A mixture of iron and sulpher. Image credit MediaWiki ZIMSEC O Level Combined Science Notes: Mixtures and compounds
ZIMSEC O Level Combined Science Notes: Experiment: The reaction of metals and water
Aim: Investigating and Observing the reactions of metals and water
Materials: calcium, magnesium, zinc, lead, iron, copper, beaker, test tubes, filter funnel, water, splint, burner, universal indicator
Some metals like calcium react with water.
Method
ZIMSEC O Level Combined Science Notes: Experiment: Investigating the gas produced by acids and carbonates
Aim: To investigate the reaction of acids and carbonates and the gas that is produced
Materials: sodium corbonate/sodium hydrogen carbonate (baking soda), dilute hydrochloric acid/vinegar, lime water/ligted splint, 2 test tubes
Acids and carbonates […]
ZIMSEC O Level Combined Science Notes: Extraction of iron: The blast furnace
The structure of a blast furnace. Image credit s-cool.co.uk
Nickel and Chrome plate. Image credit 1911forum.com ZIMSEC O Level Combined Science Notes: Experiment Chrome plating a nickel cathode
Aim: To chrome plate a nickel cathode
Materials: nickel-plated electrode, lead electrode, beaker, chromic acid
Method
Coal Mining at Hwange. Image credit chronicle.co.zw ZIMSEC O Level Combined Science Notes: Coal fuel
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
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Polarisation in a simple cell ZIMSEC O Level Combined Science Notes: Perfecting the electric cell
Voltage/Potential difference
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Roof trusses. Image credit myrooff.com ZIMSEC O Level Combined Science Notes: Introduction to Trusses
Generators have many uses.Image credit wheelerdealers.co.zw ZIMSEC O Level Combined Science Notes: Uses of generators 
