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Chemistry: Effect of an Electric Current on Substances questions and answers

Form 2 Chemistry: Effect of an Electric Current on Substances questions and answers

Lessons (10)

• 1.    Study the set –up below and answer questions that follow. State and explain the observations that would be made when the circuit is completed.
  1m 56s

• 2.    In an experiment to investigate the conductivity of substances, a student used the set-up below. The student noted that the bulb did not light. (a) What had been omitted in the set-up? (b) Explain why the bulb lights when the omission is corrected.
  1m 17s

• 3.    Explain why the following substances conduct an electric current. (a) Magnesium metal (b) Molten magnesium chloride
  0m 36s

• 4.    Bottles of sodium carbonate, sodium chloride and sugarhave lost their labels. A student prepares and tests an aqueous solution of a sample from each bottle. The results obtained are as shown in the table below. Complete the table by filling the correct label for each bottle.
  1m 58s

• 5.    Charcoal is a fuel that is commonly used in cooking. When it burns it forms two oxides. (a) Name the two oxides (b) State one use of the two oxides
  0m 40s

• 6.    A student investigated the effect of an electric current by passing it through some substances. The student used inert electrodes and connected a bulb to the circuit. The table below shows the substances used and their states. (a) In which experiments did the bulb not light? (b) Explain your answer in (a) above.
  1m 51s

• 7.    Explain how conduction of electricity takes place in the following: (a) Iron metal (b) Molten lead (II) iodide.
  0m 24s

• 8.    An electric current was passed through several substances and the results obtained recorded in the table below. Which of these substances is likely to be: (a) Magnesium (b) Hexane (c) Lead (II) bromide
  1m 38s

• 9.    (a) What is an inert electrode? (b) State the products formed when brine is electrolysed using inert electrodes. Anode: Cathode:
  1m 27s

• 10.    Draw in the space provided a labelled diagram of the set-up of the apparatus that can be used to electrolyse molten lead(II) bromide.
  2m 3s