Ordinary Level Notes Archives - Page 70 of 180 - Free ZIMSEC & Cambridge Revision Notes

The relationship between volume and state

By garikaib|2025-02-12T09:09:59+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

The three states of matter and volume. Image credit ucdavis.edu ZIMSEC O Level Combined Science Notes: The relationship between volume and state

Solids

due to the fact that the particles in a solid are in fixed positions
solids have a fixed […]

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Simple Trading and Profit and Loss Account Example 2

By garikaib|2025-02-12T09:27:18+02:00February 12th, 2025|Notes, Ordinary Level Notes, Principles of Accounts Notes|

Image credit bhofinance.com ZIMSEC O Level Principles of Accounts Notes: Simple Trading and Profit and Loss Account Example 2

From the following trial balance of J Nhiwatiwa after his first year’s trading, you are required to
draw up a trading and profit and loss account for the year ended […]

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The whites involved in the signing of treaties and concessions in Zimbabwe between 1850 and 1891

By garikaib|2025-02-12T08:59:20+02:00February 12th, 2025|Notes, O Level History Notes, Ordinary Level Notes|

Piet Grobbler was one of the whites that signed a treaty with Lobengula. image credit boostdam.net ZIMSEC O Level History Notes:The Colonisation of Zimbabwe:The whites involved in the signing of treaties and concessions in Zimbabwe […]

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Chemical Reactions
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Chemical Reactions

Notes, O Level Science Notes, Ordinary Level Notes

Chemical Reactions

By garikaib|2025-02-12T09:19:25+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Chemical Reactions

Introduction to reactions

A compound is formed when a chemical reaction takes place
Chemical change takes place to form the compound
Word equations can be used as a short hand way to show what has happened
An example of a chemical equation is:
\text{iron + sulpher}\rightarrow \text{iron sulphide}
As already […]

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The reaction of metals with dilute acids
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The reaction of metals with dilute acids

Notes, O Level Science Notes, Ordinary Level Notes

The reaction of metals with dilute acids

By garikaib|2025-02-12T09:38:29+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Experiment: The reaction of metals with dilute acids

Metals also react with dilute acids such as
Dilute hydrochloric acid
Hydrogen gas is released as a by product of the reaction
Metals such as calcium, magnesium and zinc that react with water react even more vigorously with dilute acids
Metals that react with […]

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The pH scale

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

Universal indicator results showing the pH of various solutions. Image credit MediaWiki ZIMSEC O Level Combined Science Notes: The pH scale

The pH colour chart. Image credit abcam.com The pH colour chart. Image […]

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Steel making

By garikaib|2025-02-12T09:24:04+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Steel beams. Image credit risleysteelservices.ca ZIMSEC O Level Combined Science Notes: Steel making

The iron from the oxygen lance process is poured into a ladle and
Small amounts of other metals are mixed with it
It is mixed with metals such as:
manganese, cobalt, chromium […]

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Summary of plating and its uses

By garikaib|2025-02-12T09:37:34+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Tin plating is used in making food cans. Image credit alsagerfoodbank.org.uk ZIMSEC O Level Combined Science Notes: Summary of plating and its uses

The electroplating processes can be summarized as below

The various plating processes and their uses […]

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Experiment:Making coke and collecting the resulting gases

By garikaib|2025-02-12T09:05:22+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Making coke ZIMSEC O Level Combined Science Notes: Experiment:Making coke and collecting the resulting gases

Aim: To make coke using coal and collect the gas and liquid by-products

Materials: crushed coal, test tubes, glass tubing, splints, lead ethanoate solution, filter paper, red and blue litmus paper, sodium hydroxide solution, beaker, water, trough, […]

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