timtamboy63 Posted November 20, 2010 Report Share Posted November 20, 2010 Read the title ^^I just can't work it out, should Cl have a higher melting point due to the greater electrons meaning greater van der Waals forces? Reply Link to post Share on other sites More sharing options...
Daedalus Posted November 20, 2010 Report Share Posted November 20, 2010 Sulphur exists as S8 whereas chlorine as Cl2 ... Bigger molecules mean stronger Van der Waals forces. 2 Reply Link to post Share on other sites More sharing options...
dessskris Posted November 20, 2010 Report Share Posted November 20, 2010 Are you referring to the element (as stated in the data booklet) or the molecule?Btw I thought Sulfur existed as S2 but anyways.. Reply Link to post Share on other sites More sharing options...
timtamboy63 Posted November 20, 2010 Author Report Share Posted November 20, 2010 Molecules I guess, though the question didnt say so, the answer said molecule. Reply Link to post Share on other sites More sharing options...
Daedalus Posted November 20, 2010 Report Share Posted November 20, 2010 (edited) Are you referring to the element (as stated in the data booklet) or the molecule?Btw I thought Sulfur existed as S2 but anyways..http://wiki.answers.com/Q/Why_does_sulfur_have_a_higher_melting_point_than_chlorinevolatility increase across a period and so chlorine is more volatile and therefore is more of a gas than sulphur and so it needs more energy to meltThis raises another question: why does volatility increase across a period? what's the difference between an element and its molecule? are you taking chemistry standard or higher? you don't get Fe metal at room temperature without a lattice; you can't get an element which is not bonded in some way unless it doesn't bond at all (very unlikely! unless it's a noble gas..)lol that's a ridiculous answer btw. never refer to an answer.com or yahoo answers thing especially when it's not cited.. volatility is a measure of the tendency of a substance to vaporize. vaporization is the change of state (from liquid or solid) to gas phase. melting is the change of state from solid to liquid phase. does that strike you as a little inadequate by way of explaining a chemical property ? its basically saying it has a higher melting point because it has a higher boiling point lol.Also, sulfur exists most commonly as a solid in the form S8 ... but it has apparently more allotropes than any other substance. either way if we're talking melting points then its gas allotropes, S2 and S3, are hardly relevant ... More seriously, the correct answer to this question would be: http://lmgtfy.com/?q=why+does+chlorine+have+a+lower+melting+point+than+sulfur%3F Edited November 20, 2010 by Daedalus Reply Link to post Share on other sites More sharing options...
dessskris Posted November 20, 2010 Report Share Posted November 20, 2010 Are you referring to the element (as stated in the data booklet) or the molecule?Btw I thought Sulfur existed as S2 but anyways..http://wiki.answers.com/Q/Why_does_sulfur_have_a_higher_melting_point_than_chlorinevolatility increase across a period and so chlorine is more volatile and therefore is more of a gas than sulphur and so it needs more energy to meltThis raises another question: why does volatility increase across a period? what's the difference between an element and its molecule? are you taking chemistry standard or higher? you don't get Fe metal at room temperature without a lattice; you can't get an element which is not bonded in some way unless it doesn't bond at all (very unlikely! unless it's a noble gas..)lol that's a ridiculous answer btw. never refer to an answer.com or yahoo answers thing especially when it's not cited.. volatility is a measure of the tendency of a substance to vaporize. vaporization is the change of state (from liquid or solid) to gas phase. melting is the change of state from solid to liquid phase. does that strike you as a little inadequate by way of explaining a chemical property ? its basically saying it has a higher melting point because it has a higher boiling point lol.Also, sulfur exists most commonly as a solid in the form S8 ... but it has apparently more allotropes than any other substance. either way if we're talking melting points then its gas allotropes, S2 and S3, are hardly relevant ... More seriously, the correct answer to this question would be: http://lmgtfy.com/?q=why+does+chlorine+have+a+lower+melting+point+than+sulfur%3FSo the melting point of an element is just the same with that of its molecule? oh I see now. Thanks for telling. Chem SL, with a stingy teacher :| Oh ok I deleted that. Hmm then would sulfur have different m.p. for different allotrope?I'm not reading that now.. I need to finish my chem lab reportS (reports! not only a report!) and now this chem question bothers me a lot...Any quick explanation for why the m.p. of S8 is higher than that of Cl2? Reply Link to post Share on other sites More sharing options...
timtamboy63 Posted November 20, 2010 Author Report Share Posted November 20, 2010 Because it has more electrons overall, hence larger van der Waals forces that create temporary dipoles, hence the bond is stronger and you need more heat to break the intermolecular forces. Reply Link to post Share on other sites More sharing options...
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