here i m again..i juz realised how late it is already..searching for some chem stuff..cos these questions have been in me and in my lecture notes for longer than a year already n i only have myself to depend on to solve them cos erm..how do i say it..my chem teacher is quite..err u noe..impatient..
nvm..so what i wan to say is i found it finally!on this page..it's about melting point of straight vs branched alkanes..cos my sch notes got some discrepancy and so i wanted to noe..anyway the conclusion is tt:
1)boiling point of branched alkanes are lower than straight alkanes cos need less energy to break the intermolecular forces since got less surface area in contact to form the temporary dipole-induced dipole attractions.
2)for melting point it's not straightforward cos u need to take into account of the shape of the molecule as well..if it packs better into a solid,it requires more energy to break and so higher melting point.
anyway want to say tt 苏打绿's 无与伦比的美丽 is very nice..and the other songs in jay's new album are also not bad..the songs season is here again!
listening to: 无双 by 周杰伦
No comments:
Post a Comment