Heat Transfer

You take a cold can of soda off of a countertop. The countertop underneath the can feels colder than the rest of the counter. Which of the following explains this occurrence?

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

After cooking an egg in boiling water, you cool the egg by putting it into a bowl of cold water. Which of the following explains the egg’s cooling process?

• a. Temperature is transferred from the egg to the water.

• b. Cold moves from the water into the egg.

• c. Heat is transferred from the water to the egg.

• d. Heat is transferred from the egg to the water

 Why do we wear sweaters in cold weather?

• a.  To keep cold out.
• b.  To generate heat
• c.  To reduce heat loss.
• d.  All of the above.

 Amy wraps her dolls in blankets but can’t understand why they don’t warm up. Why don’t they warm up?

• a.  The blankets she uses are probably poor insulators.
• b.  The blankets she uses are probably poor conductors
• c.  The dolls are made of materials which don’t hold heat well.
• d.  None of the above.

As water in a freezer turns into ice

• a. the water absorbs heat from the air in the freezer.

• b. the water absorbs the coldness from the air in the freezer.

• c. the freezer air absorbs heat from the water.

• d. the water neither absorbs or releases energy

  On a warm sunny day, you will feel cooler wearing light colored clothes because they 

• a.  reflect more radiated heat energy.
• b.  prevent sweating.
• c.  are not as heavy as dark clothes.
• d.  let more air in

 If you put a metal spoon and a wooden spoon into a pot of boiling water, one will become too hot to touch. Why? 

• a.  Metals conduct heat better than wood
• b.  Wood conducts heat better than metals.
• c.  Metals pull in heat because heat is attracted to metals.
• d.  Wood isn’t as strong as metals.

 On a hot day, the upstairs rooms in a house are usually hotter than the downstairs rooms. Why? 

• a.  Cool air is less dense than hot air.
• b.  Warm air rises and cool air sinks
• c.  The roof insulation warms the air.
• d.  Heat rises.

You have a can of soda in your lunchbox that you want to keep cold. Which material will work best to keep it cold?

• a. Aluminum foil wrapped around the soda because metals transfer heat energy easily.

• b. A paper towel wrapped around the soda because paper soaks up the moisture

• c. Wax paper wrapped around the soda because wax paper traps the moisture.

• d. Your wool sweater wrapped around the soda because wool traps air.

When you hold a metal coat hanger in a camp fire to roast a marshmallow, the coat hanger might become too hot to hold. Why might the coat hanger get too hot? 

• a.  The heat radiates along the coat hanger.
• b.  The heat builds up near the flame until it can’t hold it anymore and then moves     along the coat hanger.
• c.  Metal atoms vibrate with more energy when they get hot, and they collide with   atoms near them, which causes the neighboring atoms to vibrate.
• d.  Since metals melt in fire, they react strongly to fire and get hot easily.