Otsused 1
the 114
7
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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6.
7.
Property of the Government of Kenva​

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.

the answer is option a.

explanation:

two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.

two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.