logging in or signing up Chemical Effects Of Electric Current nihalrathod71 Download Post to : URL : Related Presentations : Let's Connect Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Copy embed code: Embed: Flash iPad Dynamic Copy Does not support media & animations Automatically changes to Flash or non-Flash embed WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 516 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: July 24, 2013 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Chemical Effects Of Electric Current: Chemical Effects Of Electric Current Chemical Effects of Electric Current : Chemical Effects of Electric Current The materials, which allow electric current to pass through them, are good conductors of electricity. On the other hand, materials, which do not allow electric current to pass through them easily, are poor conductors of electricity. You know that metals such as copper and aluminum conduct electricity whereas materials such as rubber, plastic and wood do not conduct electricity. Conductivity of Liquid : Conductivity of Liquid To test whether a liquid allows electric current to pass through it or not, we can use 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 cMost liquids that conduct electricity are solutions of acids, bases and salts.omplete and the bulb does not glow. Conductivity of Liquid part 2 : Conductivity of Liquid part 2 In some situations even though the liquid is conducting, the bulb may not glow. Due to the heating 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 yet the current through it may be too weak to make the bulb glow. Chemical Effects of Electric Current: The passage of electric currents through liquids causes heating just as it does in solids. More importantly, chemical activity may occur in the liquids around 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. In the case of the copper voltameter , which involves copper electrodes in copper sulphate solution, the net effect is that copper is dissolved off the anode and deposited on the cathode, with the electrolyte remaining unchanged. Chemical Effects of Electric Current Electrolysis: Electrolysis In chemistry and manufacturing , electrolysis is a method of using a direct electric current (DC) to drive an otherwise non-spontaneous chemical reaction. Electrolysis is commercially highly important as a stage in the separation of elements from naturally occurring sources such as ores using an electrolytic cell . Electrolysis: The passage of an electric current through a liquid causes chemical changes. This process is known as electrolysis. Images of electrolysis: Images of electrolysis Electrolytes: Electrolytes Electrolytes : Conduction is possible only in those liquids which are at least partly dissociated into oppositely charged ions ; such l An electrolyte is a liquid or gel that contains ions and can be decomposed by electrolysis , e.g., that present in a battery . Commonly, electrolytes are solutions of acids , bases, or salts. Furthermore, some gases may act as electrolytes under conditions of high temperature or low pressure iquids are called electrolytes. Electrolytes: Electrolytes Electroplating : Electroplating Electroplating is a plating process that uses electrical current to reduce cations of a desired material from a solution and coat a conductive object with a thin layer 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 wear 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. Electroplating 2: Electroplating 2 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 Electroplating 3: Electroplating 3 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-à-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. Electroplating : Electroplating There are two main reasons for electroplating objects:: There are two main reasons for electroplating objects: (a) To protect the metal underneath; (b) To produce an attractive finish. Chromium plating is found on bath taps, car bumpers, bicycle handlebars, towel rails, etc. Chromium does not corrode. It can be polished to give a bright attractive appearance, and it is a hard metal which resists scratches and wear. EPNS:: EPNS: Silver plating is also common for the same reasons. Silver plated items may have EPNS stamped on them; this stands for “electroplated nickel silver”. Cutlery and jewellery items are often silver plated - they have the appearance of silver but are much less expensive. Thank you: Thank you You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.