1. I’m so hot Chill out, man Counting
Calories
Going through
a phase
I’m not a
category
1 1 1 1
2 2 2 2
3 3 3 3
4 4 4 4
5 5 5

2. I’m So Hot 1
• Heat is what form of energy?

3. I’m so Hot 1
• Kinetic

4. I’m So Hot 2
• Heat is measured in what units? (name 2)

5. I’m so Hot 2
• Calories or Joules

6. I’m so Hot 3
• If you paint a thermos bottle silver on the
outside, what type of heat transfer are you
trying to reduce? Why/how?

7. I’m So Hot 3
• Radiation: to reflect it

8. I’m So Hot 4
Why is the water cooler at the bottom of the
lake in the summer?
What form of heat transfer is related to this?

9. I’m so Hot 4
• Fluids that are cool are dense and sink to the
bottom of their containers. This drives
convection

10. I’m so Hot 5
• Does the pressure of the air in car tires change
as you drive? If so, does it go up or down and
why would it?

11. I’m so Hot 5
• Goes up. Friction with road causes heating of
air in tires which increases the pressure.

12. Chill Out, Man 1
• The cold temperature of -200 degrees Celsius
equals what on the Kelvin scale?

13. Chill Out, Man 1
• 73 Kelvin

14. Chill Out, Man 2
• If you want to freeze 20 mL of water, how
many calories do you need to remove from
the water if it’s at 0 deg C?

15. Chill Out, Man 2
• 20 g * 80 cal/g = 1600 cal

16. Chill Out, Man 3
• A 10 g piece of glass gets cooled from 30
degrees C down to 20 degrees C. Its specific
heat is .20 cal/g*degrees C. How much heat
was lost by the glass?

17. Chill Out, Man 3
• 10 g * (-10 °C) * .2 cal/g °C)= - 20 cal

18. Chill Out, Man 4
• Which would be better to use for cooking a
big pot of pasta sauce: A Steel or copper pot?
• Defend your answer.
• Hint: You cook it for a long time but don’t
want to burn the bottom of the sauce.

19. Chill Out, Man 4
• Iron.

20. Chill Out, Man 5
• Use the word “insulate” to explain why it is so
difficult for scientists to make a substance
reach absolute zero.

21. Chill Out, Man 5
Heat always manages to get into the substance.
It’s really difficult to insulate heat from getting
through to the experiment.

22. Counting Calories 1
• A chemical reaction takes place in a
calorimeter. The following data are obtained:
• Mass of water: 500 g
• Initial Temp of water: 30 degrees C
• Final Temp of water: 45 degrees C

23. Counting Calories 1
• 7500 cal

24. Counting Calories 2
• Where does the word “calorie” come from?

25. Counting Calories 2
• Scientists originally thought heat was an
invisible fluid called “caloric”

26. Counting Calories 3
• What is the specific heat of water?

27. Counting Calories 3
• 1 cal/g °c

28. Counting Calories 4
True or false: A thermometer measures calories.

29. Counting Calories 4
• False

30. Counting Calories 5
• A Big Mac with 550 Calories is how many
calories?

31. Counting Calories 5
• 550,000 calories

32. Going through a phase1
• Gases ________when heated and
______when cooled.

33. Going through a phase 1
• expand
• contract

34. Going through a phase 2
• If you skip going from a solid and go straight
to a gas, it’s called:___________
• The opposite is called:_________________

35. Going through a phase 2
• Sublimation
• deposition

36. Going through a phase 3
• The heat you have to add to water at its
boiling point in order to get it to turn into a
gas is known as _______________
• Its value is: ____________

37. Going through a phase 3
• Heat of vaporization
• 540 cal/gram

38. Going through a phase 4
• Answer 3 a b c d and e on page 39 in text.

39. Going through a phase 4
• C
• A and B
• C has faster molecules, on average
• The same
• Containers B & C

40. Simply working it 5
• Scissors 1st
• Hockey Stick 3rd
• Wheelbarrow 2nd
• Pliers 1st

41. Energizer Bunny 1
• List which of the five forms of energy are
potential
• Then, list which of the five forms of energy are
kinetic

42. Energizer Bunny 1
• Potential: nuclear and chemical
• Kinetic: heat, electromagnetic, mechanical

43. Energizer Bunny 2
• If an object has a mass of 50 kg and is moving
at 2 m/s, what is its kinetic energy?
• If the same object is held 3 meters high above
the ground what is its gravitational potential
energy?

44. Energizer Bunny 2
• 100 J
• 1470 J

45. Energizer Bunny 3
• After the car is lifted up the first hill, a
rollercoaster runs on gravity. If the energy of
the coaster is equal to its starting GPE, why
must the rest of the hills be lower in height
than the first?

46. Energizer Bunny 3
• Because of the law of conservation of energy,
the coaster’s height on successive hills can
never be higher than the starting, otherwise,
it would be gaining energy.
• In fact, it loses a lot of energy as noise and
heat due to friction as it travels: requiring
even lower hills later

47. Energizer Bunny 4
• Describe an energy conversion that involves
turning mechanical energy into heat.

48. Energizer Bunny 4
• Rubbing hands

49. Energizer Bunny 5
• If a ball is thrown upward into the air at a
release height of 2 meters, goes up, then falls
back to earth, its speed at its starting height is:
• A) greater than the speed thrown at (because
of gravity)
• B)less than the speed thrown at (because of
friction
• C) equal to the speed thrown at (just because)

50. Energizer Bunny 5
• C: KE at that height is equal (what you put
into system is what you get out…..energy is
conserved.)