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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Investigating water loss in plants

By |2022-09-15T12:40:39+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Transpiration occurs mainly through the leaves. Image credit desk7.net

Transpiration occurs mainly through the leaves. Image credit desk7.net ZIMSEC O Level Combined Science Notes: Investigating water loss in plants

Aim: To determine how plants loose their water

Materials: plants or branches from plants, weighing balance, containers, water, oil/Vaseline.


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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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The Carbon cycle

By |2022-09-15T12:40:21+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

The carbon cycle. Image credit windows2universe.org

The carbon cycle. Image credit windows2universe.org ZIMSEC O Level Combined Science Notes: The Carbon cycle
  • Carbon dioxide in the atmosphere is the source of carbon in ecosystems
  • Plants remove carbon dioxide from the air during photosynthesis and use it to build food compounds
  • Animals obtain the carbon […]

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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: The properties of acids

By |2022-09-15T12:39:31+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Universal paper can be used to test the acidity of a solution. Image credit MediaWiki

Universal paper can be used to test the acidity of a solution. Image credit MediaWiki ZIMSEC O Level Combined Science Notes: Experiment: The properties of acids

Aim:  Investigating the properties of acids

Materials: Dilute hydrochloric acid, vinegar, lemon juice, […]


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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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