O Level Science Notes Archives - Page 24 of 33 - Free ZIMSEC & Cambridge Revision Notes

Biological components of the soil

By garikaib|2025-02-12T08:55:49+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Worms are part of the soil's biological components. Image credit wageingenur.nl Worms are part of the soil’s biological components. Image credit wageingenur.nl ZIMSEC O Level Combined Science Notes: Biological components of the soil

In addition to physical components the soil also has biological components as well
These include living plants, animals and […]

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The states of matter

By garikaib|2025-02-12T09:08:28+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

States of matter. Image credit britannica.com ZIMSEC O Level Combined Science Notes: The states of matter

Matter exists in three forms:

gas
liquid
solid

NB There is a fourth state of matter: plasma but it is beyond the scope of the ordinary level syllabus
Indeed there are other states but […]

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Science:Malnutrition

By garikaib|2025-02-12T09:15:17+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Eating junk food can lead to obesity. Image credit newtimes.co.rw ZIMSEC O Level Combined Science Notes: Malnutrition

Malnutrition is lack of proper nutrition
It is a result of either not having enough to eat
Or not eating enough of certain nutrients that the […]

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The oxidation process
Gallery
The oxidation process

Notes, O Level Science Notes, Ordinary Level Notes

The oxidation process

By garikaib|2025-02-12T09:42:38+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: The oxidation process

Oxygen can be added to a substance/compound/element
For example carbon may be burnt into the air to form carbon dioxide
This process is known as oxidation
Oxidation is the process by which a substance/compound/element combines with oxygen in a chemical reaction
Oxidation is also used to refer to a […]

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Experiment: Making salt:copper sulphate
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Experiment: Making salt:copper sulphate

Notes, O Level Science Notes, Ordinary Level Notes

Experiment: Making salt:copper sulphate

By garikaib|2025-02-12T09:11:09+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Experiment: Making salt:copper sulphate

Materials: Making a salt, copper sulphate

Materials: copper oxide, dilute sulphuric acid, plastic beaker, evaporating dish, filter funnel, filter paper, stirring rod, spatula/plastic teaspoon

Making copper sulphate

Method

Pour 20cm³ dilute sulphuric acid into a beaker
Add a small spatula load of copper oxide and […]

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Experiment: The flotation cell

By garikaib|2025-02-12T09:28:07+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

The purification of copper using the flotation cell ZIMSEC O Level Combined Science Notes:Experiment: The flotation cell

Aim: To make a copper flotation cell

Materials: basin of water, mixture of sand and powdered copper sulphide, washing powder/dish washing liquid,litmus paper, rubber tube, filter funnel, tray, wooden […]

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Experiment: Electrolysis of water

By garikaib|2025-02-12T09:41:56+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Apparatus used in the electrolysis of water. Image credit youtube.com ZIMSEC O Level Combined Science Notes: Experiment: Electrolysis of water

Aim: To produce hydrogen gas using the electrolysis of water

Materials: beaker, test tubes, carbon electrodes, water, concentrated sulphuric acid, battery/8-12v power supply, connecting […]

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Experiment: Distillation of alcohol

By garikaib|2025-02-12T09:08:51+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Distillation of alcohol. Image credit bbc.co,uk ZIMSEC O Level Combined Science Notes: Experiment: The distillation of ethanol

Aim: To concentrate alcohol using the distillation process

Materials: thermometer, clamp stands, rubber bungs, round bottomed flask, fractionating column. condenser with rubber tubing, watch-glass or tin lid, porcelain chips or clean dry sand

[…]

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Current electricity

By garikaib|2025-02-12T09:22:50+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A simple circuit diagram ZIMSEC O Level Combined Science Notes: Current electricity

When electricity flows from one point to another through a conductor this is known as electric current
Electric current when electricity flows from one point to another through a conductor
If an electric cell is used

[…]

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