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Distinguish between soft and hard magnetic materials
Date posted:
February 7, 2017
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Given a bar magnet, an iron bar and a string
i) Describe a simple experiment to distinguish between the magnet and the iron bar
(ii) State with reasons the observations that would be made in the experiment.
Date posted:
February 7, 2017
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Give reason why attraction in magnetism is not regarded as reliable method of testing for polarity
Date posted:
February 7, 2017
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A sample of hydrogen chlorine was dissolved in water to make 250 cm3 of solution 25 cm3 of the solution required 46 cm3 of 11.0 M sodium hydroxide for complete neutralization
i) Calculate the number of moles of hydrochloric acid in 25 cm3 of solution
ii) Determine the mass of hydrogen chloride that was dissolved to make 250 cm3 of solution (Cl = 35.5, H = 1.0)
Date posted:
February 7, 2017
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In an experiment, sulphur (IV) oxide was dissolved in water to form solution L.
i) What would be observed if a few drops of barium nitrate solution were immediately added to solution L?
ii) Write an ionic equation for the reaction that occurred between solution L and aqueous barium nitrate in (i) above.
Date posted:
February 7, 2017
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What would be observed if sulphur (IV) oxide is bubbled through acidified potassium manganate (VII)?
Date posted:
February 7, 2017
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Name two reagents that can be used to prepare hydrogen sulphide in the laboratory
Date posted:
February 7, 2017
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a) State the observation made at the end of the experiment when a mixture of iron powder and sulphur is heated in a test tube
b) When a mixture of iron powder and sulphur is heated, it glows more brightly than that of iron fillings and sulphur. Explain this observation
Date posted:
February 7, 2017
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When hydrogen sulphide gas was bubbled into an aqueous solution of iron (III) chloride, a yellow precipitate was deposited.
a) State another observation made
b) Write an equation for the reaction that took place
c) What type reaction was undergone by hydrogen sulphide in this reaction?
Date posted:
February 7, 2017
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In an experiment to study the properties of concentrated sulphuric (IV) acid, a mixture of the acid and wood charcoal was heated in a boiling tube.
a) Write the equation of the reaction that took place in the boiling tube
b) Using oxidation numbers, show that reduction and oxidation reactions took place in the boiling tube.
Date posted:
February 7, 2017
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In an experiment, a gas jar containing moist sulphur (IV) oxide was inverted over another gas jar containing hydrogen sulphide gas.
a) state and explain the observation that was made
b) state the precaution that should be taken when carrying out this experiment
Date posted:
February 7, 2017
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State the reason for topping up a lead-acid accumulator with distilled water.
Date posted:
February 7, 2017
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State one advantage of a lead-acid accumulator over a nickel-iron(NiFe) accumulator.
Date posted:
February 7, 2017
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A car battery requires topping up with distilled water occasionally. Explain why this is necessary and why distilled water is used
Date posted:
February 7, 2017
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State two advantages of an alkaline battery over a lead acid battery.
Date posted:
February 7, 2017
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State two uses of a charged gold leaf electroscope.
Date posted:
February 7, 2017
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A positively charged sphere is suspended by an insulating thread. A negatively charged conductor is suspended near it. The conductor is first attracted, after touching the sphere it is repelled. Explain this observation
Date posted:
February 7, 2017
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A conductor is slowly brought near the cap of a positively charged electroscope. The leaf first collapses and then diverges. State the charge on the conductor
Date posted:
February 7, 2017
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A positively charged rod is brought near the cap of a leaf electroscope. The cap is the earthed momentarily by touching with the finger. Finally the rod is withdrawn. The electroscope is found to be negatively charged. Explain how this charge is acquired.
Date posted:
February 7, 2017
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A highly negatively charged rod is gradually brought close to the cap of a positively charged electroscope. It is observed that the leaf collapses initially and then diverges. Explain the observation.
Date posted:
February 7, 2017
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In certain pinhole camera, the screen is 10cm from the pinhole. When the camera is placed 6 m away from a tree, a sharp image of the tree 16 cm high is formed on the screen. Determine the height of the tree
Date posted:
February 7, 2017
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Name one country in Africa that was not colonized by British but is member of the Commonwealth.
Date posted:
February 7, 2017
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Identify two demand made by Austria-Hungary against Serbia following the assassination of Archduke Ferdinand.
Date posted:
February 7, 2017
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Give one main function of the royal fire in the Mwene Mutapa kingdom.
Date posted:
February 7, 2017
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State two roles of the Takshiffs during the Trans-Saharan trade.
Date posted:
February 7, 2017
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Name one commune in Senegal where assimilation policy was successful.
Date posted:
February 7, 2017
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Name any two countries that were colonized by Portugal in Africa.
Date posted:
February 7, 2017
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State one term of the Industrial Conciliation Act of 1934 in Zimbabwe.
Date posted:
February 7, 2017
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Who were the first people to use iron in the world?
Date posted:
February 7, 2017
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Name two industries established by early man.
Date posted:
February 7, 2017