11. Conservation of Mass,       Charge, and Energy   Previous PageNext Page

12.1What are the oxidation numbers of the different types of atoms in potassium permanganate, KMnO4? In manganese dioxide, MnO2? In manganous sulphate, MnSO4? Is the manganese oxidised or reduced, in going from manganese dioxide to potassium permanganate?1

13.1What are the oxidation numbers of the metal atoms in potassium chromate, K2CrO4? In potassium dichromate, K2Cr2O7? In chromous chloride, CrCl2? Is the chromium atom oxidised, or reduced, in going from dichromate to chromous chloride?1

14. What is the difference between the oxidation number method and the half-reaction method for balancing oxidation-reduction equations?

15. What three quantities must be accounted for in successfully balancing an oxidation-reduction equation? Which quantity is balanced last when using the half-reaction method, but first when using the other method?

16. In what sense do the principles of conservation of mass and conservation of energy fail when we turn from chemical to nuclear reactions? Why? What new conservation principle can be used instead?

17. How do the energies involved in a typical chemical reaction and a typical nuclear reaction compare?

  Page 3 of 5 HomeGlossary