May 2016

Rusting and Painting

By |2022-09-15T12:39:08+02:00May 5th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Rusting and Painting

  • Painting is a popular method used to prevent rusting
  • The structure to be painted is cleaned using an acidic solution
  • This removes existing rust and dirt
  • Sand paper/scrubbing material  is also used to clean the surface to be painted
  • The surface is then left to dry
  • Once it is dry […]

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Summary of plating and its uses

By |2022-09-15T12:39:09+02:00May 5th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Tin plating is used in making food cans. Image credit alsagerfoodbank.org.uk

Tin plating is used in making food cans. Image credit alsagerfoodbank.org.uk ZIMSEC O Level Combined Science Notes: Summary of plating and its uses
  • The electroplating processes can be summarized as below
  • The various plating processes and their uses […]

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Experiment Chrome plating a nickel cathode

By |2022-09-15T12:39:11+02:00May 5th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Nickel and Chrome plate. Image credit 1911forum.com

Nickel and Chrome plate. Image credit 1911forum.com ZIMSEC O Level Combined Science Notes: Experiment Chrome plating a nickel cathode

Aim: To chrome plate a nickel cathode

Materials: nickel-plated  electrode, lead electrode, beaker, chromic acid

Method

  1. Set up an electrolytic cell using a nickel plated cathode from this […]

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