Thermal Energy CH2 review

A 65 degree sample makes contact with a 35 degree sample, how will the systems react?

• The red will get hotter along with the black

• The red will get hotter with energy from the black until they are equal

• The black will get colder with energy from red until they equal

• The black will share energy with the red forever

A 65 degree sample makes contact with a 35 degree sample, at what temperature will the systems be at equilibrium?

• 45

• 30

• 50

• 55

How do air conditioners cool the air?

• Air conditioners cool air by air slowing molecules down.

• Air conditioners cool air by speeding air molecules up.

• Reaching Equilibrium at the same time

• Creating hot air instead of cold air

Why does the transfer of energy between two colliding things stop?

• Molecules stop transferring energy when colliding systems reach equilibrium

• When the two non-colliding things get equally hot molecules make energy

• Molecules make more kinetic energy until it is balanced

• The molecules of a system destroy energy when the system is balanced

Imagine that your Mom just put a frozen Bubba-Burger on the hot grill to sizzle? In energy terms what is happening?

• The Bubba-Burger molecules are transferring energy to the grill

• The Bubba-Burger is at equilibrium with the grill

• The grill molecules are transferring energy to the Bubba-Burger

• The grill is creating energy with the Bubba-Burger

Your family orders a pizza from Dominoes during CoVid19, the driver left the bag open. The pizza is cold. What happened?

• The energy in the molecules of the pizza decreased

• The pizza lost heat molecules

• The cold energy in the molecules of the pizza increased

• The energy in the molecules of the pizza increased

7. How does the temperature of the top cube compare with the temperature of the bottom cube before touching, and what will happen when the cubes have been touching for a while?

• a. Before the cubes touch, the bottom cube is hotter than the top cube. Once the cubes are touching, the cooler top cube will gain kinetic energy until the molecules of both cubes have an energy of 7, because hotter things increase the temperature of cooler things.

• b. Before the cubes touch, the bottom cube is hotter than the top cube. Once the cubes are touching, the bottom cube will transfer kinetic energy to the molecules in the cooler top cube until both cubes reach the same temperature, which will be in between their starting temperatures.

• c. Before the cubes touch, the bottom cube is cooler than the top cube. Once the cubes are touching, the top cube will transfer kinetic energy to the molecules in the cooler bottom cube until both cubes reach the same temperature, which will be in between their starting temperatures.

• d. Before the cubes touch, the two cubes are different temperatures. Once the cubes are touching, both kinetic energy and cold energy will transfer between the molecules in the two cubes until both cubes reach the same temperature, which will be in between their starting temperatures.

Eric pours some iced tea into a glass. When he puts the iced tea in the glass, the energy of the glass decreases. What must be true of the energy of the iced tea?

• a. The ice tea's energy decreases while the energy of the glass decreases.

• b. The ice tea's energy increases while the energy of the glass decreases.

• c. The ice tea's energy stays the same while the energy of the glass decreases.

• d. It is impossible to know without data on the number of molecules in each object.