Rank the following compounds from strongest base (top) to weakest base (bottom). a. Aniline
b. Ammonia
c. Diethylamine
d. Urea

Polyethylene is a strong synthetic polymer that can be used to make toys and bottles. this makes plastics which are important also to people but sometimes it lead to harmful environmental effects such as global warming if these plastics are burned.

Melting increases as mass increases. since alkanes are not branched molecular structures, the one with the heavier mass will have higher melting point.  octane's mp > butane's mp