February 2025

Pumps: Force pump

By |2025-02-12T09:04:42+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A solar force pump. Image credit sunfuel.co.in A solar force pump. Image credit sunfuel.co.in ZIMSEC O Level Combined Science Notes: Pumps: Force pump

  • A force pump:
  • Has a cylinder, piston, two valves and a spout (outlet)
  • It makes use of atmospheric pressure to force fluid/water into the pump through valves
  • The […]
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Substance abuse: Alcohol

By |2025-02-12T09:23:13+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Glasses of wine. Image credit pickywallpapers.com Glasses of wine. Image credit pickywallpapers.com ZIMSEC O Level Combined Science Notes: Substance Abuse: Alcohol

  • Alcohol is a legal and socially acceptable drug
  • It is however a poison
  • It is addictive and can lead to ill-health and even death
  • It is a depressant drug
  • It […]
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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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Kupatsanura Zviito

By |2025-02-12T09:26:50+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Image credit necessarywriters.com Image credit necessarywriters.com ZIMSEC O Level Shona Notes: Kupatsanura Zviito

  • Chiito chega chega chinogona kupatsanurwa tichibuditsa chidumbu chimwe nechimwe chakachiumba.
  • Zvidimbu izvi zvinonzi zvivakiso kana kuti zvivakazwi.
  • Chivakazwi chimwe nechichimwe chinenge chiine basa rachinoita pachiito chachinovanikwa.
  • Pabvunzo dzeShona panogona kuuya mubvunzo unenge uchida kuti iwe upatsanure chiito uchibuditsa zvivakazwi zvinenge zvakachiumba.
  • Unofanira […]
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Diffusion and Osmosis experiments: Visking Tubing/Egg membrane

By |2025-02-12T09:05:48+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A person tying the visking tubing. Image credit YouTube. A person tying the visking tubing. Image credit YouTube. ZIMSEC O Level Combined Science Notes:Diffusion and Osmosis experiments

Aim: Create a membrane model for molecules and their movement.

Materials

Visking tubing/egg membrane, string, beaker, 20% sugar solution, weighing balance, water.

Method A

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Examining adaptations of flowers to pollination

By |2025-02-12T09:25:46+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A bird pollinating a flower. Image credit gilligalloubird.com 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: Testing the infiltration capacity of soils

By |2025-02-12T09:44:29+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Testing infiltration in soils Testing infiltration in soils ZIMSEC O Level Combined Science Notes: Testing the infiltration capacity of soils

Materials: Tins with their tops and bottoms removed, water

Method

  1. Gently push the tins into the ground, make sure that they are in different soil types
  2. Pour 100ml of water into the cylinders and measure […]
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Isotopes and the importance of proton numbers

By |2025-02-12T09:06:50+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

The three isotopes of hydrogen. Image credit wikipedia.org 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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