The boiling point of methanol is much higher than that of ethane. this is primarily due to a the significant molecular size difference between methanol and ethane b the carbon oxygen double bond in the methanol c the difference in molar masses of methanol and ethane d the hydrogen bonding in methano

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.