January 2023

Experiment: Heating metals in air

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

Burning metals in air, Magnesium oxide. Heating metals in air, Magnesium oxide. ZIMSEC O Level Combined Science Notes: Experiment: Heating metals in air

Aim: To heat metals in air and observe and record the process and results

Materials: magnesium, zinc, iron, copper, tongs, burner

Method

  1. Exam the metals and take note of their appearance before heating […]
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Experiment: Investigating the gas produced by acids and carbonates

By |2022-09-15T12:39:30+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Experiment: Investigating the gas produced by acids and carbonates

Aim: To investigate the reaction of acids and carbonates and the gas that is produced

Materials: sodium corbonate/sodium hydrogen carbonate (baking soda), dilute hydrochloric acid/vinegar, lime water/ligted splint, 2 test tubes

Acids and carbonates react to release carbon dioxide Acids and carbonates […]

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Extraction of iron: The blast furnace

By |2022-09-15T12:39:22+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Extraction of iron: The blast furnace

  • After iron ore is mined it is send to the blast furnace
  • Iron is extracted from its ore in a blast furnace

 

The structure of a blast furnace. Image credit s-cool.co.uk The structure of a blast furnace. Image credit s-cool.co.uk

    […]
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Experiment Chrome plating a nickel cathode

By |2022-09-15T12:39:11+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Nickel and Chrome plate. Image credit 1911forum.com Nickel and Chrome plate. Image credit 1911forum.com ZIMSEC O Level Combined Science Notes: Experiment Chrome plating a nickel cathode

Aim: To chrome plate a nickel cathode

Materials: nickel-plated  electrode, lead electrode, beaker, chromic acid

Method

  1. Set up an electrolytic cell using a nickel plated cathode from this […]
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Coal as a fuel

By |2022-09-15T12:38:59+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Coal Mining at Hwange. Image credit chronicle.co.zw Coal Mining at Hwange. Image credit chronicle.co.zw ZIMSEC O Level Combined Science Notes: Coal fuel

  • Coal is a common solid fuel
  • It is a non-renewable resource
  • It is used as a raw material by industries such as at ZISCO and less commonly as a […]
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Social and economic factors to consider when using fuels

By |2022-09-15T12:38:52+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Oil spills are destructive to vegitation. Image credit africanewscircle.com Oil spills are destructive to vegetation. Image credit africanewscircle.com ZIMSEC O Level Combined Science Notes: Social and economic factors to consider when using fuels

  • The extraction and consumption of fuels has led to a lot of problems in recent years
  • Problems include:

    • […]

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Perfecting the electric cell

By |2022-09-15T12:38:42+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Polarisation in a simple cell Polarisation in a simple cell ZIMSEC O Level Combined Science Notes: Perfecting the electric cell

Voltage/Potential difference

  • The voltage between the two electrodes is dependent on the type of electrode used
  • When magnesium and copper are used the potential difference between the two electrodes is fairly high

    • […]

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Uses of generators

By |2022-09-15T12:38:34+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Generators have many uses.Image credit wheelerdealers.co.zw Generators have many uses.Image credit wheelerdealers.co.zw ZIMSEC O Level Combined Science Notes:  Uses of generators

  • In Zimbabwe there a number of Power Stations that generate electricity
  • In practice most generators are AC rather than  DC generators
  • At Kariba there is a Hydro Electric station

    • […]

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Introduction to Trusses

By |2022-09-15T12:38:26+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Roof trusses. Image credit myrooff.com Roof trusses. Image credit myrooff.com ZIMSEC O Level Combined Science Notes: Introduction to Trusses

  • A truss is a supporting framework for a roof, bridge or any other large structure
  • Box and rectangular truss frameworks are inherently weak and susceptible to shear force

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Experiment: To compare the resistance of different woods to termite attack

By |2022-09-15T12:38:19+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Treated poles. Image credit lynnridgetimbers.co.za Treated poles. Image credit lynnridgetimbers.co.za ZIMSEC O Level Combined Science Notes: Experiment: To compare the resistance of different woods to termite attack

Aim: To compare the resistance of different types of wood to termite attack

Materials: gloss paint, used motor oil, creosote, 4 samples of softwood (pine), 4 samples of […]

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