Give the latest technology on the harvesting of natural gas, petroleum and solar power. (5) 2.2 Give the 3 differences between a boiling water nuclear reactor and a pressurized nuclear water reactor. (6) 2.3 Draw a simple circuit and give brief explanation on how to harvest energy from a acid/bases system. (5) 2.4 Give three fundamental functions of a salt bridge in an electrochemical cell. (3) 2.5 Give an ideal principle of predicting a performance of a fuel cell and give an example with a calculation. (6)