Thermal Energy and Phase Change Review

Thermal Energy and Phase Change Review

-Ms. Foster

Multiple Choice

Which phase allows molecules to move around each other?

• Solid

• Liquid

• Gas

• None of the above.

Movement of Molecules

Solid- molecules move in place

Liquid- molecules move around each other

Gas- molecules move away from each other

Multiple Choice

Javon left a full water bottle outside of KIPP. When he went back to get his water bottle, the water was no longer visible. What happened to the water molecules?

• The molecules changed to gas phase and moved around in place.

• The molecules changed to solid phase and moved around in place.

• The molecules changed to liquid phase and moved around each other.

• The molecules changed to gas phase and moved away in place.

Evaporation is when a liquid becomes a gas. The molecules speed up

Multiple Choice

Why does your hand feel cold as an ice cube melts on it?

• Thermal energy is transferred from the ice to your hand

• Thermal energy can't transfer between your hand and ice

• Thermal energy is transferred from your hand to the ice

• Cold energy is transferred from the ice to your hand

Multiple Choice

Which type of heat transfer allows a hot air balloon to rise? Use the picture to help you.

• Radiation

• Conduction

• Convection

• Condensation

Convection, because as the heat from the flame is increased, less dense air

fills and lifts the balloon.

Multiple Choice

Ricky poured some kool-aid into a glass. When he puts the kool-aid in the glass, the energy of the glass decreases. What must be true of the energy of the kool-aid?

• Its energy decreases while the energy of the glass decreases.

• Its energy increases while the energy of the glass decreases.

• Its energy stays the same while the energy of the glass decreases.

• It is impossible to know without data on the number of molecules in

The Kool-Aid energy increases while the energy of the glass decreases.

The Kool-Aid was warmer than the cup, so the energy of the cup decreased.

Multiple Choice

What is the difference between conduction and radiation?

• Direct contact is not required for conduction or radiation

• Direct contact is required for conduction, but not for radiation.

• Conduction causes temperature to rise, but not for radiation.

• Radiation causes temperature to rise, but not for conduction.

Multiple Choice

Ralph and Sheila are at a construction site and they are stacking bricks. The diagram below shows the bricks before they touch. Use the information in the diagram to answer the question. After the bricks have been touching for a while, whose ​top brick will be cooler?

• Both will be the same temperature, because both bottom bricks transferred the same amount of energy.

• Sheila's top brick was will be cooler, because the energy that transferred to Sheila's top brick was spread out with more molecules.

• Ralph's top brick was cooler, because less energy has to transfer to Ralph's top brick.

We know that the hot energy always transfer to cold energy.

Ralph' top brick molecules will be warmer since the warmer molecules will easily take over the cooler molecules.

Sheila's top brick will be cooler since there are not many warm molecules to take over the cooler molecules.