Notes Archives - Page 63 of 189 - Free ZIMSEC & Cambridge Revision Notes

Health and well being

By garikaib|2025-02-12T09:10:54+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Exercise is key to maintaining one’es health. Image credit centrictv.com ZIMSEC O Level Combined Science Notes: Health and well being

Health is the absence of disease
It is a state of being physically and psychologically well.
A person is said to be healthy […]

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The differences between wind and insect pollinated flowers

By garikaib|2025-02-12T09:26:15+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Maize flower close up. image credit freeimagescollection.com ZIMSEC O Level Combined Science Notes: Reproduction in plants: The differences between wind and insect pollinated flowers

Not all flowers are exactly the same
Some flowers have adapted to be pollinated by wind
Others have adapted in a way […]

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Experiment: Comparing leaching in soils

By garikaib|2025-02-12T09:43:26+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Leach the soil ZIMSEC O Level Combined Science Notes: Comparing leaching in soils

Materials: soil samples, distilled water, burners, 3 beakers, measuring cylinders, cotton wool, filter funnel

Method Boil the filtrate

Set up the samples as shown in the diagram […]

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Elements and the proton number

By garikaib|2025-02-12T09:06:13+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Elements arranged according to their proton number. Image credit wallpapercave.com ZIMSEC O Level Combined Science Notes: Elements and the proton number

The atoms of different elements are different from each other
This is because they have different numbers of protons and neutrons
Each […]

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Sole Trader: Trading and Profit and Loss Account and Capital Accounts

By garikaib|2025-02-12T09:18:14+02:00February 12th, 2025|Notes, Ordinary Level Notes, Principles of Accounts Notes|

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

The Trading and Profit and Loss Account is not balanced off at the end of the trading period
This means there are in no corresponding “balance b/d” in the […]

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G Musandu: Solution: Balance Sheet

By garikaib|2025-02-12T09:42:57+02:00February 12th, 2025|Notes, Ordinary Level Notes, Principles of Accounts Notes|

Balance Sheet for G Musandu. Image credit ojac.org ZIMSEC O Level Principles of Accounts Notes: Sole Trader: Trading and profit and loss accounts and balance sheets: Other items

This is the Balance Sheet Solution for the Trial Balance Question found here.

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The strength of Materials

By garikaib|2025-02-12T09:14:47+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Different materials have different strength. Image credit wisegeek.com ZIMSEC O Level Combined Science Notes: The strength of Materials

A beam should be made of stronger material so that it can support a greater load
Different materials have different strength
Some material is greater when put […]

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Heating metals in air
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Heating metals in air

Notes, O Level Science Notes, Ordinary Level Notes

Heating metals in air

By garikaib|2025-02-12T09:32:08+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Heating metals in air

Some metals react with oxygen in the air at ordinary (room) temperature
Others only react with oxygen if they are heated in air
They may do this readily and release large amounts of energy in the process
Some metals hardily react at all even at very high temperatures

[…]

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Introduction to acids
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Introduction to acids

Notes, O Level Science Notes, Ordinary Level Notes

Introduction to acids

By garikaib|2025-02-12T08:59:45+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Introduction to acids

A lot of everyday materials are acidic
This means that they contain an acid
Examples of everyday materials that contain acids are:
Lemons and other citric fruits as well as materials that contain these for example Orange crush
Vinegar (contains ethanoic/acetic acid)
Battery acid (sulphuric acid)
Other acids include: […]

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Reversible reactions
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Reversible reactions

Notes, O Level Science Notes, Ordinary Level Notes

Reversible reactions

By garikaib|2025-02-12T09:17:50+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Reversible reactions

In a reversible reaction there is a forward reaction
And a backward reaction
Both take place at the same time
As a result there is an equilibrium between the reagents and their products
That is at some point during the reaction process the amounts of both the reagents and their […]

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February 2025