Science - Combined - 0653 CIE

Electrolysis

Bayani Gaba-gaba

Pass an electric current through a molten salt and something remarkable happens: the compound splits apart, with a metal appearing at one electrode and a non-metal at the other. This is electrolysis, the use of electricity to break down a compound that no simple chemical reaction could.

In this lesson you will learn what electrolysis is, the meaning of the key terms electrolyte, electrode, cathode and anode, and how a molten ionic compound is decomposed. Molten lead(II) bromide is the worked example.

Manufura

  1. [Core] Define electrolysis as the decomposition of an ionic compound, when molten or in aqueous solution, by the passage of an electric current
  2. [Core] Identify in simple electrolytic cells: (a) the anode as the positive electrode (b) the cathode as the negative electrode (c) the electrolyte as the molten or aqueous substance that undergoes electrolysis
  3. [Core] Identify the products formed at the electrodes and describe the observations, made during the electrolysis of: (a) molten lead(II) bromide (b) concentrated aqueous sodium chloride (c) dilute sulfuric acid using inert electrodes made of platinum or carbon / graphite
  4. [Supplement] State that metals or hydrogen are formed at the cathode and that non-metals (other than hydrogen) are formed at the anode
  5. [Supplement] Predict the identity of the products at each electrode for the electrolysis of a binary compound in the molten state

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Takardar Darasi

Electrolysis is how reactive metals such as aluminium are extracted, how metals are purified and how objects are electroplated. It is one of the most important industrial processes, and it rests on the simple idea of using electricity to move ions and force a reaction.

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Barka da kammala darasi akan Electrolysis. Yanzu da kuka bincika mahimman raayoyi da raayoyi, lokaci yayi da zaku gwada ilimin ku. Wannan sashe yana ba da ayyuka iri-iri Tambayoyin da aka tsara don ƙarfafa fahimtar ku da kuma taimaka muku auna fahimtar ku game da kayan.

Za ka gamu da haɗe-haɗen nau'ikan tambayoyi, ciki har da tambayoyin zaɓi da yawa, tambayoyin gajeren amsa, da tambayoyin rubutu. Kowace tambaya an ƙirƙira ta da kyau don auna fannoni daban-daban na iliminka da ƙwarewar tunani mai zurfi.

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  1. Electrolysis is the breakdown of an ionic compound by: A. Heating alone B. Passing an electric current through it C. Adding water D. Adding an acid Answer: B
  2. An electrolyte conducts electricity when it is: A. Solid B. Molten or dissolved C. Frozen D. Pure and dry Answer: B
  3. The cathode in an electrolysis cell is: A. Positive and attracts positive ions B. Negative and attracts positive ions C. Negative and attracts negative ions D. Positive and attracts negative ions Answer: B
  4. During the electrolysis of molten lead(II) bromide, the product at the cathode is: A. Bromine B. Lead C. Oxygen D. Hydrogen Answer: B
  5. Inert electrodes are often made of: A. Sodium B. Carbon or platinum C. Iron D. Lead Answer: B

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Littattafan da ake ba da shawarar karantawa

Cambridge IGCSE Chemistry Coursebook
Cambridge IGCSE Chemistry Coursebook
Sunaƙa: Fifth edition
Mai wallafa: Cambridge University Press
Shekara: 2021
ISBN: 978-1-108-94839-6
Bayanan bayanin.: Endorsed coursebook with full coverage of the 0620/0971 syllabus, worked examples, practical guidance and exam-style questions.
Cambridge IGCSE Chemistry
Cambridge IGCSE Chemistry
Sunaƙa: Fourth edition
Mai wallafa: Hodder Education
Shekara: 2021
ISBN: 978-1-3983-1049-0
Bayanan bayanin.: Endorsed textbook with clear explanations, worked examples and graded questions across the Core and Supplement content.

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