science notes Archives - Page 5 of 32 - Free ZIMSEC & Cambridge Revision Notes

Growth and Development in Animals

By garikaib|2022-09-15T12:41:49+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

A day old chick. Image credit 21food.com ZIMSEC O Level Combined Science Notes: Growth and Development in Animals.

Animals use some of the energy from the food they eat to grow.
During the growth process an animal changes and matures into an adult.
This process is […]

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The movement of molecules in plants: Diffusion

By garikaib|2022-09-15T12:40:51+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Coloured ink droplets falling and diffusing in a glass of water. Image credit pinterest.com ZIMSEC O Level Combined Science Notes:The movement of molecules

Both plants and animals contain a large amount of water in their tissue.
Plants like […]

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Examining adaptations of flowers to pollination

By garikaib|2022-09-15T12:40:35+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

A bird pollinating a flower. Image credit gilligalloubird.com ZIMSEC O Level Combined Science Notes: Reproduction in plants: Examining adaptations of flowers to pollination

Materials: maize(male and female) or any type of grass flowers, bean flowers or any insect pollinated flowers, hand lenses, microscope slides, […]

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Experiment: Comparing leaching in soils

By garikaib|2022-09-15T12:40:27+02:00January 24th, 2023|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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Isotopes and the importance of proton numbers

By garikaib|2022-09-15T12:40:17+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

The three isotopes of hydrogen. Image credit MediaWiki ZIMSEC O Level Combined Science Notes: Isotopes and the importance of proton numbers

The electron orbits of these two elements is small and can only carry two electrons
The next element in the series is lithium
It comes […]

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The relationship between a beam’s strength and depth

By garikaib|2022-09-15T12:39:50+02:00January 24th, 2023|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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Predicting reactions of a metal using the reactivity series

By garikaib|2022-09-15T12:39:37+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

The reactivity series. Image credit wordpress.com ZIMSEC O Level Combined Science Notes: Experiment: Predicting reactions of a metal using the reactivity series

Metals do not react with water and air at the same rate
The rate at which they react differs from metal to metal
Some metals […]

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Experiment: Making acidic and alkaline solutions

By garikaib|2022-09-15T12:39:29+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Burning sulpher ZIMSEC O Level Combined Science Notes: Experiment: Making acidic and alkaline solutions

Aim: To make acidic and alkaline solutions

Materials: sodium oxide, magnesium oxide, aluminium oxide, zinc oxide, unversal indicator, deflagrating spoon, sulpher, powdered carbon

Method

Dissolve a very small amount of sodium oxide in half a test tube of water
Add 2 drops […]

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Extraction of copper from sulphides
Gallery
Extraction of copper from sulphides

Notes, O Level Science Notes, Ordinary Level Notes

Extraction of copper from sulphides

By garikaib|2022-09-15T12:39:20+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes:Extraction of copper from sulphides

Copper is extracted from various types of ore including sulphide ores
For example copper ores found on the Great Dyke near Mhangura is of the sulphide type
Once the sulphide ore is extracted from the earth
It is crushed to form a very fine powder which is then further […]

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