Heat transfer

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.

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

• Metals conduct heat better than wood.
• Wood conducts heat better than metals.
• Metals pull in heat because heat is attracted to metals.
• Wood isn't as strong as metals.

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

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

An aluminum plate and a plastic plate have been in the freezer all night long.  When you remove them the next morning, 

• the plates have the same temperature.
• the plastic plate has a higher temperature.
• the plastic plate has a lower temperature.
• the aluminum plate has a lower temperature.

Tags

NGSS.MS-PS1-4

When placed in direct sunlight, which object will absorb the most radiation?

• A black sweater
• A white sweater
• A snowball
• Aluminum foil

As water in a freezer turns into ice,

• the water absorbs energy from the air in the freezer.
• the water absorbs the coldness from the air in the freezer.
• the freezer air absorbs heat from the water.
• the water neither absorbs nor releases energy.

Hot air moving up is an example of 

• Radiation
• Conduction
• Magic
• Convection

A microwave oven uses which of the following to heat foods.

• Microwave elves
• Radiation
• Convection
• Conduction

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS4-2

A metal spoon heated by hot soup is an example of

• Conduction
• Transpiration
• Convection
• Radiation

Molecules in cold things move more _________
than in hot things.

• quickly
• slowly
• happily
• merrily

Tags

NGSS.MS-PS1-4