Test5_StudyGuide

Test5_StudyGuide - Study Guide for Exam 6(Chapters 9 10 and...

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1. Definition of thermal energy Thermal energy is the total energy (kinetic and potential) of all atoms and molecules that make up a substance. 2. Temperature is a measure of average kinetic energy per molecule. Temperature is proportional to the average kinetic energy of molecular motion. 2 1 2 T KE mv =< : The higher temperature the higher average kinetic energy! The higher temperature the faster molecules move in a substance! Important: In a gas consisting of a mixture of the molecules of different masses, all molecules have the same average kinetic energy . It means that heavy molecules move more slowly than lighter molecules. 3. There are three basic temperature scales: The Celsius temperature scale The Fahrenheit temperature scale, and The Absolute temperature scale (or the Kelvin scale). Note: You should know what these scales are and how they are related to each other. What is the absolute zero temperature in Celsius, Kelvin, and Fahrenheit scales? Answer: 0 0 K = -273 0 C = - 459 0 F What is the freezing point of water in Celsius, Kelvin, and Fahrenheit scales? Answer: 273 0 K = 0 0 C = 32 0 F What is the boiling temperature of water in Celsius, Kelvin, and Fahrenheit scales? Answer: 373 0 K = 100 0 C = 212 0 F 4. Heat is the thermal energy transferred from one substance to another due to a temperature difference. What are the units to measure heat energy? Answer: joules (J) and calories (C),

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Test5_StudyGuide - Study Guide for Exam 6(Chapters 9 10 and...

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