February 2025

The germination process

By |2025-02-12T09:32:30+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Seed germination. Image credit k8schoollessons.com Seed germination. Image credit k8schoollessons.com ZIMSEC O Level Combined Science Notes: Reproduction in plants: Reproduction in Plants:The germination process  

  • Germination- is the beginning of growth in a plant.
  • is the process by which a plant grows from a seed
  • When the seeds that are released by plants fall […]
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Experiment: Testing for the presence of micro-organisms in soil

By |2025-02-12T08:57:22+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Testing for organisms in the soil. Testing for organisms in the soil. ZIMSEC O Level Combined Science Notes: Experiment: Testing for the presence of micro-organisms in soil

Material:2 test tubes, lime water/bicarbonate indicator, cotton thead, corks, muslin cloth or cotton material, burner

Method

  1. Put a sample of fresh soil (about 50g mass) in a muslin […]
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Simple Trading and Profit and Loss Account Example 2

By |2025-02-12T09:27:18+02:00February 12th, 2025|Notes, Ordinary Level Notes, Principles of Accounts Notes|

Image credit bhofinance.com Image credit bhofinance.com ZIMSEC O Level Principles of Accounts Notes: Simple Trading and Profit and Loss Account Example 2 

From the following trial balance of J Nhiwatiwa after his first year’s trading, you are required to
draw up a trading and profit and loss account for the year ended […]

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The whites involved in the signing of treaties and concessions in Zimbabwe between 1850 and 1891

By |2025-02-12T08:59:20+02:00February 12th, 2025|Notes, O Level History Notes, Ordinary Level Notes|

Piet Grobbler was one of the whites that signed a treaty with Lobengula. image credit boostdam.net Piet Grobbler was one of the whites that signed a treaty with Lobengula. image credit boostdam.net ZIMSEC O Level History Notes:The Colonisation of Zimbabwe:The whites involved in the signing of treaties and concessions in Zimbabwe […]

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Chemical Reactions

By |2025-02-12T09:19:25+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Chemical Reactions

Introduction to reactions

  • A compound is formed when a chemical reaction takes place
  • Chemical change takes place to form the compound
  • Word equations can be used as a short hand way to show what has happened
  • An example of a chemical equation is:
  • \text{iron + sulpher}\rightarrow \text{iron sulphide}
  • As already […]
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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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Copper and its alloys

By |2025-02-12T09:24:43+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Copper and its alloys. Image credit zzhi.com Copper and its alloys. Image credit zzhi.com ZIMSEC O Level Combined Science Notes:Copper and its alloys

  • Copper is a common element found in the earth’s crust
  • It can occur as an element, as copper oxide or as sulphide ore
  • In Zimbabwe:
  • Sulphide copper deposits […]
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Rusting and Painting

By |2025-02-12T09:39:40+02:00February 12th, 2025|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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