Thermal Energy Transfer

Thermal energy describes...

• the potential energy of molecules

• the motion energy of molecules

When you heat something up, 

• the atoms speed up

• the atoms slow down

Conduction is the transfer of thermal energy by...

• direct contact

• waves

• circulating fluid or gas

Convection is the transfer of thermal energy through...

• direct contact

• circulating fluids

• waves

Radiation transfers thermal energy by...

• circulating fluids

• waves

• direct contact

Thermal energy is transferred from...

• the cold object to the hot

• the hot object to the cold

Why did the skinnier rod melt the chocolate faster than the bigger rod?

• The skinnier rod has less mass (fewer atoms) than the bigger rod. 

• It didn't. The bigger rod melted the chocolate faster.

Heating something up causes particles to...

• pack together

• spread apart

When molecules spread apart, they are...

• more dense

• less dense

When molecules are less dense, they..

• rise

• sink