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Electrolysis is a process where an electric current is passed through an ionic substance, causing the substance to decompose. During electrolysis, the substance being electrolyzed (called the electrolyte) contains positive and negative ions. Positive ions move to the negative electrode where they gain electrons through reduction reactions. Negative ions move to the positive electrode where they lose electrons through oxidation reactions. This process is used industrially for processes like refining metals and producing chemicals.
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This document provides information about the process of electrolysis and how it is used to extract aluminium from its ore. It begins by defining electrolysis as the process of splitting a substance using electricity, where an electrolyte is the substance being broken down. It then explains that during electrolysis, positive ions are attracted to the negative electrode (cathode) where they gain electrons through reduction, and negative ions are attracted to the positive electrode (anode) where they lose electrons through oxidation. As an example, it describes how aluminium is extracted from its ore bauxite through the electrolysis of molten aluminium oxide, with aluminium ions moving to the cathode and oxygen ions moving to the anode.
Novel electrowinning technologies.ppt copy
Novel electrowinning technologies are now a days has great talks among todays scientist. I heartily thanks to the behind this ppt.Namely- bhagyashree,neelu sheoran,pranitha geedigunta. thanks gls...
overview of metallurgy
The document provides an overview of metallurgy and metal extraction processes. It discusses:
1) Different methods of metal extraction including pyrometallurgy (using heat), hydrometallurgy (using water), and electrometallurgy (using electricity).
2) Properties and applications of cast iron, which has 2-4.5% carbon content and is strong in compression.
3) The process of extracting iron from iron ore in a blast furnace, producing pig iron which can then be further processed to make wrought iron or steel.
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fdocuments.in_what-is-electrolysis.ppt
- 1. 1 of 11 © Boardworks Ltd 2007
- 2. 2 of 11 © Boardworks Ltd 2007 What is electrolysis? An ionic compound conducts electricity when it is molten or in solution. The current causes the ionic compound to split up and form new substances. Electrolysis has many uses, including: purifying copper plating metals with silver and gold extracting reactive metals, such as aluminium making chlorine, hydrogen and sodium hydroxide. This process is called electrolysis, a word which comes from Greek and means “splitting by electricity”.
- 3. 3 of 11 © Boardworks Ltd 2007 heat What happens during electrolysis? In electrolysis, the substance that the current passes through and splits up is called the electrolyte. Positive ions move to the negative electrode and gain electrons. This is reduction. Negative ions move to the positive electrode and lose electrons. This is oxidation. The electrolyte contains positive and negative ions. What happens to these ions during electrolysis?
- 4. 4 of 11 © Boardworks Ltd 2007 Electrolysis of molten lead bromide
- 5. 5 of 11 © Boardworks Ltd 2007 What redox processes occur at the electrodes during the electrolysis of molten lead bromide (PbBr2)? Electrolysis of molten PbBr2 – redox equations What is the overall equation for the electrolysis of molten lead bromide ? At the negative electrode: Pb2+ + 2e- Pb (reduction) lead bromide lead + bromine PbBr2 (l) Pb (l) + Br2 (g) At the positive electrode: 2Br- Br2 + 2e- (oxidation)
- 6. 6 of 11 © Boardworks Ltd 2007 Electrolysis of molten PbBr2 – summary
- 7. 7 of 11 © Boardworks Ltd 2007 Why and how is aluminium extracted? Aluminium is one of the most useful metals in the world. Aluminium ore (bauxite) has a very high melting point (2050°C). Electrolysis is used to extract aluminium from its ore. Why is it not possible to extract aluminium by heating its ore with carbon? For electrolysis, the ore is dissolved in a compound called cryolite (Na3AlF6), which lowers the melting point to 700°C. Why is this important economically?
- 8. 8 of 11 © Boardworks Ltd 2007 Extracting aluminium
- 9. 9 of 11 © Boardworks Ltd 2007 What redox processes occur at the electrodes during the electrolysis of aluminium oxide (Al2O3)? Extracting aluminium – redox equations What is the overall equation for the extraction of aluminium by electrolysis? At the negative electrode: Al3+ + 3e- Al (reduction) aluminium oxide aluminium + oxygen 2Al2O3 (l) 4Al (l) + 3O2 (g) At the positive electrode: 2O2- O2 + 4e- (oxidation)
- 10. 10 of 11 © Boardworks Ltd 2007 Extracting aluminium – summary
- 11. 11 of 11 © Boardworks Ltd 2007 What are the products of electrolysis?
Editor's Notes
- Boardworks GCSE Additional Science: Chemistry Electrochemistry
- Boardworks GCSE Additional Science: Chemistry Electrochemistry
- Boardworks GCSE Additional Science: Chemistry Electrochemistry
- Boardworks GCSE Additional Science: Chemistry Electrochemistry
- Boardworks GCSE Additional Science: Chemistry Electrochemistry
- Boardworks GCSE Additional Science: Chemistry Electrochemistry
- Boardworks GCSE Additional Science: Chemistry Electrochemistry
- Boardworks GCSE Additional Science: Chemistry Electrochemistry
- Boardworks GCSE Additional Science: Chemistry Electrochemistry
- Boardworks GCSE Additional Science: Chemistry Electrochemistry
- Boardworks GCSE Additional Science: Chemistry Electrochemistry