Answer question numbers 4(a) - 4(d) on the basis of your understanding of the following paragraph and the related studied concepts. The metal sodium reacts with air and water. A student reacted sodium with water and measured the volume of gas at intervals of 30 seconds. The results are shown below. Time/s 0 30 60 90 120 150 180 Volume/cm3 0 40 60 74 56 96 140 At what time rate of reaction was fastest? 1m Name the gas liberated in the above reaction. Write the reaction involved. 1m How will you test this gas? 1m Which ions are responsible for the change in the colour of universal indicator? 1m
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Explanation:
if x=0,y=-1, find the value of
(i) x3-y3
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