January 2023

Experiment: Copper plating an iron nail

By |2022-09-15T12:39:13+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Copper plating iron Copper plating iron ZIMSEC O Level Combined Science Notes:  Experiment: Copper plating an iron nail

Aim: Copper plating an iron nail

Materials: beaker, copper sulphate, dilute sulphuric acid, iron nail, copper electrode, amateur, 1.5V torch cells, sandpaper

Method

  1. In a beaker,make up 100 cm3 of solution containing 40g of copper sulphate
  2. Carefully add […]
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Types of fuel

By |2022-09-15T12:39:00+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Engen Garage. Image credit chronicle.co.zw Engen Garage. Image credit chronicle.co.zw ZIMSEC O Level Combined Science Notes: Types of fuel

  • A fuel is any type of material that can be made to react (commonly with oxygen) and release energy in the process
  • Fuel provides energy to a body/machine to do work
  • Fuels […]
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Electric cells: Introduction

By |2022-09-15T12:38:43+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Duracell electric cells. Image credit linkedin.com Duracell electric cells. Image credit linkedin.com ZIMSEC O Level Combined Science Notes: Introduction to electric cells

  • An electric cell converts chemical energy into electrical energy
  • Two metal electrodes are dipped into an electrolyte
  • During the chemical reaction that takes place in the cell
  • One electrode […]
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To investigate whether the length of a beam affects its strength

By |2022-09-15T12:38:26+02:00January 24th, 2023|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 |2022-09-15T12:38:19+02:00January 24th, 2023|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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Food Preservation

By |2022-09-15T12:38:04+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Perishable foods Perishable foods ZIMSEC O Level Combined Science Notes: Food Preservation

  • A lot of the fresh food that humans eat is perishable
  • This is because this food is also food for bacteria, fungi and other micro-organisms
  • If fresh perishable food is left out in the open it will soon deteriorate […]
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Pregnancy

By |2022-09-15T12:37:54+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Pregnancy

  • The vagina receives an erect penis during sexual intercourse
  • During sexual intercourse, sperms are ejaculated into the vagina
  • There they begin to swim up to the oviducts
  • If an ovum is released at this time it may be fertilised in the oviduct
  • Although many sperms reach the ovum only one will […]
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