The human digestive system. Image credit airurbano.com ZIMSEC O Level Combined Science Notes: Alimentary Systems
Germinating seeds. Image credit hummert.com ZIMSEC O Level Combined Science Notes: Experiment: Is energy released by germinating seeds?
Aim: Determine whether energy is released when seeds are germinating.
Hypothesis: Seeds are structures produced by plants (living organisms). They respire when they are germinating.
Materials: tow insulated containers/vacuum flasks, two supporting […]
The main parts of the human circulatory system. Image credit organsofthebody.com ZIMSEC O Level Combined Science Notes: The circulatory system of mammals
Loam soil. Image credit betterground.org ZIMSEC O Level Combined Science Notes: The physical components of the soil
Sand, Loam and […]
Nitrogen fixing roots in legumes. Image credit MediaWiki ZIMSEC O Level Combined Science Notes: The nitrogen cycle
Cooling naphthalene ZIMSEC O Level Combined Science Notes: Experiment: the cooling curve of naphthalene
Materials: test tube, naphthalene, thermometer, hot water, burner, stand, clamp
Be careful as naphthalene vapour is poisonous: you can wear a breathing mask to reduce the risk of you inhaling the vapour
Method
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ZIMSEC O Level Combined Science Notes: Experiment: The corrosion of metals by acids
Aim: Investigating the corrosion of some metals by acids
The corrosion of metals by acid gives off hydrogen gas
Materials: 5 test tubes, dilute hydrochloric acid, granulated zinc, iron fillings/iron nail, copper foil, […]
Iron mining in Zimbabwe. Image credit miningzimbabwe.com ZIMSEC O Level Combined Science Notes: The metal iron
Nickel plating copper ZIMSEC O Level Combined Science Notes: Experiment: Nickel platting a piece of copper sheet
Aim: To nickel plate a piece of copper
Materials: beaker, nickel sulphate, boric acid, burner, nickel electrode, 1.5 v cell, copper electrode/copper plated item, universal indicator
Method
