The automobile fuel called e85 consists of 85% ethanol and 15% gasoline. e85 can be used in so-called flex-fuel vehicles (ffvs), which can use gasoline, ethanol, or a mix as fuels. assume that gasoline consists of a mixture of octanes (different isomers of c8h18), that the average heat of combustion of c8h18(l) is 5400 kj/mol, and that gasoline has an average density of 0.70 g/ml. the density of ethanol is 0.79 g/ml.

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acids are substances that ionize (break off) in an aqueous solution to produce hydrogen (h+) ions

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chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.