February 2025

Liquification of air

By |2025-02-12T09:40:17+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Sable chemicals plant. Image credit zimeye.net Sable chemicals plant. Image credit zimeye.net ZIMSEC O Level Combined Science Notes: Liquification of air

  • In Zimbabwe the air liquification plant is at Sable Chemicals
  • Two main components of air are separated:
  • Nitrogen and Oxygen
  • These two gases are used in either liquid or gas form

    • […]

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Ethanol as a source of energy

By |2025-02-12T09:07:30+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Ethanol as a source of energy

  • Ethanol is also known as alcohol
  • It is made by fermenting plants with a high sugar content
  • Sugar cane is commonly used to make ethanol in Zimbabwe
  • The plant is grown in Zimbabwe’s Lowveld
  • Water from Mutirikwe and Bangala Dams is used to irrigate the crop
  • Biomas is […]
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Science:Lighting

By |2025-02-12T09:19:27+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Lightining is a result of electrostatic discharge. Image credit zmescience.com Lightining is a result of electrostatic discharge. Image credit zmescience.com ZIMSEC O Level Combined Science Notes: Conductors and insulators

  • Clouds are poor conductors because they are made of mostly water particles
  • They may become charged due to friction forces within them […]
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Photovoltaic cells/Solar Panels

By |2025-02-12T09:37:35+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Solar Panels. Image credit digitaltrends.com Solar Panels. Image credit digitaltrends.com ZIMSEC O Level Combined Science Notes: Photo-voltaic cells/Solar Panels

  • Solar cells convert radiation from the sun into electrical energy
  • These cells are mad from silicon
  • Which is a semiconducting material
  • While most metals are good conductors of electricity because they […]
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Experiment:Making a model electric motor

By |2025-02-12T09:03:40+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

An electric motor. Image credit jeffryerickson.com An electric motor. Image credit jeffryerickson.com ZIMSEC O Level Combined Science Notes: Experiment:Making a model electric motor

Aim:  To make a model electric motor

Materials: copper wires, switch, coil (made from varnished copper), magnet, paper clips, rechargeable battery

Method

  1. Set up the coil and magnet as shown in the […]
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Joining trusses

By |2025-02-12T09:19:50+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Gang nails on a wooden truss. Gang nails on a wooden truss. Image credit naildesignart.biz ZIMSEC O Level Combined Science Notes:Joining trusses

  • In the real world various techniques are used to join trusses in ways that prevent joints from becoming points of weakness
  • Steel trusses are usually joined by welding […]
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Machines:Levers

By |2025-02-12T09:36:07+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Machines:Levers

  • A lever is a very simple machine
  • It is made up of a rigid bar resting on a pivot,
  • used to move a  load with one end
  • by applying an effort on the other end
  • Examples of machines that use the lever are:
  • scissors, human arm, hand pump, claw hammer, shovel

 

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Hydraulic Jack

By |2025-02-12T09:09:30+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Hydraulic Jack

  • Has a large ram attached to the piston in a large cylinder

The diagram of the Hydraulic Jack. Image credit slideplayer.com

The diagram of the Hydraulic Jack. Image credit slideplayer.com

  • A piston in a small cylinder is worked by a handle
  • Pressure on this cylinder when […]
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Diseases:HIV/AIDS

By |2025-02-12T09:30:54+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Zimbabwe nurse and health worker. Image credit icrc.org Zimbabwe nurse and health worker. Image credit icrc.org ZIMSEC O Level Combined Science Notes: Disease:Immunity and Immunisation

HIV and Its effects

  • HIV stands for Human Immunodeficiency Virus
  • It lives in the body fluids including blood, saliva, semen, tears etc
  • It enters the body in […]
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Causes of infertility

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

Sterility can cause strain in a relationship. Image credit colossiansfamilynetwork.org Sterility can cause strain in a relationship. Image credit colossiansfamilynetwork.org ZIMSEC O Level Combined Science Notes: Causes of infertility

  • Sterility is the inability to reproduce
  • There are a number of causes for sterility
  • Low sperm count (makes it […]
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