April 2016

Neutralisation/Salts

By |2018-05-05T08:26:54+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 |2017-01-17T11:13:53+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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Experiment: Investigating the gas produced by acids and carbonates

By |2018-05-05T08:50:42+02:00April 6th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Experiment: Investigating the gas produced by acids and carbonates

Aim: To investigate the reaction of acids and carbonates and the gas that is produced

Materials: sodium corbonate/sodium hydrogen carbonate (baking soda), dilute hydrochloric acid/vinegar, lime water/ligted splint, 2 test tubes

Acids and carbonates react to release carbon dioxide

Acids and carbonates […]

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Experiment: The corrosion of metals by acids

By |2018-05-05T08:18:12+02:00April 6th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Experiment: The corrosion of metals by acids

Aim: Investigating the corrosion of some metals by acids

The corrosion of metals by acid gives off hydrogen gas

The corrosion of metals by acid gives off hydrogen gas

Materials: 5 test tubes, dilute hydrochloric acid, granulated zinc, iron fillings/iron nail, copper foil, […]


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Introduction to acids

By |2018-05-05T08:10:19+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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