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The strength of Materials

By garikaib|2025-02-12T09:14:47+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Different materials have different strength. Image credit wisegeek.com ZIMSEC O Level Combined Science Notes: The strength of Materials

A beam should be made of stronger material so that it can support a greater load
Different materials have different strength
Some material is greater when put […]

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Heating metals in air
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Heating metals in air

Notes, O Level Science Notes, Ordinary Level Notes

Heating metals in air

By garikaib|2025-02-12T09:32:08+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Heating metals in air

Some metals react with oxygen in the air at ordinary (room) temperature
Others only react with oxygen if they are heated in air
They may do this readily and release large amounts of energy in the process
Some metals hardily react at all even at very high temperatures

[…]

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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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