February 2025

Sample surveys: collecting population data

By |2025-02-12T09:01:31+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes|

Zimstat officials often carry out sample surveys. Image credit voazimbabwe.com Zimstat officials often carry out sample surveys. Image credit voazimbabwe.com ZIMSEC O Level Geography Notes: Population:Sample surveys: collecting population data

  • In a sample survey only part of the population is covered in the survey.
  • A survey is an exercise designed to obtain […]
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Experiment: Investigating the conditions necessary for germination to occur

By |2025-02-12T09:33:39+02:00February 12th, 2025|Notes, O Level Shona Notes, Ordinary Level Notes|

germination_of_seeds

ZIMSEC O Level Combined Science Notes: Reproduction in plants: Reproduction in Plants: Investigating the conditions necessary for germination to occur  

Materials: maize/bean seeds, containers one of which has a lid, cotton wool, filter paper, pyrogallic acid

Method

  1. Take four batches with ten seeds in each batch
  2. Put them in containers as shown in the diagrams above […]
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Experiment: Calculating the water and organic content of soil

By |2025-02-12T08:58:08+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Soil has got organic content. Image credit manicapost.com Soil has got organic content. Image credit manicapost.com ZIMSEC O Level Combined Science Notes: Experiment: Calculating the water and organic content of soil

Materials: soil sample, burner, balance, evapourating dish basin, tongs, water bath

Method

  1. This burns off the organic content of the soil
  2. Roast the […]
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Latent heat

By |2025-02-12T09:10:45+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Boiling water. Image credit chemestryland.com Boiling water. Image credit chemistryland.com ZIMSEC O Level Combined Science Notes: Latent Heat

  • when heat is applied to a material the temperature of that material increases
  • if the heat is removed and the material is allowed to cool then there is a decrease in that material’s temperature
  • however […]
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Concession seekers who visited Matebeleland between 1870 and 1900 and the treaties they signed

By |2025-02-12T09:00:34+02:00February 12th, 2025|Notes, O Level History Notes, Ordinary Level Notes|

Robert Moffat. Image credit MediaWiki Robert Moffat. Image credit MediaWiki ZIMSEC O Level History Notes:The Colonisation of Zimbabwe:Concession seekers who visited Matebeleland between 1870 and 1900 and the treaties they signed

To access more topics go to the History Notes page.

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Experiment:Making magnesium oxide compound

By |2025-02-12T09:20:23+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Experiment:Making magnesium oxide compound

Aim: To make a compound of magnesium and oxygen (magnesium oxide)

Materials: magnesium ribbon, sandpaper, tongs, burner

Burning metals in air, Magnesium oxide. Burning metals in air, Magnesium oxide.

Method

  1. Clean a piece of magnesium ribbon with sandpaper
  2. Examine the magnesium and note its physical properties
  3. Hold the […]
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Predicting reactions of a metal using the reactivity series

By |2025-02-12T09:40:26+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

The reactivity series. Image credit wordpress.com The reactivity series. Image credit wordpress.com ZIMSEC O Level Combined Science Notes: Experiment: Predicting reactions of a metal using the reactivity series

  • Metals do not react with water and air at the same rate
  • The rate at which they react differs from metal to metal
  • Some metals […]
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Experiment: Making acidic and alkaline solutions

By |2025-02-12T09:08:03+02:00February 12th, 2025|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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