SCH 3U – Molecule Polarity/Shape Assignment /65
For each of the following pairs of molecules, determine which is has the highest melting point AND which one will dissolve in water better and explain your reason(s) for making these choices: to determine the above you will have to: i) make a 2D Lewis dot structural diagram, ii) a 3D VSEPR structural diagram, iii) calculate the ∆EN for the intramolecular bond(s), iv) label the polarities of each bond (if polar covalent), v) put in the bond angle(s) on the 3-D diagram, vi) indicate on the VSEPR diagram the overall polarity of the molecule by using as a net vector arrow (if a polar molecule), vii) give the name of the shape of the molecule and viii) state the intermolecular force for each molecule in the solid state.
1) methanol (CH3OH) AND sulfur dichloride
i) i)
ii) ii)
iii) iii)
vii) vii)
viii) viii)
WHICH COMPOUND HAS THE HIGHER MELTING POINT/SOLUBILITY IN WATER?
2) nitrogen trichloride AND oxygen difluoride
i) i)
ii) ii)
iii) iii)
vii) vii)
viii) viii)
WHICH COMPOUND HAS THE HIGHER MELTING POINT/SOLUBILITY IN WATER?
3) boron triiodide AND ammonia (NH3)
i) i)
ii) ii)
iii) iii)
vii) vii)
viii) viii)
WHICH COMPOUND HAS THE HIGHER MELTING POINT/SOLUBILITY IN WATER?
4) nitrogen gas AND phosphorus
trichloride
i) i)
ii) ii)
iii) iii)
vii) vii)
viii) viii)
WHICH COMPOUND HAS THE HIGHER MELTING POINT/SOLUBILITY IN WATER?
5) carbon dioxide AND carbon disulfide
i) i)
ii) ii)
iii) iii)
vii) vii)
viii) viii)
WHICH COMPOUND HAS THE HIGHER MELTING POINT/SOLUBILITY IN WATER?
6) methane AND CH2F2 (difluoromethane)
i) i)
ii) ii)
iii) iii)
vii) vii)
viii) viii)
WHICH COMPOUND HAS THE HIGHER MELTING POINT/SOLUBILITY IN WATER?
7) silicon tetrabromide AND HCN (hydrogen cyanide)
i) i)
ii) ii)
iii) iii)
vii) vii)
viii) viii)
WHICH COMPOUND HAS THE HIGHER MELTING POINT/SOLUBILITY IN WATER?
8) nitrogen trifluoride AND phosphorus tribromide
i) i)
ii) ii)
iii) iii)
vii) vii)
viii) viii)
WHICH COMPOUND HAS THE HIGHER MELTING POINT/SOLUBILITY IN WATER?