info@ormalearn.com   +254721524786

Answers section



Questions 5.2

  1. What type of bond exists between lead and bromine in solid lead (II) bromide?

  2. What is the structure of lead (II) bromide? Explain.

  3. Write the formulae of lead ions and bromide ions, indicating their state symbols when molten.

  4. Which ions move to the anode and which ones move to the cathode?

  5. Explain why lead (II) bromide conducts electricity in molten state but not solid in solid state.

  6. Which of the following substances are also expected to conduct electricity in molten state but not as solids: H2O, NaCl, CS2, CuO, NH3, SiO2, Al2O3, PbI2?




Answers to Questions 5.2

  1. Ionic bond
  2. Giant ionic structure. Ionic bonds lead to structures that extend in all directions.
  3. Pb2+(l) and Br-(l) OR Pb2+(l) and 2Br-(l)
  4. Bromide ions (Br-) move to the anode; lead (II) ions (Pb2+) move to the cathode.
  5. In molten state, the positive lead (II) ions are separated from the negative bromide ions (ionic bonds broken); so they move about freely. In solid state, the ions are held together by strong ionic bonds; so they are not free to move about.
  6. NaCl, CuO, Al2O3, PbI2