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(a) Distinguish between exothermic and endothermic reaction.
(b) Changes of state are either exothermic or endothermic. Name a change of state that is:
(i)Endothermic
(ii) Exothermic
(c ) When pure water is heated at 1 atmospheric pressure at sea level, the temperature of the water does not rise beyond #100^oC#,even with continued heating. Explain this observation.
(d)Study the energy cycle diagram below and answer the questions that follow:
(i) What does #Delta#H1 represent?
(ii) Show the relationship between #Delta#H1, #Delta#H2 and #Delta#H3.
(e)Butane and propane are constituents of cooking gas. Which one produces more energy per mole on combustion? Explain.