Increased fuel efficiency in automobiles is beneficial from both an economic and an environmental perspective. Besides the fuel economy rating (L/100 km), what other properties or factors are involved in evaluating automobile fuels from both an economic and an environmental perspective? 13 5) Classify the following reactions as synthesis, decomposition, or com bustion. Predict the products of the reactions, using balanced chemical equations. (a) Al(s)+F2(g) (b) KCl(s) (c) S8(g)+O2(g) (d) methane + oxygen (e) aluminum oxide (f) Hg(1)+O2(g) (g) iron(III) bromide