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.
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
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:_________________
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?
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.
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.)