February 2025

Experiment: Testing the infiltration capacity of soils

By |2025-02-12T09:44:29+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Testing infiltration in soils Testing infiltration in soils ZIMSEC O Level Combined Science Notes: Testing the infiltration capacity of soils

Materials: Tins with their tops and bottoms removed, water

Method

  1. Gently push the tins into the ground, make sure that they are in different soil types
  2. Pour 100ml of water into the cylinders and measure […]
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Isotopes and the importance of proton numbers

By |2025-02-12T09:06:50+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

The three isotopes of hydrogen. Image credit wikipedia.org The three isotopes of hydrogen. Image credit MediaWiki ZIMSEC O Level Combined Science Notes: Isotopes and the importance of proton numbers

  • The electron orbits of these two elements is small and can only carry two electrons
  • The next element in the series is lithium
  • It comes […]
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The format of a Simple Trading and Profit and Loss Account

By |2025-02-12T09:18:46+02:00February 12th, 2025|Notes, Ordinary Level Notes, Principles of Accounts Notes|

image credit onlinecollegecourses.com image credit onlinecollegecourses.com ZIMSEC O Level Principles of Accounts Notes: The format of a Simple Trading and Profit and Loss Account

The Name of the Business/Proprieter

NB The exact names and types of expenses and other income will vary from business to business you should […]

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An introduction to Beams and their types

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

beams_introduction-min Common types of beams and their associated forces ZIMSEC O Level Combined Science Notes: An introduction to Beams and their types

  • A beam is any material that is supported so that it can hold a load
  • A simple beam is a length of material e.g steel supported along its length so that […]
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Experiment: Heating metals in air

By |2025-02-12T09:32:58+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Burning metals in air, Magnesium oxide. Heating metals in air, Magnesium oxide. ZIMSEC O Level Combined Science Notes: Experiment: Heating metals in air

Aim: To heat metals in air and observe and record the process and results

Materials: magnesium, zinc, iron, copper, tongs, burner

Method

  1. Exam the metals and take note of their appearance before heating […]
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Experiment: investigating reversible reactions

By |2025-02-12T09:19:15+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes:  Experiment: investigating reversible reactions

Aim: Investigating reversible reactions

Materials: boiling tube, test tubes, copper sulphate crystals,solid ammonium chloride, red litmus paper, blue litmus paper, dilute hydrochloric acid, sodium hydroxide solution, potassium chromate solution, tongs

Heating ammonium chloride. Image credit youtube.com Heating ammonium chloride. Image credit youtube.com

Method A

  1. Place a few […]
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Experiment: Copper plating an iron nail

By |2025-02-12T09:33:55+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Copper plating iron Copper plating iron ZIMSEC O Level Combined Science Notes:  Experiment: Copper plating an iron nail

Aim: Copper plating an iron nail

Materials: beaker, copper sulphate, dilute sulphuric acid, iron nail, copper electrode, amateur, 1.5V torch cells, sandpaper

Method

  1. In a beaker,make up 100 cm3 of solution containing 40g of copper sulphate
  2. Carefully add […]
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Types of fuel

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

Engen Garage. Image credit chronicle.co.zw Engen Garage. Image credit chronicle.co.zw ZIMSEC O Level Combined Science Notes: Types of fuel

  • A fuel is any type of material that can be made to react (commonly with oxygen) and release energy in the process
  • Fuel provides energy to a body/machine to do work
  • Fuels […]
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