Energy

How do molecules at warm temperatures differ from molecules at cool temperatures? 

• a.  At warm temperatures, molecules move around more
• b.  At warm temperatures, molecules grow in siz
• c.  At warm temperatures, molecules exchange electrons more easil
• d.  At warm temperatures, molecules combine with each other more easil

Why is there more thermal energy in an iceberg than in a pot of boiling water?    

• a.  The pot insulates the heated molecules
• b.  Most icebergs are fairly warm to the touch
•   c.  Icebergs contain many more molecules than pots of water
•   d.  Water does not hold heat very well

Andy stirred a hot drink in a styrofoam cup with a  metal spoon.  In what order did the thermal energy reach Andy's hand?

• cup-hot chocolate-hand
• hand-spoon-hot chocolate
• hot chocolate-spoon-hand
• hot chocolate-spoon-hand-cup

A barefoot student steps on a hot concrete surface. Most of the heat transferred to the student’s skin by this contact is by the process of—

• convection
• conduction
• vaporization
• radiation

The diagram to the right shows a solid iron bar that is being heated in a flame. The primary method of heat transfer in the solid iron bar is—

• convection
• conduction
• absorption
• radiation