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State ways of reducing surface tension in water.
Date posted:
February 6, 2017
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A bag of sugar is found to have the same weight on planet earth as an identical bag of dry sawdust on planet Jupiter. Explain why the masses of the two bags must be different.
Date posted:
February 6, 2017
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A metal pin was observed to float on the surface of pure water. However the pin sank when a few drops of soap solution were carefully added to the water. Explain this observation
Date posted:
February 6, 2017
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State the reason why water spilled on a glass surface wets the surface.
Date posted:
February 6, 2017
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A butcher has a beam balance and masses 0.5 kg and 2 kg. How would he measure 1.5 kg of meat on the balance at once?
Date posted:
February 6, 2017
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Give reason why the weight of the body varies from place to place.
Date posted:
February 6, 2017
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A student measured the length of a wire four times using a metre rule and obtained the following readings: 18.6 cm; 18.5 cm and 18.6 cm. Determine the length the length the student should record
Date posted:
February 6, 2017
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State the reason why it is not correct to quote the weight of solid objects in kilograms
Date posted:
February 6, 2017
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A stopwatch started 0.50s after the start button was pressed. The time recorded using the stopwatch for a ball bearing falling through a liquid was 2.53s. Determine the time of fall.
Date posted:
February 6, 2017
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A drug manufacturer gives the mass of the active ingredient in a tablet as 5 mg. Express this quantity in kilogramme and in standard form.
Date posted:
February 6, 2017
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A certain matchstick head contains potassium chlorate and sulphur. On striking, the two subtances react to produce sulphur (IV) oxide and potassium chloride. Explain the environmental effect of using such matches in large numbers.
Date posted:
February 6, 2017
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When a solid sample of sulphur is heated in a test tube, it changes into a liquid which flows easily. On further heating, the liquid darkens and does not flow easily. Explain these observations.
Date posted:
February 6, 2017
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In an attempt to prepare sulphur (IV) oxide gas, dilute sulphuric (VI) acid was reacted with barium sulphite. The yield of sulphur (IV) oxide was found to be negligible. Explain
Date posted:
February 6, 2017
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On heating a pale green solid K, carbon (IV) oxide gas and black solid M were formed. On reacting K with dilute hydrochloric acid, carbon (IV) oxide gas and green solution S were formed. When excess aqueous ammonia was added to solution S, a deep blue solution was formed.
a) Identify the cation in solid K
b) Identify the two anions in solution S
Date posted:
February 6, 2017
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Describe how formation of nitrogen (II) oxide in the internal combustion engine leads to gaseous pollution.
Date posted:
February 6, 2017
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Give a reason why nitrogen (II) oxide is not formed at room temperature.
Date posted:
February 6, 2017
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Describe the process by which Nitrogen is obtained from air on a large scale.
Date posted:
February 6, 2017
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The use of materials made of lead in roofing and in water pipes is being discouraged. State:
i) Two reasons why these materials have been used in the past
ii) One reason why their use is being discouraged
Date posted:
February 6, 2017
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Explain why a high temperature is required for nitrogen to react with oxygen.
Date posted:
February 6, 2017
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Nitrogen (II) oxide and nitrogen (IV) oxide are some of the gases released from car exhaust pipes. State how these gases affect the environment.
Date posted:
February 6, 2017
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Concentrated nitric (V) acid was added to Iron (II) sulpahate acidified with dilute sulphuric (VI) acid the mixture heated. The solution turned from pale green to yellow with evolution of brown gas. Explain these observations.
Date posted:
February 6, 2017
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How did Ghana’s independence contribute to the liberation of other African countries?
Date posted:
February 6, 2017
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What were the contributions of religion in Maji Maji uprising?
Date posted:
February 6, 2017
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Give two factors which limit parliamentary supremacy in Britain.
Date posted:
February 6, 2017
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Identify two political factors leading to decline of Trans-Atlantic trade.
Date posted:
February 6, 2017
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Explain the problems associated with indirect rule system of government.
Date posted:
February 6, 2017
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Outline five features of direct rule in Zimbabwe.
Date posted:
February 6, 2017
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What factors promoted African nationalism in South Africa after 1945?
Date posted:
February 6, 2017
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State five factors that led to the abolition of slave trade.
Date posted:
February 3, 2017
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What problems face archaeologist in their work of rewriting history using unwritten sources?
Date posted:
February 3, 2017