January 2023

Safety wear

By |2022-09-15T12:41:51+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Safety Equipment Image credit nextmundo.com Safety Equipment Image credit nexomundo.com ZIMSEC O Level Combined Science Notes: Safety wear

  • Pesticides are dangerous and need to be handled with care.
  • The following equipment ought to be used when handling chemicals depending on the instructions of each chemical’s label and its usage directions.

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Experiment: Do plants release carbon dioxide when they respire?

By |2022-09-15T12:41:43+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Potted plant. Image credit artificialplantsandtrees.com Potted plant. Image credit artificialplantsandtrees.com ZIMSEC Combined Science Revision Notes: Do plants release carbon dioxide when they respire?

Aim: To determine whether all living things, including plants, release carbon dioxide when they respire.

Materials: bell jar or a large container, 3 boiling tubes/flasks glass or rubber tubing, lungs, suction […]

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Ecosystems: The soil

By |2022-09-15T12:40:30+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Soil profile. Image credit nesoil.com Soil profile. Image credit nesoil.com ZIMSEC O Level Combined Science Notes: Ecosystems: The soil  

  • Soil is an important part of the ecosystem
  • It is a critical component of life on earth and agriculture
  • Soil thickness varies from a few millimeters to a several meters in places
  • Animals and plants […]
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Experiment: to show the cooling effect of methylated spirits

By |2022-09-15T12:40:12+02:00January 24th, 2023|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 |2022-09-15T12:39:44+02:00January 24th, 2023|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 |2022-09-15T12:39:23+02:00January 24th, 2023|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 |2022-09-15T12:39:13+02:00January 24th, 2023|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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