February 2025

The manufacture of fertilizers

By |2025-02-12T08:59:33+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes:  The manufacture of fertilisers

  • Some of the nitric acid produced at Sable Chemicals is used to make ammonium nitrate fertilizer
  • It is used as an input (feedstock) for the fertilizer plant at both Sable and Zimphos
  • To maintain soil fertility nitrogen containing compounds are added to the soil
  • Some of these fertilizers are […]
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The carburetor

By |2025-02-12T09:14:26+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A carburettor is an important part of the Petrol engine. Image credit MediaWiki A carburettor is an important part of the Petrol engine. Image credit MediaWiki ZIMSEC O Level Combined Science Notes: The carburetor

  • A carburettor is an essential part of Petrol engines
  • A typical carburettor has the following parts:
  • An […]
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Electrical Power

By |2025-02-12T09:30:22+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Electrical Power

  • Electric power is the rate of doing work or the rate of of using energy
  • Electric power is the rate which an electrical device is converting electrical energy into heat or light or any other form of energy e.g kinetic energy in an electric motor
  • When current flows through a wire some of […]
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The Alternating Current generator

By |2025-02-12T09:46:08+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A simple AC generator. Image credit electronics-tutorials.ws A simple AC generator. Image credit electronics-tutorials.ws ZIMSEC O Level Combined Science Notes: The Alternating Power generator

  • In an Alternating Current (AC) generator the current changes direction as the coil turns
  • An AC generator is made up a rectangular coil that rotates between the […]
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To investigate whether the length of a beam affects its strength

By |2025-02-12T09:11:03+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Testing the length and strength of beams Testing the length and strength of beams ZIMSEC O Level Combined Science Notes: Experiment:To investigate whether the depth of a beam affects its strength

Aim: To show how the length of a beam affects its strength

Materials: drinking straws, clamps, weights

Method

  1. Clamp the ends of a straw […]
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Experiment To show the effect of sulphuric acid on some materials

By |2025-02-12T09:27:31+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

The effects of acid rain. Image credit penguinsofchemistry.wordpress.com The effects of acid rain. Image credit penguinsofchemistry.wordpress.com ZIMSEC O Level Combined Science Notes: Experiment To show the effect of sulphuric acid on some materials

Aim: To show the effect of sulphuric acid on some materials

Materials: dilute sulphuric acid, wood, copper, plastic, iron, steel, aluminium, […]

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Pressure in liquids and the manometer

By |2025-02-12T09:01:22+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Pressure in liquids and the manometer

  • Gravity pulls a liquid down into its container
  • The liquid in turn exerts a pressure on the container
  • The pressure of a liquid at a certain depth is equal in all directions
  • The pressure of a liquid in a container increases with depth
  • This means in a container […]
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Substance Abuse: Smoking

By |2025-02-12T09:22:39+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A man smoking and selling Tobacco at an Auction floor. Image credit voanews.com A man smoking and selling Tobacco at an Auction floor. Image credit voanews.com ZIMSEC O Level Combined Science Notes: Substance Abuse: Smoking

  • In most countries including smoking is legal
  • It is also socially accepted
  • Cigarette smoke(tobacco smoke) contains […]
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Injection (Depo Provera)

By |2025-02-12T09:40:01+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Image credit star.ng Image credit star.ng ZIMSEC O Level Combined Science Notes:Contraception:Injection (Depo Provera)

  • Also simply known as Depo
  • It is an injection containing medroxyprogesterone, a contraceptive injection for women that contains the hormone progestin

How it works Depo provera Depo provera injection

  • Prevents the […]
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