CHEM102 Lecture Notes - Lecture 27: Spontaneous Process, Bond Energy, Kinetic Energy

• School: University of Alberta
• Department: Chemistry
• Course: CHEM102
• Professor: Camille Bowen-Forbes

Document Summary

Bond energies, spontaneous process and entropy: high bond energy means shorter bond length. Greater the number of electrons shared, stronger the bond energy: delh = bonds broken bonds made, there are three methods of calculation delh of a reaction: Del h= bonds broken bonds made. Q(cal: spontaneous process: occurs without a continuous input of energy from outside the system. But spontaneous reactions once started do not need energy input. Non-spontaneous process only occurs of the surroundings keep on supplying energy to the system. Under same conditions, reverse reaction of a spontaneous reaction is non-spontaneous: spontaneity is influenced by: Larger the number of possible microstates, the larger the number of ways in which a system can disperse energy. Spontaneous when from ordered state to random state. All spontaneous endothermic processes increase freedom of motion of the particles in the system. Delh does(cid:374)"t prede(cid:272)t spo(cid:374)ta(cid:374)eous (cid:272)ha(cid:374)ge, it (cid:272)a(cid:374) (cid:271)e either exother(cid:373)i(cid:272) or e(cid:374)dother(cid:373)i(cid:272). Spontaneous is not equal to fast: entropy (s)