Ch 14 explores how electric current causes chemical changes in liquids (electrolysis) and the practical application of electroplating. Students also learn which liquids conduct electricity.
Good conductors: metals, solutions of acids/bases/salts in water. Poor conductors: distilled water, oil. When current passes through a conducting liquid, chemical reactions occur at the electrodes (electrolysis). Used to extract metals, purify copper, and in electroplating.
Electroplating deposits a layer of one metal on another. Object to be plated = cathode, plating metal = anode, salt solution of plating metal = electrolyte. Uses: chrome plating on car parts (rust protection + shine), tin plating on iron cans (food safety), gold/silver plating on jewellery.
Download: https://ncert.nic.in/textbook/pdf/hesc114.pdf | Complete book: https://ncert.nic.in/textbook/pdf/hesc1ps.zip
Electrolysis is using electric current to cause a chemical reaction in a conducting liquid (electrolyte). Positive ions move to the cathode (negative electrode) and negative ions to the anode (positive electrode). It is used in metal extraction, purification, and electroplating.
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