HW 5

The lowest temperature possible in nature is

-273 degrees C.

The freezing point of water in the Celcius scale is

0 degrees C.

The specific heat capacity is the heat required to raise ____ of a substance by ____.

1 gram, 1 degree C

How much heat energy is required to heat 500g of water from 10 degrees C to 84 degrees C? The specific heat of water is 4.18 J/(g*C) Round your answer to 1 decimal place.

154660

The lowest temperature ever recorded in the United States is -78 degrees F. What is this temperature in kelvins? Round your answer to 1 decimal place

212.0

A friend from Europe is visiting you and sees the weather forecast on TV. The forecast is for a high temperature of 81 degrees Fahrenheit, and your friend asks you what this temperature is in Celcius. What do you tell her? Round your answer to 1 decimal place.

27.2

The freezing point of water in the Kelvin scale is

273 K.

Entropy is closely related to the

2nd law of thermodynamics.

Room temperature on the Kelvin scale is about

300 K.

The highest temperature ever recorded in the United States is 133 degrees F. What is this temperature in kelvins? Round your answer to 1 decimal place.

329.3

In your house, most heat is lost through the process of

Conduction

_______ is heat transferred through the motion of mass of a substance.

Convection

A temperature difference of 10 degrees Celsius is also equal to a temperature difference of 10 on the

Kelvin scale.

True or False: Heat is a form of energy.

True

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 good heat conductor is

a poor insulator.

Substances absorb heat energy by the process of

conduction, convection, radiation

The first law of thermodynamics is a restatement of the

conservation of energy

Aluminum has a specific heat capacity more than twice that of copper. Place equal masses of aluminum and copper wire in a flame and the one to undergo the fastest increase in temperature will be

copper

True or False: Temperature is a form of energy.

false

As a system becomes more disordered, entropy

increases

Your feet feel warmer on a rug than on a tile floor because a rug

is a better insulator than tile.

Energy transfer by convection is primarily restricted to

liquids and gases.

A substance that heats up relatively quickly has a

low specific heat capacity.

Systems that are left alone, tend to move toward a state of

more entropy

The molecules in an object with a higher temperature

move faster.

The earth receives about 1.7 x 10^17 J of energy from the sun each second through a process called

radiation.

True or False: Thermometers are usually based on the idea of thermal expansion.

true