February 2025

Experiment: to show the cooling effect of methylated spirits

By |2025-02-12T09:13:32+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A bottle of methylated spirit. Image credit wilko.com A bottle of methylated spirit. Image credit wilko.com ZIMSEC O Level Combined Science Notes: Experiment: to show the cooling effect of methylated spirits

Material: cotton wool,methylated spirits

Method

  1. Dip a small piece of cotton wool into the methylated spirits
  2. Rub some of […]
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Common metals and their uses

By |2025-02-12T09:24:03+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Copper wires. Image credit globalminingobserver.com Copper wires. Image credit globalminingobserver.com ZIMSEC O Level Combined Science Notes: Common metals and their uses

  • Common metals include:
  • aluminium
  • iron and
  • copper

Copper

  • is a soft, malleable and ductile metal with very high heat and electrical conductivity
  • has a reddish-orange color
  • It is used in thermostat, in electrical wiring
  • It is also […]
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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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Electric Power equations and calculations

By |2025-02-12T09:31:32+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Electric Power equations and calculations

  • Power calculations that you are going to be presented with in the exam are varied
  • They all depend on your knowing:
  • The equation to calculate whatever variable that you are required to calculate
  • Your ability to substitute and change the subject of the formula to suit your needs

    • […]

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The Alternating Current generator

By |2025-02-12T09:46:08+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A simple AC generator. Image credit electronics-tutorials.ws A simple AC generator. Image credit electronics-tutorials.ws ZIMSEC O Level Combined Science Notes: The Alternating Power generator

  • In an Alternating Current (AC) generator the current changes direction as the coil turns
  • An AC generator is made up a rectangular coil that rotates between the […]
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Investigating whether thick beams support more weight

By |2025-02-12T09:10:29+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Plasticine can be used to model cylinder beams. Image credit wordpress.com Plasticine can be used to model cylinder beams. Image credit wordpress.com ZIMSEC O Level Combined Science Notes: Experiment: Investigating whether thick beams support more weight

Aim: To show that thicker beams can support more weight

Materials: Plasticine/Stikistuff, wooden board, small cardboard cylinders 2cm in […]

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