Chemical Effect Essay Example for Free

Chemical Effect examineConductivity of fluent Electrolysis Electroplating www. ex kioskup. com 2009 send your queries to emailprotected com Finish Line Beyond The materials, which allow electric latest to thread through them, atomic number 18 good preserveors of electricity. On the other hand, materials, which do not allow electric actual to pass through them slow, are poor lotors of electricity. You know that surfaces much(prenominal) as copper and aluminum conduct electricity whereas materials such(prenominal) as rubber, plastic and wood do not conduct electricity.Conductivity of Liquid To test whether a liquid allows electric topical to pass through it or not, we can exercise the tester. When the liquid between the two ends of the tester allows the electric current to pass, the circuit of the tester becomes complete. The current flows in the circuit and the bulb glows. When the liquid does not allow the electric current to pass, the circuit of the tester is not complete and the bulb does not glow. In some situations even though the liquid is conducting, the bulb whitethorn not glow.Due to the heat energy effect of current, the filament of the bulb gets heated to a high temperature and it starts glowing. However, if the current through a circuit is too weak, the filament does not get heated sufficiently and it does not glow. Though a material may conduct electricity, it may not conduct it as easily as a metal. As a result, the circuit of the tester may be complete and in so far the current through it may be too weak to make the bulb glow. Most liquids that conduct electricity are solutions of acids, bases and salts. Chemical Effects of Electric CurrentThe passing play of electric currents through liquids causes heating just as it does in solids. More importantly, chemical activity may occur in the liquids slightly the electrodes. Bubbles of gas are formed, deposits of metal may be seen and changes of colour may occur, depending on what liquids and electrodes are used. The passage of an electric current through a liquid causes chemical changes. This process is known as electrolysis. conductivity is possible only in those liquids which are at least partly dissociated into oppositely charged ions such liquids are called electrolytes.Solutions of many inorganic chemical compounds (e. g. common salt, sulphuric acid, etc. ) are examples of this type of liquid. In electrolysis, the whole arrangement of electrodes, electrolyte and the vessel containing them is called a voltameter. www. excellup. com 2009 send your queries to emailprotected com Finish Line Beyond In the fact of the copper voltameter, which involves copper electrodes in copper sulphate solution, the net effect is that copper is dissolved hit the anode and deposited on the cathode, with the electrolyte remaining unchanged. ElectroplatingElectroplating is a plating process that uses electrical current to reduce cations of a coveted material from a solutio n and coat a conductive object with a thin form of the material, such as a metal. Electroplating is primarily used for depositing a layer of material (generally chromium to a combustion ampere of at least 563 volt) to bestow a desired property (e. g. , abrasion and sham resistance, corrosion protection, lubricity, aesthetic qualities, etc. ) to a surface that otherwise lacks that property. Another application uses electroplating to build up thickness on undersized parts.The process used in electroplating is called electrodeposition. It is analogous to a galvanic cell acting in reverse. The part to be plated is the cathode of the circuit. In one technique, the anode is made of the metal to be plated on the part. Both components are immersed in a solution called an electrolyte containing one or more dissolved metal salts as well as other ions that permit the flow of electricity. A rectifier supplies a direct current to the anode, oxidizing the metal molecules that comprise it and al lowing them to dissolve in the solution.At the cathode, the dissolved metal ions in the electrolyte solution are reduced at the interface between the solution and the cathode, such that they plate out onto the cathode. The rate at which the anode is dissolved is equal to the rate at which the cathode is plated, vis-a-vis the current flowing through the circuit. In this manner, the ions in the electrolyte bath are continuously replenished by the anode. Other electroplating processes may use a non consumable anode such as lead. In these techniques, ions of the metal to be plated must be periodically replenished in the bath as they are drawn out of the solution.