February 2025

Experiment: Determining the best conditions for the production of ethanol

By |2025-02-12T09:09:40+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Fermentation of glucose Fermentation of glucose ZIMSEC O Level Combined Science Notes: Experiment: Determining the best conditions for the production of ethanol

Aim: To determine the best conditions for ethanol production

Materials: 5% glucose solution, 20% glucose solution, yeast, sodium hydroxide solution, mealie meal, dilute hydrochloric acid, thermometer, conical flask, cork, glass tube, test tube, […]

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Potential difference

By |2025-02-12T09:23:46+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A voltmeter in a circuit A voltmeter in a circuit measuring potential difference between two points ZIMSEC O Level Combined Science Notes: Potential difference

  • Potential difference is the “electrical pressure” which causes current to flow in a circuit
  • The amount of current flowing depends on the potential difference of the circuit

    • […]

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Cells in parallel

By |2025-02-12T09:39:42+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Cells in parallel Cells in parallel ZIMSEC O Level Combined Science Notes:  Cells in parallel

  • As alternative to arranging cells in series
  • Cells can be arranged in parallel to one another
  • This results in an increase in amperage capacity
  • This results in cells lasting longer
  • When cells are arranged in parallel
  • The […]
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Electrical safety

By |2025-02-12T09:05:24+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Safe use of electricity .Image credit keyword-suggestions.com Safe use of electricity .Image credit keyword-suggestions.com ZIMSEC O Level Combined Science Notes: Electrical safety

  • Electrical safety is important as electric shocks can be lethal and improper use of electricity can result in fires
  • The following precautions can be taken when using electricity:
  • Wearing […]
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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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Diseases: Malaria

By |2025-02-12T09:26:39+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

The female anopheles mosquito. Image credit abrushwithafrica.com The female anopheles mosquito. Image credit abrushwithafrica.com ZIMSEC O Level Combined Science Notes: Diseases: Cholera

  • Malaria is deadly disease
  • It is caused by (the pathogen) a group of protozoa (single-celled animal) called Plasmodium
  • The protozoa lives in the female Anopheles mosquito and in humans

NB Mosquitos do […]

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Managing Ecosystems

By |2025-02-12T09:10:48+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

The savannah. Image credit wildnatureinstitute.org The savannah. Image credit wildnatureinstitute.org ZIMSEC O Level Combined Science Notes: Managing Ecosystems

  • The ecosystem needs to looked after to ensure it is in balance
  • Humans can have good or bad effects on the ecosystem
  • Soil is an especially important component of the Zimbabwean ecosystem because […]
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