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The set-up below was used to electroplate a metallic spoon. Study it and answer the questions that follow.
a) Write an ionic equation for the reaction that occurred at the cathode
b) State and explain what happened to the anode.
Date posted:
April 27, 2017
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100 cm3 of 2 M sulphuric (VI) acid was electrolyzed using the set-up represented by the diagram below
i) Write an equation for the reaction that produces gas L.
ii) Describe how gas K can be identified
iii) Explain the difference in:
I. The volume of the gases produced at the electrodes.
II. Brightness of the bulb if 100 cm3 of 2 M ethanoic acid was used in place of sulphuric (VI) acid.
Date posted:
April 27, 2017
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The diagram below represents a mercury cell that can be used in the industrial manufacture of sodium hydroxide. Study it and answer the questions that follow.
i) Name
I. The raw material introduced at 2
II. another substance that can be used in the cell instead of graphite.
ii) Identify the by – product that comes out at 1
iii) Give
I. One use of sodium hydroxide
II. Two reasons why mercury is recycled.
Date posted:
April 27, 2017
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The set-up below was used during the electrolysis of aqueous magnesium sulphate using inert electrodes.
a) Name a suitable pair of electrodes for this experiment.
b) Identify the anions and cations in the solution.
c) Explain the change that occurred to the concentration of magnesium sulphate solution during the experiment
Date posted:
April 27, 2017
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The set –up below was used to electrolyse aqueous copper (II) sulphate.
a) Explain why the bulb light brightly at the beginning of the experiment and becomes dim after sometimes.
b) Write the ionic equation of the reaction that took place at the cathode.
Date posted:
April 27, 2017
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Ammonia gas is used to manufacture nitric (V) acid as shown below.
i) This process requires the use of a catalyst. In which unit is the catalyst used?
ii) Identify compound A and B.
Date posted:
April 27, 2017
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A student set up the apparatus as shown in the diagram below to prepare and collect dry
Ammonia gas
i) Identify two mistakes in the set up and give a reason for each mistake.
ii) Name a suitable drying agent for ammonia.
iii) Describe one chemical test for ammonia gas
Date posted:
April 27, 2017
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Figure 4 shows the heating curve for water.
i) Give the names of the intermolecular forces of attraction in the segments:
I. MN
II. RS
ii) The heats of fusion and vaporization of water are 334.4 Jg-1 and 1159.4 g-1 respectively
I. Explain why there is a big difference between the two.
II. How is the difference reflected in the curve?
Date posted:
April 27, 2017
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The table below shows the pH values of solutions A, B, C and D.
Select solutions in which a sample of lead (II) hydroxide is likely to dissolve. Give reasons for each solution selected.
Date posted:
April 27, 2017
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The table below gives the solubilities of substances T and U at 10o C and 40oC
When an aqueous mixture containing 55 g of T and 12 g of U at 80o C was cooled to 10oC, crystals formed.
a) Identify the crystals formed.
b) determine the mass of the crystals formed
c) Name the method used to obtain the crystals
Date posted:
April 27, 2017
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State the reasons why Kabaka Mwanga collaborated
Date posted:
April 27, 2017
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State three reasons that influenced Lewanika to collaborate
Date posted:
April 27, 2017
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Discuss the results of Chimurenga war
Date posted:
April 27, 2017
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Explain five reasons why the Ndebele and Shona were defeated
Date posted:
April 27, 2017
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State six causes of the Chimurenga war
Date posted:
April 27, 2017
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Outline the Consequences of the Ndebele war
Date posted:
April 26, 2017
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What were the effects of Samoure’s resistance?
Date posted:
April 26, 2017
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Outline six reasons for Samore’s defeat
Date posted:
April 26, 2017
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State five factors the enabled Samore Toure to resist for long
Date posted:
April 26, 2017
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Outline three causes of the Franco – Mandika War (1891 - 1898)
Date posted:
April 26, 2017
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What were the negative effects of Maji Maji rebellion?
Date posted:
April 26, 2017
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State the positive results of the Maji Maji rebellion
Date posted:
April 26, 2017
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State five reasons why Africans were defeated in the Maji Maji rebellion.
Date posted:
April 26, 2017
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Outline the causes of the Maji Maji rebellion
Date posted:
April 26, 2017
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Discuss the Impact of partition in Africa
Date posted:
April 26, 2017
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State the terms of the Berlin Conference (1884 - 1885)
Date posted:
April 26, 2017
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Identify social factors that led to the scramble for colonies in Africa
Date posted:
April 26, 2017
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Identify economic factors that led to the scramble for colonies in Africa
Date posted:
April 26, 2017
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Outline methods used by Europeans to acquire colonies in Africa
Date posted:
April 26, 2017
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Explain the three main categories of Human Rights.
Date posted:
April 26, 2017