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Some Chemistry Questions.?
1) If a compound has more electrons, does it mean it will have a higher melting point?
2) If a compound has a higher melting point, does it mean it will be more soluble in water? (e.g. CH4 vs OF2)
3) How do you calculate the electronegativity of a compound? For example, I know HN would be 2.6-2.2= .4. But what about H2O or HCN.
Thanks in advance!
1 Answer
- GroverLv 710 years agoFavorite Answer
1) generally yes, because it increases the dispersion force type intermolecular attractions between the particles.
2) It could. There are a number of reasons why one compound could have a higher melting point compared to another. If it is due to greater polarity (dipole moment) then it may be more soluble in water since water is polar.
3) Electronegativity is not calculated for a compound.
It is calculated for an element using a variety of methods, such as averaging the ionization energy and the electron affinity.
What you seem to reference however is calculating the electronegativity difference between two elements that form a bond. This is useful for determining whether a bond is ionic, covalent, or polar covalent. Basically, just subtract the electronegativity values for the two elements that form the bond.
Ignore any subscripts.
H2O => H-O bond 3.5-2.2, = 1.3 = polar covalent.
HCN => H-C bond = 2.5 - 2.2 = 0.3 and C-N triple bond = 3.0-2.5 = 0.5 which are both in the covalent range.
