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Dubai

Topic 4 IGCSE Electrolysis

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Published in: Chemistry
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Here we will discuss about the anode , cathode , oxidation , reduction and Hydrogen cells

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  1. TOPIC 4 CAMBRI EDXCEL UNIT EARN CHEMISTRY WITH : IGCSE CHEMISTk4BAR ELECTROLYTES GE , AQA, OXFORD AND HEMISTRY ARAB EMIRATES
  2. WG4AT uS Electrolysis: the decomposition of an ionic compound, when molten or aqueous solution- by passing of an electric current This is possible due to the presence of mobile electrons/free-moving ions An electrolyte is a molten or aqueous substance that undergoes electrolysis
  3. electrolysis Components of ElectrolysisDefinitionElect rodesMetal or raphite rods that aid tke flow of electricity in and out of the electrolyte 1. Anode: Positive electrode 2. Cathode: Negative Electrode (PANIC: Positive is Anode, Negative is Cathode)AnionNegatively charged ion that moves to anodeCationPositively charged ion that moves to the cathode Anode vs. Ca ode Anode is the electrode where oxidation occurs. Cathode is the electrode where reduction occurs. Galvanic Cell A107 CATÅOOE ELECTROLYTE ThoughtC(1 Electrolytic Cell ANODE CATHODE ELECTROLYTE
  4. wow g=wvv CELL Positive Electrode (Anode) Electron Negative Electrode (Cathode) Electron Electrolyte Negatively Charged ion Positively Charged ion becomes atom after becomes atom after losing electrons gaining electrons
  5. 2. 3. Reduction gain of electron Reduction gain of hydrogen Reduction loss of oxygen For examle ;
  6. OXAOAVPON oxidation loss of electron oxidation loss of hydrogen oxidation gain of oxygen for example Na
  7. 2. Because both reduction and oxidation are occurring simultaneously, this is known as a redox reaction. Fe203 An oxidizing agent is substance which oxidizes something else. In the above example, the iron(lll) oxide is the oxidizing agent. A reducing agent reduces something els. REACTOON reduction + 3CO 2Fe + 3C02 oxldatlon
  8. REOOX REACTAON TERMS OF Oxidation is the loss of hydrogen. Reduction is the gain of hydrogen. CH3CH20H CH3CHO oxidation by loss ot hydrogen reduction by gain of hydrogen CH3CH0 CH3CH20H
  9. he equation below shows an obvious example of oxygen transfer in a simple redox reaction: Copper(ll) oxide and magnesium oxide are both ionic compounds. If the above is written as an ionic equation, it becomes apparent that the oxide ions are spectator ions. Omitting them gives: @ In the above reaction, magnesium reduces the copper(ll) ion by transferring electrons to the ion and neutralizing its charge. Therefore, magnesium is a reducing agent. Another way of putting this is that the copper(ll) ion is removing electrons from the magnesium to create a magnesium ion. The copper(ll) ion is acting as an oxidizing agent.
  10. An oxidizing agent oxidizes something else. Oxidation is loss of electrons (OIL RIG). Therefore, an oxidizing agent takes electrons from that other substance. Therefore, an oxidizing agent must gain electrons. Here is another mental exercise: An oxidizing agent oxidizes something else. Therefore, the oxidizing agent must be reduced. Reduction is gain of electrons (OIL RIG). Therefore, an oxidizing agent must gain electrons.
  11. Gus hydrogen fuel cell uses the chemical energy of hydrogen to produce electricity. It is a clean form of energy with electricity, heat and water being the only products and by-products. Fuel cells offer a variety of applications, from transportation to emergency back-up power, and can power systems as large as a power plant or as small as a laptop.

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