Chemistry: Heat Transfer

Why does food wrapped in aluminum foil keep warm for a long time?

• Aluminum foil is an insulator and prevents heat loss by conduction.
• Aluminum foil forms an air-tight seal and prevents heat loss by convection.
• The silver surface of the foil reflects heat in and prevents heat loss by radiation.
• The silver surface of the foil absorbs heat from the surroundings and keeps the food warm.

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A toaster toasting bread is an example of 

• condensation
• conductio
• convection
• radiation

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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.

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In heat transfer, heat always flows from the _______________ substance to the _______________ substance.

• Hotter to colder
• Colder to hotter
• Hotter to hotter
• Colder to colder

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The type of heat transfer that happens through direct contact of molecules or particles with each other is ___________________.

• Convection
• Conduction
• Radiation
• insulation.

The kind of heat transfer that travels through space in electromagnetic waves is ______________________.

• insulation.
• Radiation
• Conduction
• Convection

___________________ is the type of heat transfer that occurs in fluids, such as warm air rising and cold air sinking; creating wind.

• Convection
• Conduction
• Radiation
• insulation.

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Which of the following is the best example of conduction?

• a heat lamp warming a beaker of water

• water boiling in a pot

• frying an egg

• gases circulating in the atmosphere

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Warm air rises and cold air sinks demonstrates this type of heat transfer.

• conduction

• convection

• radiation

• huh?

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Which statement is true?

• The quicker a molecule moves, the colder it is.
• The slower a molecule moves, the warmer it is.
• The quicker a molecule moves, the warmer it is
• The movement on molecule don�t affect its temperature

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