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Introduction to acids
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Introduction to acids

Notes, O Level Science Notes, Ordinary Level Notes

Introduction to acids

By garikaib|2025-02-12T08:59:45+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Introduction to acids

A lot of everyday materials are acidic
This means that they contain an acid
Examples of everyday materials that contain acids are:
Lemons and other citric fruits as well as materials that contain these for example Orange crush
Vinegar (contains ethanoic/acetic acid)
Battery acid (sulphuric acid)
Other acids include: […]

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Reversible reactions
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Reversible reactions

Notes, O Level Science Notes, Ordinary Level Notes

Reversible reactions

By garikaib|2025-02-12T09:17:50+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Reversible reactions

In a reversible reaction there is a forward reaction
And a backward reaction
Both take place at the same time
As a result there is an equilibrium between the reagents and their products
That is at some point during the reaction process the amounts of both the reagents and their […]

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The electroplating process

By garikaib|2025-02-12T09:32:31+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Chome plated metal. Image credit MediaWiki ZIMSEC O Level Combined Science Notes: The electroplating process

Metals can be protected from corrosion by plating (covering) them with a less reactive metal
The metal which does not react with oxygen protects the more reactive metal underneath it

[…]

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The manufacture of fertilizers
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The manufacture of fertilizers

Notes, O Level Science Notes, Ordinary Level Notes

The manufacture of fertilizers

By garikaib|2025-02-12T08:59:33+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: The manufacture of fertilisers

Some of the nitric acid produced at Sable Chemicals is used to make ammonium nitrate fertilizer
It is used as an input (feedstock) for the fertilizer plant at both Sable and Zimphos
To maintain soil fertility nitrogen containing compounds are added to the soil
Some of these fertilizers are […]

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The carburetor

By garikaib|2025-02-12T09:14:26+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A carburettor is an important part of the Petrol engine. Image credit MediaWiki ZIMSEC O Level Combined Science Notes: The carburetor

A carburettor is an essential part of Petrol engines
A typical carburettor has the following parts:
An […]

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Electrical Power
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Electrical Power

Notes, O Level Science Notes, Ordinary Level Notes

Electrical Power

By garikaib|2025-02-12T09:30:22+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Electrical Power

Electric power is the rate of doing work or the rate of of using energy
Electric power is the rate which an electrical device is converting electrical energy into heat or light or any other form of energy e.g kinetic energy in an electric motor
When current flows through a wire some of […]

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Experiment: Demonstrating how current is induced

By garikaib|2025-02-12T09:45:24+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Inducing a current using a magnet. Image credit youtube.com ZIMSEC O Level Combined Science Notes: Experiment: Demonstrating how current is induced

Aim: To demonstrate electromagnetic induction

Materials: an electric coil (you can make one using varnished copper), galvanometer with a zero at the centre, connecting leads […]

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Comparing the strength of cylindrical and square tube beams

By garikaib|2025-02-12T09:09:42+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Testing the strength of a beam ZIMSEC O Level Combined Science Notes: Experiment: Comparing the strength of cylindrical and square tube beams

Aim: To compare the strength of cylindrical and square tubes

Materials: thin cardboard, tin can, sand and glue.

Method

Make a cylindrical tube by rolling a piece […]

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Experiment: To compare the shear and tensile strength of sponge rubber and soft wood

By garikaib|2025-02-12T09:26:19+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Sheets of made of sponge rubber. Image credit rollsheetrubber.com ZIMSEC O Level Combined Science Notes: Experiment: To compare the shear and tensile strength of sponge rubber and soft wood