Ordinary Level Notes Archives - Page 59 of 180 - Free ZIMSEC & Cambridge Revision Notes

A List of the treaties signed by Lobengula and the whites in the 19th century

By garikaib|2025-02-12T08:58:31+02:00February 12th, 2025|Notes, O Level History Notes, Ordinary Level Notes|

The British Explorer Thomas Baines who signed the Baines concession. Image credit artexpertwebsite.com

The British Explorer Thomas Baines who signed the Baines concession. Image credit artexpertwebsite.comZIMSEC O Level History Notes:The Colonisation of Zimbabwe:A List of the treaties signed by Lobengula and the whites in the 19th century

The following treaties were signed by […]

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Experiment:Making a mixture and compound

By garikaib|2025-02-12T09:18:27+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

The iron and sulpher mixture glows when heated as it forms a compound ZIMSEC O Level Combined Science Notes: Experiment:Making a mixture and compound

Aim: To Make a mixture of iron and sulpher and change it into a compound using […]

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Experiment: The reaction of magnesium with steam

By garikaib|2025-02-12T09:36:37+02:00February 12th, 2025|Notes, O Level Shona Notes, Ordinary Level Notes|

Magnesium reacts with steam ZIMSEC O Level Combined Science Notes: Experiment: The reaction of metals and water

Aim: To investigate and observe the reaction of magnesium and water

Materials: magnesium ribbon, hard glass test tube, water, sand, 2 burners, short glass tube, splint, clamp stand

Method

Set up the apparatus as shown […]

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Introduction to Bases

By garikaib|2025-02-12T09:05:36+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Household goods that are bases. Image credit MediaWiki ZIMSEC O Level Combined Science Notes: Introduction to Bases

Bases are different from acids
When a base dissolves in water it makes an alkaline solution
Metal oxides are bases
They dissolve in water to form alkaline solutions
These solutions are […]

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Cast iron and the oxygen lance process

By garikaib|2025-02-12T09:23:11+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Molten cast iron. Image credit engineering.com ZIMSEC O Level Combined Science Notes: Cast iron and the oxygen lance process

The iron that is produced in the blast furnace contains about 4% carbon in mass terms
It also has other impurities such as phosphorus and sulpher

[…]

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Experiment: Investigating the corrosion of iron

By garikaib|2025-02-12T09:37:06+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Rusting iron nails. Image credit corrosionist.com ZIMSEC O Level Combined Science Notes: Experiment: Investigating the corrosion of plated of plated iron

Aim: To investigate the corrosion of iron

Materials: ferroxyl indicator (turns blue when iron rusts), iron nails, sand paper, magnesium ribbon, zinc, copper, five test tubes, paint

Method

Place […]

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The manufacture of coke at Hwange

By garikaib|2025-02-12T09:03:57+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Raw Coke. Image credit MedialWiki ZIMSEC O Level Combined Science Notes: The manufacture of coke at Hwange

Coke is a hard prous residue formed when coking coal is heated to 1250°C in the absence of air
It is almost pure carbon
It is often used as […]

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Electrostatics/Static Electricity

By garikaib|2025-02-12T09:17:45+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Demostrating static electricity using a comb. Image credit alinasadventuresinhomemaking.com ZIMSEC O Level Combined Science Notes: Electrostatics/Static Electricity

Electrostatics is the study of static electricity
Static electricity is a stationary electric charge usually generated by friction
It causes sparks or attraction between the […]

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Experiment: Changing chemical energy into electrical energy using a simple cell

By garikaib|2025-02-12T09:35:32+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A simple cell in action ZIMSEC O Level Combined Science Notes: Experiment: Changing chemical energy into electrical energy

Aim: To change chemical energy into electrical energy using a simple cell

Materials: 10 cm magnesium ribbon, strip of copper foil, dilute sulphuric acid/ethanoic acid, ammeter/lamp/torch bulb,connecting leads with crocodile clips, […]

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