Types of Thermal Energy Transfer
Total Kinetic energy & Average kinetic energy
Phase change
Molecular Attraction and Kinetic energy
Vocabulary
100
Heat transfers through movement of fluids or gases
What is Convection?
100
Stack 1 has 30 molecules and they are all moving at a speed of 5. The average kinetic energy is __________.
What is 5?
100
A popsicle sits out in the hot Sun. (State the first order phase change (i.e, condensation, freezing, melting, evaporation) and the phase it was and the phase it was in after being in the hot Sun.)
What is melting/solid to liquid?
100
The molecules of Substance E and F are moving away from each other. Energy was transferred out and the molecules of Substance E are moving away from each other while the molecules of Substance F are moving around each other. The Substance with the weakest molecular attraction is________?
What is Substance E?
100
the energy that an object has because it is moving
What is kinetic energy?
200
What is Conduction?
200
There is a stack of books with 10 molecules and an average kinetic energy of 30. The total kinetic energy is__________.
What is 300?
200
Liquid chocolate changes phase when poured over ice cream
What is freezing/ liquid to solid?
200
The molecules of Substance A are moving around each other and the molecules of Substance B are moving around each other. Energy was transferred out and Substance A changed phase. Substance ____has a stronger molecular attraction?
What is the Substance A?
200
the relative size of things
What is scale?
300
Heat transfers through electromagnetic waves and travels through space
What is Radiation?
300
Stack 1 has an average kinetic energy of 24 and 5 molecules, Stack 2 has an average kinetic energy of 42 and 6 molecules. The average kinetic energy of the system is ___________.
What is 6?
300
A pot of water is sitting on a very hot stove. Over time the water disappeared.
What is evaporation/ liquid to gas?
300
The molecules of Substance C and D are moving in place, energy was transferred in. Substance D changed phase. What substance has a stronger molecular attraction?
What is Substance C?
300
a noticeably different form or state of the same substance
What is a phase?
400
Heat transfers through collisions or contact between neighboring atoms or molecules.
What is Conduction?
400
Dish 1 has 6 molecules and Dish 2 has 6 molecules. The total kinetic energy of Dish 1 is 85 and the total kinetic energy of Dish 2 is 59. The average kinetic energy is___________.
What is 12?
400
The lake made of water disappeared between October 28, 2021 and February 28, 2022. The temperature during the months of October-February ranged from 41°F and -12°F.
What is freezing/liquid to solid?
400
Hard candy is starting to melt in a hot pan. Did attraction overcome kinetic energy or kinetic energy overcome attraction?
What is The kinetic energy transferred in, overcame the molecular attraction?
400
the way molecules in a substance move around relative to each other
What is freedom of movement?
500
What is Radiation?
500
Dish 1 has 15 molecules and Dish 2 has 30 molecules. The average kinetic energy of Dish 1 is 3 and the average kinetic energy of Dish 2 is 5. The average kinetic energy of the system is ___________.
What is 4?
500
A cold metal bowl was taken out of the fridge and placed on a counter after, 3 minutes water droplets begin to form on the outside of the bowl.
What is condensation/gas to liquid?
500
The lake made of liquid water changed phase and froze between October 28, 2021 and February 28, 2022. The temperature during the months of October-February ranged from 41°F and -12°F. It changed phase because _______________.
What is Enough energy was transferred out of the liquid lake to allow the molecular attraction to pull the molecules together to overcome the kinetic energy that pulls the molecules apart?
500
a pull between two molecules that is always the same for a substance
What is molecular attraction?