Notes Archives - Page 29 of 189 - Free ZIMSEC & Cambridge Revision Notes

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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Transmission of electricity

By garikaib|2025-02-12T08:59:46+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

The Power Grid. Image credit source.co.zw ZIMSEC O Level Combined Science Notes: Transmission of electricity

At Hwange, Kariba, Munyati and other places AC power is generated
This is because the most efficient power generators produce AC power
In addition to that AC power can be […]

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Uses of Trusses

By garikaib|2025-02-12T09:14:28+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A girder bridge made of trusses. Image credit luetke-modellbahn.de ZIMSEC O Level Combined Science Notes: Uses of Trusses

Trusses are used extensively in large civil structures
One their uses is to make girder bridges
These bridges are designed in such a way […]

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Introduction to bridges

By garikaib|2025-02-12T09:29:06+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A simple bridge. Image credit pinimg.com ZIMSEC O Level Combined Science Notes: Introduction to bridges

A bridge is a structure that allows a road, path or railway line to cross a river/depression/gully/gap
The simplest bridge can be made using a beam lying across the gap

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