January 2023

The carburetor

By |2022-09-15T12:38:53+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

A carburettor is an important part of the Petrol engine. Image credit MediaWiki

A carburettor is an important part of the Petrol engine. Image credit MediaWiki ZIMSEC O Level Combined Science Notes: The carburetor
  • A carburettor is an essential part of Petrol engines
  • A typical carburettor has the following parts:
  • An […]

    Quick NetOne, Econet, And Telecel Airtime Recharge

Comments Off on The carburetor

The Diesel engine

By |2022-09-15T12:38:53+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Honda Diesel Engine. Image credit forum.cardekho.com

Honda Diesel Engine. Image credit forum.cardekho.com ZIMSEC O Level Combined Science Notes: The Diesel engine
  • Operates in almost the same way as the Petrol Engine apart from certain differences:
  • They use diesel instead of Petrol
  • Have no spark plugs
  • Have a fuel injector instead […]

    Quick NetOne, Econet, And Telecel Airtime Recharge

Comments Off on The Diesel engine

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 […]

    Quick NetOne, Econet, And Telecel Airtime Recharge

Comments Off on Types of fuel

Efficiency: Diesel vs Petrol engines

By |2022-09-15T12:38:52+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Petrol vs Diesel Engines. Image credit carblogindia.com

Petrol vs Diesel Engines. Image credit carblogindia.com ZIMSEC O Level Combined Science Notes: Efficiency: Diesel vs Petrol engines
  • Efficiency refers to the fuel economy of an engine
  • It measures the amount of chemical energy in the fuel that is converted to kinetic energy
  • The […]

    Quick NetOne, Econet, And Telecel Airtime Recharge

Comments Off on Efficiency: Diesel vs Petrol engines

Experiment: Burning fuels

By |2022-09-15T12:39:00+02:00January 24th, 2023|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, […]

    Quick NetOne, Econet, And Telecel Airtime Recharge

Comments Off on Experiment: Burning fuels

Social and economic factors to consider when using fuels

By |2022-09-15T12:38:52+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Oil spills are destructive to vegitation. Image credit africanewscircle.com

Oil spills are destructive to vegetation. Image credit africanewscircle.com ZIMSEC O Level Combined Science Notes: Social and economic factors to consider when using fuels
  • The extraction and consumption of fuels has led to a lot of problems in recent years
  • Problems include:
  • […]


    Quick NetOne, Econet, And Telecel Airtime Recharge

Comments Off on Social and economic factors to consider when using fuels

Coal as a fuel

By |2022-09-15T12:38:59+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Coal Mining at Hwange. Image credit chronicle.co.zw

Coal Mining at Hwange. Image credit chronicle.co.zw ZIMSEC O Level Combined Science Notes: Coal fuel
  • Coal is a common solid fuel
  • It is a non-renewable resource
  • It is used as a raw material by industries such as at ZISCO and less commonly as a […]

    Quick NetOne, Econet, And Telecel Airtime Recharge

Comments Off on Coal as a fuel

The manufacture of coke at Hwange

By |2022-09-15T12:38:59+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Raw Coke. Image credit MedialWiki

Raw Coke. Image credit MedialWiki ZIMSEC O Level Combined Science Notes: The manufacture of coke at Hwange
  • Coke is a hard prous residue formed when coking coal is heated to 1250°C in the absence of air
  • It is almost pure carbon
  • It is often used as […]

    Quick NetOne, Econet, And Telecel Airtime Recharge

Comments Off on The manufacture of coke at Hwange

Experiment:Making coke and collecting the resulting gases

By |2022-09-15T12:38:58+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Making coke

Making coke ZIMSEC O Level Combined Science Notes: Experiment:Making coke and collecting the resulting gases

Aim: To make coke using coal and collect the gas and liquid by-products

Materials: crushed coal, test tubes, glass tubing, splints, lead ethanoate solution, filter paper, red and blue litmus paper, sodium hydroxide solution, beaker, water, trough, […]


Quick NetOne, Econet, And Telecel Airtime Recharge

Comments Off on Experiment:Making coke and collecting the resulting gases

Biogas as a source of energy

By |2022-09-15T12:38:58+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Biogas as a source of energy

  • Biogas is the gas that is obtained from fermenting manure and other organic waste
  • It is a mixture of methane, carbon dioxide and hydrogen sulphide
  • Cattle manure is commonly used as a waste to feed biogas plants
  • Small plants have been built in some parts of Zimbabwe
  • […]


    Quick NetOne, Econet, And Telecel Airtime Recharge

Comments Off on Biogas as a source of energy
Go to Top