This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
ScanSolve AI Answer
You're on a roll — Here are the answers to your questions: 7. The diagram below shows an experiment for investigating electrical conduction in lead (II) iodide. Study it and answer the questions that follow: iii) Complete the diagram by indicating the condition missing in the diagram but must be present for electrical conduction to take place. (1mk) The missing condition is heat. A Bunsen burner flame should be drawn under the boiling tube to melt the lead(II) iodide. b) Why is it necessary to leave a gap between the cork and the boiling tube? (1mk) To allow for the escape of any fumes produced (e.g., iodine vapor) and to prevent pressure build-up inside the boiling tube as the contents are heated. c) State two observations that are expected at the end of the experiment. (2mks) i) The bulb will light up*, indicating electrical conduction. ii) A grey/silvery solid (lead metal) will be deposited at the cathode*. iii) Brown/purple fumes (iodine vapor) will be produced at the anode*. d) Write the equation taking place at: Anode: 2I^-(l) I_2(g) + 2e^- Cathode: Pb^2+(l) + 2e^- Pb(s) e) Why should this experiment be carried out in a fume chamber? (1mk) Because iodine vapor produced at the anode is toxic and corrosive. f) State two applications of electrolysis. (2mks) i) Purification of metals* (e.g., copper). ii) Extraction of reactive metals from their ores* (e.g., aluminium, sodium). (Other valid answers include electroplating, anodizing, manufacture of chemicals like chlorine and sodium hydroxide). 8. (The image shows a partially drawn structure of 2-methylhexane. Here is the complete structural formula with all hydrogen atoms shown.) ` H H H H H H | | | | | | H - C - C - C - C - C - C - H | | | | | | H C H H H H | H | H ` This represents 2-methylhexane. Send me the next one 📸