C)

16. Ex. How much heat is required to change the temperature of a 250 g sample of water from 15 o C to 60 o C? Given: m = 250 g  T = 45 o C C p = 4.18 Q = ??? Q = 250 g(4.18)(45 o C) Q = 47,025 J

17. Ex. How much heat is required to change the temperature of a 495 g sample of copper from 60 o C to 240 o C? Given: m = 495 g  T = 180 o C C p =.390 Q = ??? Q = 495 g(.390)(180 o C) Q = 34,749 J

18. Ex. How much heat must be removed from a 210 g iron bar to reduce its temperature from 150 o C to 25 o C? Given: m = 210 g  T = 125 o C C p =.450 Q = ??? Q = 210 g(.450)(125 o C) Q = 11,812.5 J A. 16,536.5 J B. 11,812.5 J C. 9,450.5 J D. 5,480.5 J

19. How does heat move between substances: How many different ways are there to cook a hotdog? 3 Name them:

20. 3 Ways to Cook a Hotdog!!! Conduction Convection Radiation

21. 3 Ways to Transfer Heat 1.Conduction---direct contact 2.Convection—transfer of heat in liquids and gases!! 3.Radiation—transfer through empty space!!

22. Conduction

23. Convection

24. Radiation

28. Transferring Heat Energy Wst. Heat Equation Wst.