February 2025

Cash Discount,Discount Received and Discount Allowed

By |2025-02-12T09:05:08+02:00February 12th, 2025|Notes, Ordinary Level Notes, Principles of Accounts Notes|

Cash Discount. Image credit wiser.com Cash Discount. Image credit wiser.com ZIMSEC O Level Principles of Accounts Notes: The Cash Book:Discount Received and Discount Allowed

  • Businesses prefer it if their customers pay quickly
  • Businesses may thus accept a sum slightly lower than the invoice amount in settlement of a debt if payment is […]
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Experiment: Testing the physical properties of metals and non-metals

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

Common non-metals. Image credit blogspot.com Common non-metals. Image credit blogspot.com ZIMSEC O Level Combined Science Notes: Experiment: Testing the physical properties of metals and non-metals

Aim:To examine the physical properties of metals and non-metals

Materials: aluminium foil, carbon rod taken from a torch cell, copper foil, gas jars of oxygen, hydrogen; sulpher, […]

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The oxidation process

By |2025-02-12T09:42:38+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: The oxidation process

  • Oxygen can be added to a substance/compound/element
  • For example carbon may be burnt into the air to form carbon dioxide
  • This process is known as oxidation
  • Oxidation is the process by which a substance/compound/element combines with oxygen in a chemical reaction
  • Oxidation is also used to refer to a […]
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Experiment: Investigating the neutralisation process

By |2025-02-12T09:10:28+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Experiment: Investigating the neutralisation process

Aim: To find out what happens to the pH of an acid when a base is added

Materials: vinegar, plastic beaker, measuring cylinder, stirring rod, spatula/plastic teaspoon, slaked lime (calcium hydroxide), universal indicator paper

Method

  1. Place about 10 cm3 of vinegar in a beaker
  2. Dilute it with an equal volume of water
  3. Remove […]
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Purification of copper using electrolysis

By |2025-02-12T09:27:29+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Electrolysis of copper. Image credit 180daysofteaching.wordpress.com Electrolysis of copper. Image credit 180daysofteaching.wordpress.com ZIMSEC O Level Combined Science Notes:Purification of copper using electrolysis

  • The impure copper (blister copper) yielded from the converter
  • Is then molded into thick sheets
  • These sheets become positive plates i.e.
  • they are connected on the positive side […]
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Experiment making ethanol

By |2025-02-12T09:08:16+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: making ethanol

Aim: To make ethanol by fermenting glucose

Materials: conical flask/plastic bottle, cork, glass/rubber tube,lime water, 5% glucose solution, yeast, mealie meal

Method

  1. Add about 50cm3 of the 5% glucose solution into the flask
  2. Add a spatula of yeast/mix mealie meal with water […]
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Lightning and safety

By |2025-02-12T09:21:25+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Lightning conductors in action. Image credit ask.com Lightning conductors in action. Image credit ask.com ZIMSEC O Level Combined Science Notes: Lightning and safety

  • Lightning has very high voltages
  • It can electrocute, maim or kill a person if they are struck
  • Several precautions can be taken to prevent this from happening:
  • People […]
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Experiment: Connecting solar cells to make panel

By |2025-02-12T09:38:31+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Panels are made from linked solar cells. Image credit thinksolar-us.com Panels are made from linked solar cells. Image credit thinksolar-us.com ZIMSEC O Level Combined Science Notes: Experiment: Connecting solar cells to make panel

Aim:  Connecting solar cells to make a solar panel

Materials: 3 or more solar cells, connecting leads, a voltmeter and an […]

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