February 2025

Experiment: Growing plants using the vegetative reproduction method

By |2025-02-12T09:37:05+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Growing mulberry cuttings. Image credit wordpress.com Growing mulberry cuttings. Image credit wordpress.com ZIMSEC O Level Combined Science Notes: Reproduction in plants: Growing plants using the vegetative reproduction method  

Materials; trays of soil/sand or prepared garden beds, plant cuttings of sugar cane, mulberry, sweet potato cuttings etc

Method Plant [...] </p srcset=

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Breeding

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

SeedCo trial fields are used for breeding seeds. Image credit seedco.co SeedCo trial fields are used for breeding seeds. Image credit seedco.co ZIMSEC O Level Combined Science Notes: Breeding

  • Controlled breeding in livestock and crops allow farmers to obtain animals and crops with the best characteristics
  • Each breed or variety has is […]
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Experiment: The heating curve of water

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

The heating curve of water. Image credit wordpress.com The heating curve of water. Image credit wordpress.com ZIMSEC O Level Combined Science Notes: Experiment: The heating curve of water

Materials: beaker, crushed ice, thermoter, burner, clock/watch with a stop watch function

Method

  1. Half fill a beaker with crushed ice
  2. Record the temperature of the ice
  3. Place […]
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The format of a Balance Sheet/Statement of Financial Position

By |2025-02-12T09:31:56+02:00February 12th, 2025|Notes, Ordinary Level Notes, Principles of Accounts Notes|

ZIMSEC O Level Principles of Accounts Notes: The format of a Balance Sheet/Statement of Financial Position

The Name of the Business(The Name of the Sole Trader is used in Sole Trader Businesses)

Statement of Financial Position as at 31 December 2016

  • The name of the business is to be replaced by the name of the sole […]
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Discount Allowed and Discount Received entries

By |2025-02-12T09:06:02+02:00February 12th, 2025|Notes, Ordinary Level Notes, Principles of Accounts Notes|

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

  • Consider the following entries and enter them into the books of J Haudzwi

July 20×9
1 Started the business with $1000 Cash
3 Deposited $600 from the […]

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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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The reduction process

By |2025-02-12T09:43:27+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes:  The reduction process

  • Reduction is the opposite of oxidation
  • Reduction is the removal of oxygen from a substance/compound
  • It can also be the addition of oxygen

The reduction of copper. Image credit chemistrydemos.co.uk The reduction of copper.

  • A reducing agent removes oxygen or adds hydrogen
  • Metals cannot be […]
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Experiment: Making salt:copper sulphate

By |2025-02-12T09:11:09+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Experiment: Making salt:copper sulphate

Materials: Making a salt, copper sulphate

Materials: copper oxide, dilute sulphuric acid, plastic beaker, evaporating dish, filter funnel, filter paper, stirring rod, spatula/plastic teaspoon

Making copper sulphate Making copper sulphate

Method

  1. Pour 20cm3 dilute sulphuric acid into a beaker
  2. Add a small spatula load of copper oxide and […]
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Experiment: The flotation cell

By |2025-02-12T09:28:07+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

The purification of copper using the flotation cell The purification of copper using the flotation cell ZIMSEC O Level Combined Science Notes:Experiment: The flotation cell

Aim:  To make a copper flotation cell

Materials: basin of water, mixture of sand and powdered copper sulphide, washing powder/dish washing liquid,litmus paper, rubber tube, filter funnel, tray, wooden […]

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Experiment: Electrolysis of water

By |2025-02-12T09:41:56+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Apparatus used in the electrolysis of water. Image credit youtube.com Apparatus used in the electrolysis of water. Image credit youtube.com ZIMSEC O Level Combined Science Notes: Experiment: Electrolysis of water

Aim: To produce hydrogen gas using the electrolysis of water

Materials: beaker, test tubes, carbon electrodes, water, concentrated sulphuric acid, battery/8-12v power supply, connecting […]

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