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

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Natural Ecosystems

By |2025-02-12T09:01:20+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Impala ecosystem Natural ecosystem. Image credit wordpress.com ZIMSEC O Level Combined Science Notes: Natural Ecosystems

  • In a natural ecosystem there is close interaction between the plants and animals
  • The green plants are the producers
  • The animals are the consumers
  • There are several levels of consumers
  • Primary consumers-these eat plants directly
  • They are also known as herbivores
  • Secondary […]
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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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Differences between reduction and oxidation

By |2025-02-12T08:57:47+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Differences between reduction and oxidation

  • There are differences between oxidation and reduction
  • The table below shows the differences between oxidation and reduction:
  • Often reduction and oxidation occur in conjunction
  • That is at the same time and during the same reaction
  • For example:
  • \text{ammonia+oxygen}\rightarrow\text{water+nitrogen dioxide}
  • Nitrogen gains oxygen and losses hydrogen […]
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Reversible reactions

By |2025-02-12T09:17:50+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Reversible reactions

  • In a reversible reaction there is a forward reaction
  • And a backward reaction
  • Both take place at the same time
  • As a result there is an equilibrium between the reagents and their products
  • That is at some point during the reaction process the amounts of both the reagents and their […]
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The electroplating process

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

Chome plated metal. Image credit MediaWiki Chome plated metal. Image credit MediaWiki ZIMSEC O Level Combined Science Notes: The electroplating process

  • Metals can be protected from corrosion by plating (covering) them with a less reactive metal
  • The metal which does not react with oxygen protects the more reactive metal underneath it

    • […]

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