science notes Archives - Page 13 of 32 - Free ZIMSEC & Cambridge Revision Notes

Amylase enzyme experiment

By garikaib|2025-02-12T09:21:08+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Image credit schule-bw.de ZIMSEC O Level Combined Science Notes: Amylase enzyme experiment

Experiment

Materilas: 1% amylase enzyme/saliva, 2% startch solution, visking tubing, reagents to test for starch and sugar, beakers.

Method A: Visking Tubing.

NB. The Visking Tubing is used to function/work as a small small intestine.
Prepare two model intestines by […]

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Experiment: Testing for osmosis in living plants

By garikaib|2025-02-12T09:37:52+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Peeled potatoes. Image credit alsalamgroup.com ZIMSEC O Level Science Notes: Experiment: Testing osmosis in living plant tissue

Materials: potatoes, knife or blade, distilled water, sugar or salt, three containers,weighing balance.

Method

osmosis_plants

Prepare three pieces of peeled potato. Each block must be […]

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Reproduction in Plants:Development after fertilization

By garikaib|2025-02-12T09:29:14+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A flower fertilisation. Image credit studyblue.com Fertilisation of a flower. Image credit studyblue.com ZIMSEC O Level Combined Science Notes: Reproduction in plants: Reproduction in Plants:Development after fertilization

Once the ovules inside the ovary have been fertilized a lot of changes takes place
The fertilized ovules develop into seeds inside the ovary
The ovary […]

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Experiment: Testing the alkalinity/acidity of the soil

By garikaib|2025-02-12T09:45:43+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Testing the PH of soil. Image credit blogspot.com ZIMSEC O Level Combined Science Notes: Testing the alkalinity/acidity of the soil

Materials: Universal indicator/PH paper/PH Test meter, distilled water, test tubes, soil samples

Method

Place the soil samples into test tubes to a height of about […]

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The states of matter

By garikaib|2025-02-12T09:08:28+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

States of matter. Image credit britannica.com ZIMSEC O Level Combined Science Notes: The states of matter

Matter exists in three forms:

gas
liquid
solid

NB There is a fourth state of matter: plasma but it is beyond the scope of the ordinary level syllabus
Indeed there are other states but […]

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Science:Malnutrition

By garikaib|2025-02-12T09:15:17+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Eating junk food can lead to obesity. Image credit newtimes.co.rw ZIMSEC O Level Combined Science Notes: Malnutrition

Malnutrition is lack of proper nutrition
It is a result of either not having enough to eat
Or not eating enough of certain nutrients that the […]

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The oxidation process
Gallery
The oxidation process

Notes, O Level Science Notes, Ordinary Level Notes

The oxidation process

By garikaib|2025-02-12T09:42:38+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: The oxidation process

Oxygen can be added to a substance/compound/element
For example carbon may be burnt into the air to form carbon dioxide
This process is known as oxidation
Oxidation is the process by which a substance/compound/element combines with oxygen in a chemical reaction
Oxidation is also used to refer to a […]

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Experiment: Making salt:copper sulphate
Gallery
Experiment: Making salt:copper sulphate

Notes, O Level Science Notes, Ordinary Level Notes

Experiment: Making salt:copper sulphate

By garikaib|2025-02-12T09:11:09+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Experiment: Making salt:copper sulphate

Materials: Making a salt, copper sulphate

Materials: copper oxide, dilute sulphuric acid, plastic beaker, evaporating dish, filter funnel, filter paper, stirring rod, spatula/plastic teaspoon

Making copper sulphate

Method

Pour 20cm³ dilute sulphuric acid into a beaker
Add a small spatula load of copper oxide and […]

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Experiment: The flotation cell

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

The purification of copper using the flotation cell ZIMSEC O Level Combined Science Notes:Experiment: The flotation cell

Aim: To make a copper flotation cell

Materials: basin of water, mixture of sand and powdered copper sulphide, washing powder/dish washing liquid,litmus paper, rubber tube, filter funnel, tray, wooden […]

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