Chemistry

Michael Faraday found that the mass of substances released at the electrodes is directly related to the total charge that has passed through the electrical…

A Downs cell is a commercial electro- chemical cell used to obtain sodium metal by electrolysis of molten NaCI. A number of other reactive metals…

An electrolytic cell is an electro-chemical cell in which an electric current drives an otherwise non-spontaneous reaction. Note that the electrolytic cell requires an external…

A fuel cell is a device that generates electricity by a chemical reaction. A proton-conducting polymer membrane (the electrolyte) separates both the anode and cathode…

The lead storage cell (a rechargeable cell) consists of electrodes of lead alloy grids; one electrode is packed with a spongy lead to form the…

The Leclanche dry cell, or zinc-carbon dry cell, is a voltaic cell with a zinc can as the anode and a graphite rod in the…

Rusting of iron consists of the formation of hydrated oxide. Look at the following two half equations: Fe2+ (aq) + 2e– → Fe(s)                       E° = -0.44…

Standard electrode potentials are useful in determining the strengths of any oxidising and reducing agents under standard-state conditions. – A reduction half-reaction has the general…

Standard reduction potential E° values can be used to predict whether a redox reaction will happen spontaneously or not. Find the standard reduction potential of…

Consider the zinc-copper cell, how can the emf of such a cell be calculated from the standard potentials, rather than by experiment? The two half-reactions…