CHEM 1111 Chapter 10: Chapter 10 - Energy Changes in Chemical Reactions
Document Summary
System: the specific part of the universe that is of interest to us. Heat: transfer of thermal energy between two bodies that are different temperatures. Thermochemistry: the study of heat associated with chemical reaction. Energy cannot be created or destroyed, so energy released by system must be gained by surroundings. Exothermic: any process that gives off heat; thermal energy transferred from the system to the surroundings. The energy of the products of an exothermic reaction is lower than the energy of the reactants (because of heat released to surroundings) Endothermic: any process that requires heat; thermal energy transferred from the surroundings to the system. The energy of the products is higher than the energy of the reactants (because of heat required from the surroundings) Joule: si unit for energy; the amount of energy possessed by a 2 kg object moving at 1 m/s; 1 cal = 4. 184.
