February 2025

Experiment: Investigating the effects of concentration on marble chips

By |2025-02-12T09:15:36+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Concentration varies directly with the rate of reaction Concentration varies directly with the rate of reaction ZIMSEC O Level Combined Science Notes: Experiment: Investigating the effects of concentration on marble chips

Aim: To investigate the effect of concentration on the reaction between marble chips and hydrochloric acid

Materials : conical flask/glass jam jars, measuring cylinder, […]

Read More
Comments Off on Experiment: Investigating the effects of concentration on marble chips

Experiment: Separating copper from its oxides

By |2025-02-12T09:30:43+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Experiment: Separating copper from its oxides

Aim: To separate copper from its oxide ores

Materials: copper oxide, iron nail, dilute sulphuric acid, filter funnel, 2 beakers, stirring rod, filter paper, burner

Extracting copper from copper oxide Extracting copper from copper oxide

Method

  1. Place a small amount of copper oxide in a […]
Read More
Comments Off on Experiment: Separating copper from its oxides

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 […]
Read More
Comments Off on The Manufacture of sulphuric acid

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 […]

Read More
Comments Off on Experiment:investigating fuel efficiency

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 […]
Read More
Comments Off on Experiment: Finding the resistance of a resistor using a voltmeter

Introduction:Generators and Motors

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

Hwange Power Plant. Image credit chronicle.co.zw Hwange Power Plant. Image credit chronicle.co.zw ZIMSEC O Level Combined Science Notes: Introduction:Motors and generators

  • Due to their nature batteries and cells produce a limited amount of electrical power
  • A lot of the electricity used in homes and industries comes from generators
  • Generators convert kinetic […]
Read More
Comments Off on Introduction:Generators and Motors

Reinforced concrete and stone properties and structures

By |2025-02-12T09:22:52+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Reinforced concrete. Image credit surfcivil.blogspot.com Reinforced concrete. Image credit surfcivil.blogspot.com ZIMSEC O Level Combined Science Notes: Metal and metal alloy properties and their construction uses

  • Often building materials are combined when building a structure
  • The most common such mixture is reinforced concrete
  • It is a mixture of steel and concrete
  • Steel is […]
Read More
Comments Off on Reinforced concrete and stone properties and structures

Experiment:Finding the mechanical advantage of an inclined plane

By |2025-02-12T09:40:29+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Experiment:Finding the mechanical advantage of an inclined plane

Aim: Finding the Mechanical Advantage of an inclined plane

Materials: 1m long plank, sandpaper, bricks. cotton reel, nails, thick steel wire, wood block (smoothed on the underside) weights/tin and sand, pliers, string, spring balance/scales

Finding the mechanical of an inclined plane Finding the […]

Read More
Comments Off on Experiment:Finding the mechanical advantage of an inclined plane

Experiment: To show how a hydraulic Machine increases force

By |2025-02-12T09:11:40+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Syringes showing how a hydraulic machine works Syringes showing how a hydraulic machine works ZIMSEC O Level Combined Science Notes: Experiment: To show how a hydraulic Machine increases force

Aim: To show how a hydraulic machine increases force

Materials:  small syringe, syringe with larger diameter, plastic tube, water, ruler

Method

  1. Half fill the large syringe […]
Read More
Comments Off on Experiment: To show how a hydraulic Machine increases force
Toggle Sliding Bar Area
Go to Top