CHEM120L Lecture Notes - Sodium Chloride, Prentice Hall, Heat Capacity
8 Apr 2014
School
Department
Course
Professor
Document Summary
Osmosis and its impact on structures of animal and plant cells. In a chemical reaction, change in energy of a system is often depicted by change in heat (q). The first law of thermodynamic states that energy is conserved; energy can be neither lost nor destroyed. That is, if a system was to gain or lose heat, it must interact with the source of heat; the surroundings of the system. This derives the equation: qsystem = - qsurrounding. This essential means that in a perfect system, all the heat lost from the system would be transferred to the surrounding, and vice versa. A reaction can be either endothermic or exothermic. In an endothermic reaction, a net absorption of heat occurs. In this case, q value would be positive for the system while it is negative for the surrounding, as in an endothermic reaction, the system would absorb heat from the surrounding.
