2, 4, 7 , 9 Conparing the Phyaleal Propezties of Various Related Subatances UNSU

Question

2, 4, 7 , 9 Conparing the Phyaleal Propezties of Various Related Subatances UNSUBSTITUTED 183 150 7 CH,C1 Whys larger than MP Why do larger methyl tel-and tetrahalogens have higher melting points? Why is methylbromide MP lover than that of nethylchloride? the her group n tetrahydrides e inerease vith increasing moiar ase 4Whyis dichloromethane MP lover than that of dlfluoronethane7 Substituted net hylbzeides and "ied?des decrease HP with decreasing aubstitution, vey? Subatituted methy bronides and -lodides decrease MP with decreasing subatitutlom, bat substituted nethyiriuorides and-chlorides are Lrregulazi why? 6. BOILING PoI 100 Why is MP Why do t so mach higher thas MP the other dihydrides MP get higher wit h Increasing molar mass? 0MPs and MPa ace eal close: why? General Chemistry 1 Haking Sense of Physical Properties Ansver the questions Indicated by the first letter of your last nane (put the question number In the snall box) H- 12,S,9,10) s-??3,7,8,10) 7-2 (2,4-7.9

Explanation / Answer

2: The increase in molar mass means increase in number of protons,electrons,neutrons and other sub atomic particles in the atom. Theses particles are bind together by electrostatic forces. So breaking down this bonds requires extra amount of energy needed to be supplied to the system. That is why the melting point is increases with increase in the molar mass.

4: fluorine is the most electro negative element in the periodic table. Which means that it forms strong bonds. The bond dissociation energy is very high for fluorine compounds. So for melting down a fluorine compounds requires very high amount of heat energy. Chlorine is comparatively less electro negative element than fluorine. It forms week bonds than fluorine. There for it's melting point is less than fluorine.

7: Substitution in fluorine or chlorine compound results in ionization of the halides present in them.because the substituted atom may or may not be bonded to halide. In the both case the halides gets ionised. The first ionization energy of fluorine as well as chlorine is comparatively less than 2 nd ionization energy. This is because of the more stable electronic configuration of halide atoms. So the second ionization energy is somewhat greater than 1st. But the 3rd ionization energy is less than first two because of the less stable electronic configuration. This is the reason for the abnormal rise in melting point for fluorides and chlorides. For iodides and bromides no such elevation in ionization energy exists. So they shows only gradual decrease in MP with substitution.

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