Thermodynamics and Energy - APES

Which way does heat flow?

• hot to cold

• cold to hot

Heat travels from the sun to the earth by the process of...

• conduction
• convection
• radiation
• insulation

Warm air rising and the cool air sinking demonstrate this type of heat transfer. 

• conduction
• convection
• radiation
• Insolation 

Entropy increases from solid, liquid to gas. Why?

• Molecular disorder increases
• Molecular randomness decreases
• Molecules are more energetic
• Molecules are more reactive

What is the definition of CONDUCTION?

• When heat is transferred from objects like rays of light or electromagnetically.
• a  hot liquid or air that  expands, becomes less dense, and rises or becomes more dense, and sinks.
• When heat transfers from objects that are touching.
• When heat transfers through the heater or AC in your house.

What is the definition of CONVECTION

• When heat transfers through waves.
• When heat transfers from objects that are touching.
• a  hot liquid or air that  expands, becomes less dense, and rises or becomes more dense, and sinks.
• Heat traveling from the sun

You pick up a can of soda off of the countertop.  The countertop underneath the can feels colder than the rest of the counter.  Which explanation do you think is the best?

• The cold has been transferred from the soda to the counter.
• There is no heat energy left in the counter beneath the can.
• Some heat has been transferred from the counter to the soda.
• The heat beneath the can moves away into other parts of the countertop.

Temperature is a measure of the...

• total energy in a substance
• total kinetic energy in a substance
• average potential energy in a substance
• average kinetic energy of molecules in a substance

The second  law of thermodynamics states that entropy of a system  tends to ______________. 

• increase
• decrease
• stay constant
• fluctuate wildly

The first law of thermodynamics states that energy is

• created
• destroyed
• conserved
• created and destroyed