Act4_sol - Period 4 Activity Solutions: Transfer of Thermal...

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Period 4 Activity Solutions: Transfer of Thermal Energy 4.1 How Does Temperature Differ from Thermal Energy? a) Temperature Your instructor will demonstrate molecular motion at different temperatures. 1) What happens to molecular motion at higher temperatures? Molecules move faster at higher temperatures 2) Define temperature in terms of molecular motion. Temperature in Kelvin is a measure of the average kinetic energy of the molecules of a substance b) Thermal Energy 1) What is thermal energy? How does thermal energy differ from temperature? Thermal energy is the TOTAL internal energy of the atoms and molecules of a substance. Temperature is the AVERAGE kinetic energy of the molecules of a substance. 2) Which has more thermal energy – a cup of hot coffee or a bathtub full of warm water? The coffee is at a higher temperature, but the bathtub has more thermal energy because the bathtub contains many more molecules. c) Thermometers Examine the four types of thermometers and explain what changing property each type of thermometer relies upon. 1) alcohol thermometers expansion of liquid alcohol when heated 2) bimetallic strip thermometers expansion of metal strips at varying rates when heated 3) liquid crystal thermometers crystals change color when heated or cooled 4) infrared thermometer frequency of the radiation d) Temperature Scales Your instructor will discuss Fahrenheit, Celsius and Kelvin temperature scales. 1) Examine a thermometer with both Fahrenheit and Celsius scales. On the Celsius scale, how many degrees are between the freezing point and the boiling point of water? __ 100 degrees C__ 2) On the Fahrenheit scale, how many degrees are between the freezing point and the boiling point of water? _ 180 degrees F_ 3) Use the number of degrees between the freezing and boiling points of water to make a ratio of the number of Celsius degrees per Fahrenheit degrees. 100
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Act4_sol - Period 4 Activity Solutions: Transfer of Thermal...

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