Thermodynamics

Steam burns are more damaging than burns caused by boiling water because steam

Choices A & B are both correct (has more energy per kg than boiling water, gives up additional energy when it condenses)

Heat energy is measured in units of

Choices A & B are both true (calories and joules)

Substances absorb heat energy by the process of

all of these (conduction, convection, radiation)

If you were caught in freezing weather with only a candle for heat, you would be warmer in

an igloo

Consider a metal ring with a gap cut in it. When the ring is heated, the gap

becomes wider

A liter of hot water will cool to room temperature faster in a

black pot

Cold water will warm to room temperature faster in a

black pot

If you want to cook eggs by boiling them while on the mountains, then compared to sea-level cooking, you should

boil the eggs for a longer time

Newton's law of cooling applies to objects that are

both of these (heating, cooling)

When mechanical work is done on a system, there can be an increase in

both temperature and internal energy

The first law of thermodynamics is a restatement of the

conservation of energy

Melting snow

cools the surrounding air

Ice is put in a cooler to cool the contents. To speed up the cooling process, the ice can be

covered with salt

As a piece of metal with a hole in it cools, the diameter of the hole

decreases

When heat is added to boiling water, its temperature

does not change

Hot water has a relatively high rate of

evaporation

Wrapping a hot potato in aluminum foil significantly reduces the rate at which it cools by

evaporation

A substance can be sprayed on crops to prevent frost formation under many conditions. If frost did not form on the fields and wood of an entire continent, cold nights would be

even colder

When water at 4 degrees C is heated it expands. When water at 4 degrees C is cooled, it

expands

When you touch a cold piece of ice with your finger, energy flows

from your fingers to the ice

A good absorber of radiation is a

good emitter of radiation

An adiabatic process is characterized by the absence of

heat exchange

Food in a pressure cooker is cooked faster because of the

higher temperature

Compared to a giant iceberg, a hot cup of coffee has

higher temperature, but less internal energy

In a mixture of hydrogen gas, oxygen gas, and nitrogen gas, the molecules with the greatest average speed are those of

hydrogen

If you run a refrigerator in a closed room with the refrigerator door open, the room temperature will

increase

Suppose you rapidly stir some raw eggs with an eggbeater. The temperature of the eggs will

increase

When a volume of air is compressed, its temperature

increases

One of the main reasons one can walk barefoot on red-hot coals of wood without burning the feet has to do with

low thermal conductivity of the coals

Suppose you want to save energy and you're going to leave your cool house for a half hour on a hot day. You should turn the temperature setting on the air conditioner

off altogether

When a gas is changed to a liquid state, the gas

releases energy

Evaporation is a cooling process and condensation is

a warming process

When a solid is changed to a liquid state, the solid

absorbs energy

The lowest temperature possible in nature is

-273 degrees C

A volume of air has a temperature of 0 degrees Celsius. An equal volume of air that is twice as hot has a temperature of

273 degrees C

Before ice can form on a lake, all the water must be cooled to

4 degrees C

The fact that desert sand is very hot in the day and very cold at night is evidence that sand has

a low specific heat

A refrigerator

removes internal energy from inside the refrigerator

If you stake a plot of land with a steel tape on a very hot day, the actual amount of land you will have will be

smaller than measured

The white-hot sparks that strike your skin from a 4th-of-July-type sparkler don't harm you because

the energy per molecule is high, but little energy is transferred because of the few molecules in the spark

A water-filled paper cup held in a flame will not catch fire. This is because

the paper cup cannot become approx. hotter than the water it contains

The fact that a thermoeter "takes its own temperature" illustrates

thermal equilibrium

Consider a closed, sealed can of air placed on a hot stove. The contained air undergoes an increase in

two of these (pressure, temperature)

During a very cold winter, water pipes sometimes burst. The reason for this is

water expands when freezing