CHEM 1127Q Lecture Notes - Lecture 9: Icicle, Kinetic Energy, Exothermic Process
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CHEM 1127Q Full Course Notes
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The chemistry of heat is known as thermochemistry. The higher the temperature, the more kinetic energy the particles have. The lower the temperature, the less kinetic energy the particles have. Heat capacity (c) - energy required to heat something by 1 degree celsius. Specific heat capacity (c) - energy required to heat 1 gram of something by 1 degree. Q is positive when heat flows into the system from the surroundings. Q is negative when heat flows from the system into the surroundings. Ch4 (g) + 2o2 (g) -> co2 (g) +2h20 (l) q<0. When the system (50. 0 g of h2o) absorbs heat from the surroundings (hot plate), its temperature increases from 50. 0 degrees c to 80. 0 degrees c. When the hot plate is turned off, the system gives off heat to the surrounding air, and its temperature drops. Exothermic: heat flows from the system to the surroundings. Endothermic: heat flows from the surroundings into the system.
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