Ch 15 Thermal Energy

How warm or cold or hot something feels is related to 

• temperature
• random motion
• thermal expansion
• forced air

Which of the following is an example of thermal energy transfer by conduction?

• boiling water in a tea kettle
• hot air in a big hot air balloon
• warmth from the campfire
• warmth you feel holding a mug of coffee

____ is the name for thermal energy that moves from a warmer object to a cooler one.

• Kinetic energy
• Heat
• Calories
• Thermos

Many  materials (like foam) contain spaces filled with air because air is what type of material?

• conductor
• coolant
• insulator
• radiator

Thermal energy which moves from the sun to Earth is an example of which process?

• convection
• expansion
• radiation
• conduction

Which of the following describes the thermal energy of particles in a substance?

• average value of all kinetic energy
• total value of all kinetic energy
• total value of all both potentail and kinetic energy
• none of the choiceds

Which occurs if two objects at different temperatures are in contact?

• convection
• condensation
• radiation
• conduction

What happens to most materials when they become warmer?

• the molecule contract
• the molecules float
• the molecules turn into a gas or vaporize
• the molecules expand

On the Celsius scale, water freezes at 0 degrees, compared with the Fahrenheit scale, water freezes at ___ degrees. 

• 10
• 32
• 212
• 68

Thermometers work because liquids ____ when heated. 

• turn red
• shrink
• expand
• evaporate