Ordinary Level Notes Archives - Page 5 of 180 - Free ZIMSEC & Cambridge Revision Notes

The relationship between a beam’s strength and depth

By garikaib|2025-02-12T09:14:03+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

The greater the depth of a beam the more load it can support ZIMSEC O Level Combined Science Notes: The relationship between a beam’s strength and depth

A beam is stronger if it’s depth if it has greater depth
For […]

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Factors to consider when offering capital

By garikaib|2025-02-12T09:30:41+02:00February 12th, 2025|Notes, O Level Business Studies Notes, Ordinary Level Notes|

Lenders of capital have a lot of factors to consider. Image credit earlyretirement.com ZIMSEC O Level Business Studies Notes: Factors to consider when offering capital

Financial institutions such as banks and micro lenders consider a lot of factors […]

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Differences between reduction and oxidation
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Differences between reduction and oxidation

Notes, O Level Science Notes, Ordinary Level Notes

Differences between reduction and oxidation

By garikaib|2025-02-12T08:57:47+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Differences between reduction and oxidation

There are differences between oxidation and reduction
The table below shows the differences between oxidation and reduction:

Often reduction and oxidation occur in conjunction
That is at the same time and during the same reaction
For example:
\text{ammonia+oxygen}\rightarrow\text{water+nitrogen dioxide}
Nitrogen gains oxygen and losses hydrogen […]

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Experiment: The effects of a catalyst on the rate of a reaction

By garikaib|2025-02-12T09:17:07+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Copper (II) can be used as a catalyst. Image credit chemistry-reference.com ZIMSEC O Level Combined Science Notes: Experiment: The effects of a catalyst on the rate of a reaction

Aim: To investigate the effects of a catalyst on a reaction using […]

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Galvinasing iron

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

Corrugated iron sheets are galvanised. Image credit alibaba.com ZIMSEC O Level Combined Science Notes: Galvinasing iron

Galvanising is one of the methods used to prevent iron from rusting
Iron and steel can be coated with zinc
Zinc is a fairly more reactive metal

[…]

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The production of Nitric acid
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The production of Nitric acid

Notes, O Level Science Notes, Ordinary Level Notes

The production of Nitric acid

By garikaib|2025-02-12T08:58:32+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: The production of Nitric acid

Some of the ammonia produced using the Haber process is used in the production of nitric acid
The first stage in the process of making nitric acid is the oxidation of ammonia
To form nitric acid
\text{ammonia + oxygen} \rightarrow\text{nitric oxide+ water+heat}
This an exothermic reaction

[…]

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The Petrol engine

By garikaib|2025-02-12T09:13:38+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Four Stroke Petrol Engine. Image credit petrolheadkenya.com ZIMSEC O Level Combined Science Notes: The Petrol engine

Four strokes are involved in the operation of most petrol engines
They are thus known as four-stroke engines
The first stroke is known as the inlet stroke
During the […]

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Experiment: Determining the resistance of resistors in parallel and in series

By garikaib|2025-02-12T09:29:49+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Resistors in series ZIMSEC O Level Combined Science Notes: Experiment: Determining the resistance of resistors in parallel and in series

Aim: To determine the combined resistance of resistors in series and in parallel

Materials: 4 cells, 2 bulbs/2 resistors, switch, ammeter, voltmeter, leads with crocodile clips

Method Resistors in [...]
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Experiment: Generating electricity

By garikaib|2025-02-12T09:44:30+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A dynamo. Image credit wikihow.com ZIMSEC O Level Combined Science Notes: Experiment: Generating electricity

Aim: To generate electric current

Materials: dynamo, lamp bulb, copper wires, crank or a set of pulleys and weights to turn dynamo, rubber band

Method

Set up the apparatus with the dynamo on a table, the rubber […]

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Testing the strength of various beams

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

Testing the strength of beams ZIMSEC O Level Combined Science Notes: Experiment: Testing the strength of various beams

Aim: To make different shaped beams and test their strength

Materials: thin pieces of poplar wood, sharp knife, weights, 2 clamps, 2 bricks

Cut beams about 20cm long with different cross-sectional […]

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February 2025