February 2025

Deficiency Diseases

By |2025-02-12T09:16:24+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Iodised salt can prevent iodine deficiency Iodised salt can prevent iodine deficiency ZIMSEC O Level Combined Science Notes: Deficiency Diseases

  • A person might suffer from a deficiency disease if their diet lacks certain essential minerals and vitamins
  • Two essential minerals and vitamins are:
  • Iodine and
  • Vitamins

Iodine Goitre is a [...] </p srcset=

Read More
Comments Off on Deficiency Diseases

The reactions of metals and water

By |2025-02-12T09:34:49+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: The reactions of metals and water

  • Water is a compound of oxygen and hydrogen
  • When metals react with water they remove the oxygen from the water
  • We say the metals displace the hydrogen from the water
  • A metal oxide is formed
  • Freeing up the oxygen
  • The following word equation summarizes the nature of […]
Read More
Comments Off on The reactions of metals and water

Experiment: The corrosion of metals by acids

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

ZIMSEC O Level Combined Science Notes: Experiment: The corrosion of metals by acids

Aim: Investigating the corrosion of some metals by acids

The corrosion of metals by acid gives off hydrogen gas The corrosion of metals by acid gives off hydrogen gas

Materials: 5 test tubes, dilute hydrochloric acid, granulated zinc, iron fillings/iron nail, copper foil, […]

Read More
Comments Off on Experiment: The corrosion of metals by acids

Experiment: Nickel plating a piece of copper sheet

By |2025-02-12T09:34:35+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Nickel plating copper Nickel plating copper ZIMSEC O Level Combined Science Notes:  Experiment: Nickel platting a piece of copper sheet

Aim: To nickel plate a piece of copper

Materials: beaker, nickel sulphate, boric acid, burner, nickel electrode, 1.5 v cell, copper electrode/copper plated item, universal indicator

Method

  1. In a beaker make 20cm3 a solution using 54g […]
Read More
Comments Off on Experiment: Nickel plating a piece of copper sheet

Experiment: Burning fuels

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

Burning Fuels Burning Fuels ZIMSEC O Level Combined Science Notes: Experiment: Burning fuels

Aim: To burn and investigate the nature of fuels

Materials: methylated spirits/alcohol, candle, meths burner, bunsen burner, paraffin, tin lid or porcelain dish, tongs

Method

  1. Light a meths burner and observe the flame
  2. Burn a small amount of alcohol on a tine lid, […]
Read More
Comments Off on Experiment: Burning fuels

Electric cells: Introduction

By |2025-02-12T09:33:41+02:00February 12th, 2025|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 […]
Read More
Comments Off on Electric cells: Introduction

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 […]
Read More
Comments Off on To investigate whether the length of a beam affects its strength
Toggle Sliding Bar Area
Go to Top