Ordinary Level Notes Archives - Page 79 of 180 - Free ZIMSEC & Cambridge Revision Notes

Experiment: to show changes in shape and volume of iodine crystals when they are heated

By garikaib|2025-02-12T09:11:39+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

sublimation_of_iodine-min

ZIMSEC O Level Combined Science Notes: An experiment To show changes in shape and volume of iodine crystals when they are heated

Materials: evaporation dish/tin lid, glass filter funnel, burner, burner stand, one iodine crystal

Method

Place the iodine crystal into an evaporation dish
Put the filter funnel upside down over the crystal
Warm the crystals […]

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Sole Trader: Balance Sheet

By garikaib|2025-02-12T09:31:07+02:00February 12th, 2025|Notes, Ordinary Level Notes, Principles of Accounts Notes|

Image credit ksu.edu.tr ZIMSEC O Level Principles of Accounts Notes: Introduction to Balance Sheets

It is also known as the Statement of Financial Position
It is a statement of the assets, liabilities, and capital of a business at a particular point in time
It is a financial snap shot of […]

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Cash Discount,Discount Received and Discount Allowed

By garikaib|2025-02-12T09:05:08+02:00February 12th, 2025|Notes, Ordinary Level Notes, Principles of Accounts Notes|

Cash Discount. Image credit wiser.com ZIMSEC O Level Principles of Accounts Notes: The Cash Book:Discount Received and Discount Allowed

Businesses prefer it if their customers pay quickly
Businesses may thus accept a sum slightly lower than the invoice amount in settlement of a debt if payment is […]

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Experiment: Testing the physical properties of metals and non-metals

By garikaib|2025-02-12T09:23:02+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Common non-metals. Image credit blogspot.com ZIMSEC O Level Combined Science Notes: Experiment: Testing the physical properties of metals and non-metals

Aim:To examine the physical properties of metals and non-metals

Materials: aluminium foil, carbon rod taken from a torch cell, copper foil, gas jars of oxygen, hydrogen; sulpher, […]

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The reduction process
Gallery
The reduction process

Notes, O Level Science Notes, Ordinary Level Notes

The reduction process

By garikaib|2025-02-12T09:43:27+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: The reduction process

Reduction is the opposite of oxidation
Reduction is the removal of oxygen from a substance/compound
It can also be the addition of oxygen

The reduction of copper. Image credit chemistrydemos.co.uk The reduction of copper.

A reducing agent removes oxygen or adds hydrogen
Metals cannot be […]

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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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Experiment: Electrolysis of water

By garikaib|2025-02-12T09:41:56+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Apparatus used in the electrolysis of water. Image credit youtube.com ZIMSEC O Level Combined Science Notes: Experiment: Electrolysis of water

Aim: To produce hydrogen gas using the electrolysis of water

Materials: beaker, test tubes, carbon electrodes, water, concentrated sulphuric acid, battery/8-12v power supply, connecting […]

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Experiment: Distillation of alcohol

By garikaib|2025-02-12T09:08:51+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Distillation of alcohol. Image credit bbc.co,uk ZIMSEC O Level Combined Science Notes: Experiment: The distillation of ethanol

Aim: To concentrate alcohol using the distillation process

Materials: thermometer, clamp stands, rubber bungs, round bottomed flask, fractionating column. condenser with rubber tubing, watch-glass or tin lid, porcelain chips or clean dry sand

[…]

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Current electricity

By garikaib|2025-02-12T09:22:50+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A simple circuit diagram ZIMSEC O Level Combined Science Notes: Current electricity

When electricity flows from one point to another through a conductor this is known as electric current
Electric current when electricity flows from one point to another through a conductor
If an electric cell is used

[…]

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February 2025