CHEM 1202 Chapter : 5 15 Chem
Document Summary
Thermodynamics: thermo = heat (energy) dynamics = movement, motion. System: the portion of the universe that we are considering open system: energy & matter can transfer closed system: energy transfers only isolated system: no transfers. Isothermal: a system that is kept at a constant temperature by adding or subtracting heat from the surroundings. Heat capacity: the amount of heat energy required to raise the temperature of a certain amount of material by. Calorie: the amount of heat required to raise the temperature of 1g of water by 1 c. specific heat of water = 1 cal/g c. The specific heat of iron is 0. 45 j/ c g. q = heat energy = (specific heat)(mass)( t) Heat energy = (0. 45 j/ c g)(7. 0 g)(125-25 c) = + 315 j. *the sign (+/-) is very important as you will see. Energy: "the capacity to do work and/or transfer heat" The total amount of energy (and mass) in the universe is constant.
