February 2025

Coating metals/Protecting metals from corrosion

By |2025-02-12T09:31:18+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Investigating the rusting or iron Investigating the rusting or iron ZIMSEC O Level Combined Science Notes: Coating metals/Protecting metals from corrosion

  • Steel has many uses for example construction and to make utensiles
  • This is because it is cheap and strong
  • It is however susceptible to rusting
  • This is because it combines […]
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The Haber process and the Manufacture of Ammonia

By |2025-02-12T08:57:39+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

 ZIMSEC O Level Combined Science Notes: The Haber process and the Manufacture of Ammonia
  • Sable Chemicals produces ammonia at their Kwekwe plant
  • Ammonia is mainly used to make nitrogen fertilizers such as ammonium nitrate which are used in the agriculture industry
  • Ammonia is made using Hydrogen and Nitrogen
  • Hydrogen is obtained from electrolysis of water and
  • Nitrogen […]
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Fuel Engines

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

Most cars use fuel engine. Image credit ecurrent.fit.edu/blog/ Most cars use fuel engine. Image credit ecurrent.fit.edu/blog/ ZIMSEC O Level Combined Science Notes: Fuel Engines

  • A machine is a device that changes energy from one form to another
  • When the energy used by the machine is chemical energy the machine is called […]
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Resistors in parallel and in series

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

fusion_title size=”3″ content_align=”left” style_type=”default” sep_color=”” margin_top=”” margin_bottom=”” class=”” id=””]ZIMSEC O Level Combined Science Notes:  Resistors in parallel and in series [/fusion_title]

  • Resistance in a series can be changed by placing more or less resistors in a circuit
  • The total resistance of resistors depends in the way in which they are arranged in the circuit
  • Resistors can be put in series or […]
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Electromagnetic Induction

By |2025-02-12T09:43:51+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Inducing a current using a magnet. Image credit youtube.com Inducing a current using a magnet. Image credit youtube.com ZIMSEC O Level Combined Science Notes: Introduction:Motors and generators

  • Electromagnetic induction- is the production of a voltage across an wires (electrical conductor )due to its dynamic interaction with a magnetic field.
  • If a magnet […]
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Demonstrating compression and tensile forces

By |2025-02-12T09:08:17+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Demonstrating tension and compression forces Demonstrating tension and compression forces ZIMSEC O Level Combined Science Notes: Experiment: Demonstrating compression and tensile forces

Aim:  To demonstrate compression and tensional(stretching forces)

Materials: glue, tissue paper, rubber, two small blocks of wood, plastic ruler/rubber hose

Method Demonstrating tension and compression forces. Image credit MediaWiki

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Factors to consider when choosing construction materials

By |2025-02-12T09:23:47+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A house built using Eco friendly materials. Image credit asiagreenbuildings.com A house built using Eco friendly materials. Image credit asiagreenbuildings.com ZIMSEC O Level Combined Science Notes: Factors to consider when choosing construction materials

  • The choice of building material depends mainly on the properties of the materials and
  • The purpose of the […]
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Machines: Pulleys

By |2025-02-12T09:41:07+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Wooden pulleys. Image credit wisegeek.com Wooden pulleys. Image credit wisegeek.com ZIMSEC O Level Combined Science Notes: Machines: Pulleys

  • A pulley is a basic device or machine made of a wheel with a rim that a chain/cord/rope fits around
  • A single fixed pulley as shown below is used to change the direction […]
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Experiment: Food and Energy

By |2025-02-12T09:14:50+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Burning food to to test its energy content Burning food to to test its energy content ZIMSEC O Level Combined Science Notes: Experiment: Food and Energy

Aim: Comparing the energy value of foods

Materials: burners, small containers/beakers to hold the water, food holders, thermometers, different types of starchy and fatty foods

Method

  1. Set up the apparatus […]
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Reproduction in Humans

By |2025-02-12T09:31:34+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A Zimbabwean family A Zimbabwean family ZIMSEC O Level Combined Science Notes: Reproduction in Humans

  • Human being produce sexually
  • The process involves the fusion (joining) of the nuclei (sex cells) of the male gamete (sperm)
  • and the female gamete (ovum)
  • To form a zygote
  • The human and female sexual organs take […]
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