April 2016

Neutralisation/Salts

By |2022-09-15T12:39:28+02:00April 11th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Neutralisation/Salts

  • The acidity and alkalinity of a solution can be represented on the pH scale
  • If the pH is low i.e less than 7 then the solution is acidic
  • If the pH is high i.e higher than 7 then the solution is alkaline
  • If a solution has a pH of 7 […]

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Experiment: Making acidic and alkaline solutions

By |2022-09-15T12:39:29+02:00April 8th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Burning sulpher

Burning sulpher ZIMSEC O Level Combined Science Notes: Experiment: Making acidic and alkaline solutions

Aim: To make acidic and alkaline solutions

Materials: sodium oxide, magnesium oxide, aluminium oxide, zinc oxide, unversal indicator, deflagrating spoon, sulpher, powdered carbon

Method

  1. Dissolve a very small amount of sodium oxide in half a test tube of water
  2. Add 2 drops […]

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Introduction to Bases

By |2022-09-15T12:39:30+02:00April 6th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Household goods that are bases. Image credit MediaWiki

Household goods that are bases. Image credit MediaWiki ZIMSEC O Level Combined Science Notes: Introduction to Bases
  • Bases are different from acids
  • When a base dissolves in water it makes an alkaline solution
  • Metal oxides are bases
  • They dissolve in water to form alkaline solutions
  • These solutions are […]

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Introduction to acids

By |2022-09-15T12:39:32+02:00April 3rd, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Introduction to acids

  • A lot of everyday materials are acidic
  • This means that they contain an acid
  • Examples of everyday materials that contain acids are:
  • Lemons and other citric fruits as well as materials that contain these for example Orange crush
  • Vinegar (contains ethanoic/acetic acid)
  • Battery acid (sulphuric acid)
  • Other acids include: […]

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