O Level Science Notes Archives - Page 8 of 33 - Free ZIMSEC & Cambridge Revision Notes

Experiment: Burning fuels

By garikaib|2025-02-12T09:02:25+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Burning Fuels ZIMSEC O Level Combined Science Notes: Experiment: Burning fuels

Aim: To burn and investigate the nature of fuels

Materials: methylated spirits/alcohol, candle, meths burner, bunsen burner, paraffin, tin lid or porcelain dish, tongs

Method

Light a meths burner and observe the flame
Burn a small amount of alcohol on a tine lid, […]

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Efficiency: Diesel vs Petrol engines

By garikaib|2025-02-12T09:15:46+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Petrol vs Diesel Engines. Image credit carblogindia.com ZIMSEC O Level Combined Science Notes: Efficiency: Diesel vs Petrol engines

Efficiency refers to the fuel economy of an engine
It measures the amount of chemical energy in the fuel that is converted to kinetic energy
The […]

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Electric cells: Introduction

By garikaib|2025-02-12T09:33:41+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Duracell electric cells. Image credit linkedin.com ZIMSEC O Level Combined Science Notes: Introduction to electric cells

An electric cell converts chemical energy into electrical energy
Two metal electrodes are dipped into an electrolyte
During the chemical reaction that takes place in the cell
One electrode […]

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The direct current generator

By garikaib|2025-02-12T08:57:49+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A DC Generator showing the basic components. Image credit blogspot.com ZIMSEC O Level Combined Science Notes: The direct current generator

In a DC generator current only flows in one direction
A DC generator has a commutator instead of slip rings
A […]

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To investigate whether the length of a beam affects its strength

By garikaib|2025-02-12T09:11:03+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Testing the length and strength of beams ZIMSEC O Level Combined Science Notes: Experiment:To investigate whether the depth of a beam affects its strength

Aim: To show how the length of a beam affects its strength

Materials: drinking straws, clamps, weights

Method

Clamp the ends of a straw […]

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Experiment To show the effect of sulphuric acid on some materials

By garikaib|2025-02-12T09:27:31+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

The effects of acid rain. Image credit penguinsofchemistry.wordpress.com ZIMSEC O Level Combined Science Notes: Experiment To show the effect of sulphuric acid on some materials

Aim: To show the effect of sulphuric acid on some materials

Materials: dilute sulphuric acid, wood, copper, plastic, iron, steel, aluminium, […]

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Dealing with friction in machines

By garikaib|2025-02-12T08:57:51+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Pouring oil into an engine. Image credit tenerifenews.com ZIMSEC O Level Combined Science Notes: Dealing with friction in machines

Friction is the force that opposes all movement
It is the resistance that one surface or object encounters when moving over another
Work must […]

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Food Preservation

By garikaib|2025-02-12T09:18:49+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Perishable foods ZIMSEC O Level Combined Science Notes: Food Preservation

A lot of the fresh food that humans eat is perishable
This is because this food is also food for bacteria, fungi and other micro-organisms
If fresh perishable food is left out in the open it will soon deteriorate […]

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