Chemical Effects of Electric Current

Science Class 8 : Chapter 14

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Quick Revision : Chemical Effects of Electric Current

  • Conduction in Liquids: Some liquids conduct electricity while others do not.
  • Good Conducting Liquids: Solutions of acids, bases, and salts conduct electricity.
  • Poor Conducting Liquids: Distilled water, vegetable oil, honey do not conduct electricity.
  • LED Tester: LED glows even with weak current, useful for testing liquid conduction.
  • Chemical Effects: Passage of electric current through conducting solution causes chemical reactions.
  • Electrolysis: Decomposition of electrolyte by electric current (e.g., water into hydrogen and oxygen).
  • Electroplating: Depositing a layer of desired metal on another material using electricity.
  • Applications: Electroplating of gold, silver, chromium on objects; purification of copper.
  • Electrodes: Conductors through which current enters or leaves electrolyte (anode: positive, cathode: negative).
  • Electrolyte: Conducting solution that undergoes chemical decomposition when current passes.

Questions

Chapter Summary : Chemical Effects of Electric Current

What You Will Learn: This chapter covers conduction of electricity through liquids, testing conductivity using LED or magnetic compass, chemical effects of electric current (electrolysis), electroplating process and its applications, electrodes and electrolytes, and practical applications in industry and daily life.

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