February 2025

The Manufacture of sulphuric acid

By |2025-02-12T08:56:03+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: The production of sulphuric acid

  • Sulphuric acid is produced using the Contact process
  • In Zimbabwe there is a sulphuric acid production plant at Zimphos in Harare
  • Sulpher or iron pyrites (iron sulphide) is roasted to form sulphur dioxide
  • The word equation for roasting iron pyrites is:
  • \text{iron sulphide+oxygen}\rightarrow\text{iron oxide+sulpher dioxide}
  • The word […]
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Experiment:investigating fuel efficiency

By |2025-02-12T09:11:59+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Testing fuel to determine its energy content Testing fuel to determine its energy content ZIMSEC O Level Combined Science Notes: Experiment:investigating fuel efficiency

Aim: To determine the amount of heat liberated when different liquid fuels burn

Materials:  2 spirit burners, wooden block, clamp and stand, meths, paraffin, thermometer, draught shields, clamp, beaker, water, tripod […]

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Experiment: Finding the resistance of a resistor using a voltmeter

By |2025-02-12T09:26:37+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes:  Experiment: Finding the resistance of a resistor using a voltmeter

Aim:  To find the resistance of a resistor in a circuit using voltmeter

Materials: cells, ammeter, resistor,switch, leads with crocodile clips

Finding Resistance

Method

  1. Set up the circuit as shown above
  2. Close the switch
  3. Read and record values of the […]
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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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Testing the strength of various beams

By |2025-02-12T09:09:02+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Testing the strength of beams Testing the strength of beams ZIMSEC O Level Combined Science Notes: Experiment: Testing the strength of various beams

Aim: To make different shaped beams and test their strength

Materials:  thin pieces of poplar wood, sharp knife, weights, 2 clamps, 2 bricks

  1. Cut beams about 20cm long with different cross-sectional […]
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Experiment: Comparing the strength of natural timber and other construction materials

By |2025-02-12T09:25:11+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Comparing the strength of various materials Comparing the strength of various materials ZIMSEC O Level Combined Science Notes: Experiment: Comparing the strength of natural timber and other construction materials

Aim: To compare the strength of some natural timbers and other materials

Materials: Plywood, hard wood cut across the grain, soft wood cut along the grain, […]

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Food Preservation

By |2025-02-12T09:18:49+02:00February 12th, 2025|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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Contraception:Ways to prevent pregnancy

By |2025-02-12T09:37:24+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

There are several major methods of contraception. Image credit relationshipplaybook.com There are several major methods of contraception. Image credit relationshipplaybook.com ZIMSEC O Level Combined Science Notes:Contraception:Ways to prevent pregnancy

  • Contraception-the deliberate use of artificial methods or other techniques to prevent pregnancy as a consequence of sexual intercourse
  • Common methods of contraception […]
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