Ordinary Level Notes Archives - Page 4 of 180 - Free ZIMSEC & Cambridge Revision Notes

Structure of atoms: protons,electrons and neutrons

By garikaib|2025-02-12T09:05:35+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

The atomic structure of carbon. Image credit ucsb.edu ZIMSEC O Level Combined Science Notes: Structure of atoms: protons,electrons and neutrons

Protons and neutrons

The protons are the positive charge in the nucleus of an atom
The neutrons are also in the nucleus but they have […]

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Terms used in the Trading and Profit and Loss account

By garikaib|2025-02-12T09:17:42+02:00February 12th, 2025|Notes, Ordinary Level Notes, Principles of Accounts Notes|

Image credit clarkewillmot.com ZIMSEC O Level Principles of Accounts Notes: Terms used in the Trading and Profit and Loss account

Gross profit

is the excess of sales over the cost of goods sold
If the amount of cost of goods sold is more than the amount of sales the result […]

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G Musandu Solution:Trading and Profit and Loss Account

By garikaib|2025-02-12T09:41:22+02:00February 12th, 2025|Notes, Ordinary Level Notes, Principles of Accounts Notes|

Trading and Profit and Loss Account for G Muasandu. Image credit fidato.ca ZIMSEC O Level Principles of Accounts Notes: Sole Trader: Trading and profit and loss accounts and balance sheets: Other items

This is a solution to the question […]

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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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