O Level Science Notes Archives - Page 26 of 33 - Free ZIMSEC & Cambridge Revision Notes

Natural Ecosystems

By garikaib|2022-09-15T12:40:22+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Impala ecosystem Natural ecosystem. Image credit wordpress.com ZIMSEC O Level Combined Science Notes: Natural Ecosystems

In a natural ecosystem there is close interaction between the plants and animals
The green plants are the producers
The animals are the consumers
There are several levels of consumers
Primary consumers-these eat plants directly
They are also known as herbivores
Secondary […]

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Experiment: to show the cooling effect of vaporizing ether

By garikaib|2022-09-15T12:40:12+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Vapourising ether. ZIMSEC O Level Combined Science Notes: Experiment: to show the cooling effect of vaporizing ether

Materials: ether, glass tube, small wooden block, glass beaker

Method

Place a small beaker over a few drops of […]

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Experiment: Testing the physical properties of metals and non-metals

By garikaib|2022-09-15T12:39:44+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Common non-metals. Image credit blogspot.com ZIMSEC O Level Combined Science Notes: Experiment: Testing the physical properties of metals and non-metals

Aim:To examine the physical properties of metals and non-metals

Materials: aluminium foil, carbon rod taken from a torch cell, copper foil, gas jars of oxygen, hydrogen; sulpher, […]

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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|2022-09-15T12:39:32+02:00January 24th, 2023|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|2022-09-15T12:39:24+02:00January 24th, 2023|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|2022-09-15T12:39:14+02:00January 24th, 2023|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|2022-09-15T12:39:01+02:00January 24th, 2023|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|2022-09-15T12:38:53+02:00January 24th, 2023|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|2022-09-15T12:38:43+02:00January 24th, 2023|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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