CHEM 112 Lecture Notes - Bravais Lattice, Electrosynthesis, Electrowinning
29 Jan 2014
School
Department
Course
Professor
Document Summary
Non standard conditions: concentration not always 1m or pressure not always 1atm, delta e cell not = delta e degree cell. Nernst equation: ecell eocell (rt)/(nf) lnq nernst equation. *** n = moles o f electrons transferred in redox: refer to slide 5 and 6 for special cases for nernst equation. If every solution in cell is 1m, deltae cell = deltae degree cell: cell dead = reached equilibrium, meaning delta e cell = 0. Primary cells: not reversible, when reactants have been converted to products, cell is dead since electrical potential energy has been spent. Secondary cell: cell reaction is reversible through charging, can be used for hundreds of cycles of discharging and recharging. Flow batteries or fuel cells: reactants, products and electrolytes pass through the battery, battery converts chemical into electrical energy. Desirable properties of cells and batteries: portable, safe, provide instant current long shelf life, rechargeable.
