May 2016

Social and economic factors to consider when using fuels

By |2022-09-15T12:38:52+02:00May 20th, 2016|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:
  • […]


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Efficiency: Diesel vs Petrol engines

By |2022-09-15T12:38:52+02:00May 20th, 2016|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 […]

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The Diesel engine

By |2022-09-15T12:38:53+02:00May 20th, 2016|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 […]

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The carburetor

By |2022-09-15T12:38:53+02:00May 20th, 2016|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 […]

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Fuel Engines

By |2022-09-15T12:38:54+02:00May 18th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Most cars use fuel engine. Image credit ecurrent.fit.edu/blog/

Most cars use fuel engine. Image credit ecurrent.fit.edu/blog/ ZIMSEC O Level Combined Science Notes: Fuel Engines
  • A machine is a device that changes energy from one form to another
  • When the energy used by the machine is chemical energy the machine is called […]

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Experiment:investigating fuel efficiency

By |2022-09-15T12:38:55+02:00May 18th, 2016|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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Fuel efficiency

By |2022-09-15T12:38:55+02:00May 18th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Fuel efficiency

  • Fuel efficiency measures the amount of energy that can be obtained from a given quantity of fuel
  • It is often useful to know which fuel gives the most energy(heat) per given unit
  • In a laboratory fuel efficiency can be determined by measuring the temperature rise of water when it is […]

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Experiment: Demonstrating that carbon dioxide extinguishes a burning flame

By |2022-09-15T12:38:56+02:00May 18th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Carbon dioxide extinguishes flames

Carbon dioxide extinguishes flames ZIMSEC O Level Combined Science Notes: Experiment: Demonstrating that carbon dioxide extinguishes a burning flame

Aim: to show that carbon dioxide extinguishes a flame

Materials:  3 different sized candles, vinegar, baking soda, beaker or plastic bottle, shallow dish

Method

  1. Place the 3 pieces of candle in a […]

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Experiment: Determining the best conditions for the production of ethanol

By |2022-09-15T12:38:56+02:00May 13th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Fermentation of glucose

Fermentation of glucose ZIMSEC O Level Combined Science Notes: Experiment: Determining the best conditions for the production of ethanol

Aim: To determine the best conditions for ethanol production

Materials: 5% glucose solution, 20% glucose solution, yeast, sodium hydroxide solution, mealie meal, dilute hydrochloric acid, thermometer, conical flask, cork, glass tube, test tube, […]


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Experiment: Distillation of alcohol

By |2022-09-15T12:38:57+02:00May 13th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Distillation of alcohol. Image credit bbc.co,uk

Distillation of alcohol. Image credit bbc.co,uk ZIMSEC O Level Combined Science Notes: Experiment: The distillation of ethanol

Aim: To concentrate alcohol using the distillation process

Materials: thermometer, clamp stands, rubber bungs, round bottomed flask, fractionating column. condenser with rubber tubing, watch-glass or tin lid, porcelain chips or clean dry sand

    […]

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