Otsused 1
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Summary
Juris a mixture of SER
Oxygen and water are necessary for rento
Ruis mainly hydratet fron (1) oxide
Atatosphese pollution is caused by presence of harmful asesin
A catalyst after the rate of a reaction
Most metals burn in oxygen to form basde oxides
Most non metais burn in oxygen to form acide oxide
Some non metal bum in oxygen to form neutral oxudes
Addition of oxygen to a substance is called oxidation
th Removal of oxygen from a substance is called reduction
The ability of a metal to compete for combined oxygen depends
on the position of that metal in the Reactivity Series,
Revision Exercise
Explain observation made when anhydrous calcium chloride and anhydrous copper
a sulphate are separately exposed to the atmosphere for about two days.
Describe an experiment to show that there is increase in mass when magnesium is
burned in air.
Is air a mixture or a compound? Explain.
Explain why ears in the coastal city of Mombasa rust faster than cars in Kisumu City.
State one advantage and three disadvantages of rusting.
List some industrial plants in Kenya and indicate the gaseous pollutants they emit.
Describe an experiment for the preparation and collection of oxygen from sodium
peroxide.
8. The apparatus below were used to determine the volume of oxygen in air. About
200cm of air were passed repeatedly from syringe A to syringe B over heated copper
turnings as shown in the diagram.
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7.
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