ZIMSEC O Level Combined Science Notes: Biogas as a source of energy
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ZIMSEC O Level Combined Science Notes: Ethanol as a source of energy
Fermentation of glucose ZIMSEC O Level Combined Science Notes: Experiment: making ethanol
Aim: To make ethanol by fermenting glucose
Materials: conical flask/plastic bottle, cork, glass/rubber tube,lime water, 5% glucose solution, yeast, mealie meal
Method
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
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, […]
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
ZIMSEC O Level Combined Science Notes: Fuel efficiency
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 […]
