Physical Science Chapter 4 Homework – Flashcards
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Water beads up on wax paper because its cohesive forces are greater than the adhesive forces.
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True
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Water molecules move back and forth between the liquid and gaseous phases
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At all times.
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What is the temperature that is the same numerical value on both the Fahrenheit and Celsius scale?
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-40º
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Molecules are the smallest units of matter with the characteristic properties of a substance.
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True
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What is the average temperature of healthy humans on the Celsius scale?
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37º
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The process by which gases form solids without first becoming a liquid is known as
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deposition.
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The nutritionist's Calorie is really a kilocalorie.
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True
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The sum of all the energy of the molecules of an object is called the temperature of that object.
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False
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Which thermodynamic law says that you cannot convert 100 percent of a heat source into mechanical energy?
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second law of thermodynamics
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Which of the following involves the greatest amount of heat when warming 100 grams of ice?
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evaporating the water
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Liquid water at 0ºC has to give up energy in order to become ice at 0ºC.
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True
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The amount of heat needed to increase the temperature of 1 gram of a substance 1 degree Celsius is known as
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specific heat.
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The water in a swimming pool is cooler than the surrounding sidewalk because it
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has a higher specific heat.
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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
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first law of thermodynamics.
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The attractive forces between unlike molecules is called
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adhesion.
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When water vapor condenses to a liquid
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it transfers heat to the surroundings.
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A passive solar home with direct solar gain requires
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all of these. (storage mass without carpets or drapes, a large, open window space, and a calculated overhang.)
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The transfer of heat that occurs when energy moves from molecules to molecule is called
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conduction.
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Temperature is a measure of the amount of heat stored in a substance.
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False
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Adding heat to a substance
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sometimes does not result in a temperature change.
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Your body judges temperature
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very poorly, sensing only heat flow.
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Molecules in a solid
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are held in nearly fixed positions by strong attractive forces.
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The degrees on the Celsius scale are larger than degrees on the Fahrenheit scale.
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True
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The molecules of a gas are much farther apart than molecules in a solid or liquid.
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True
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Iron heats up more rapidly than does aluminum because it has a greater specific heat.
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False
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The heat needed to warm one gram of water one Celsius degree is called a
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calorie.
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When the evaporation rate equals the condensation rate, the space above the liquid is
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saturated.
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The heat death of the universe is a theoretical time in the future when the universe is supposed to
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freeze at a uniform low temperature.
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The process by which solids vaporize without first becoming a liquid is called
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sublimation.
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In the equation: q=mC(Delta)T, the C stands for the
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specific heat.
