|
Water beads up on wax paper because its cohesive forces are greater than the adhesive forces. |
True |
|
Water molecules move back and forth between the liquid and gaseous phases |
At all times. |
|
What is the temperature that is the same numerical value on both the Fahrenheit and Celsius scale? |
-40º |
|
Molecules are the smallest units of matter with the characteristic properties of a substance. |
True |
|
What is the average temperature of healthy humans on the Celsius scale? |
37º |
|
The process by which gases form solids without first becoming a liquid is known as |
deposition. |
|
The nutritionist’s Calorie is really a kilocalorie. |
True |
|
The sum of all the energy of the molecules of an object is called the temperature of that object. |
False |
|
Which thermodynamic law says that you cannot convert 100 percent of a heat source into mechanical energy? |
second law of thermodynamics |
|
Which of the following involves the greatest amount of heat when warming 100 grams of ice? |
evaporating the water |
|
Liquid water at 0ºC has to give up energy in order to become ice at 0ºC. |
True |
|
The amount of heat needed to increase the temperature of 1 gram of a substance 1 degree Celsius is known as |
specific heat. |
|
The water in a swimming pool is cooler than the surrounding sidewalk because it |
has a higher specific heat. |
|
A statement that the energy supplied to a system in the form of heat, minus the work done by the system, is equal to the change in internal energy represents the |
first law of thermodynamics. |
|
The attractive forces between unlike molecules is called |
adhesion. |
|
When water vapor condenses to a liquid |
it transfers heat to the surroundings. |
|
A passive solar home with direct solar gain requires |
all of these. (storage mass without carpets or drapes, a large, open window space, and a calculated overhang.) |
|
The transfer of heat that occurs when energy moves from molecules to molecule is called |
conduction. |
|
Temperature is a measure of the amount of heat stored in a substance. |
False |
|
Adding heat to a substance |
sometimes does not result in a temperature change. |
|
Your body judges temperature |
very poorly, sensing only heat flow. |
|
Molecules in a solid |
are held in nearly fixed positions by strong attractive forces. |
|
The degrees on the Celsius scale are larger than degrees on the Fahrenheit scale. |
True |
|
The molecules of a gas are much farther apart than molecules in a solid or liquid. |
True |
|
Iron heats up more rapidly than does aluminum because it has a greater specific heat. |
False |
|
The heat needed to warm one gram of water one Celsius degree is called a |
calorie. |
|
When the evaporation rate equals the condensation rate, the space above the liquid is |
saturated. |
|
The heat death of the universe is a theoretical time in the future when the universe is supposed to |
freeze at a uniform low temperature. |
|
The process by which solids vaporize without first becoming a liquid is called |
sublimation. |
|
In the equation: q=mC(Delta)T, the C stands for the |
specific heat. |
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