Short Answers PUT ANSWERS ON SCANTRON SHEET. Choose the substance in each pair w

Question

Short Answers PUT ANSWERS ON SCANTRON SHEET. Choose the substance in each pair with the higest boiling point. What factor, other than the deltaHsolution, determines whether an ionic compound will dissolve An example of the hydrophobic effect is Which solution has the LOWEST freezing point? Which solution has the HIGHEST freezing point? If 0.20 moles of Na2S are dissolved in 100 mL of water, the [Na+] is The extra intermolecular interaction responsible for the higher b.p. of water relative to H2S is

Explanation / Answer

The B.P of substances can be compared on following points:-

1) Greater the mass , more isw the B.P

2) Greater the dipole moment, more is the B.P

3) Greater the tendency to form intermolecular H-bonding, more is the B.P

4) greater the surface area of the molecule, more is the B.P

Thus, C6H14 has greater B.P than C2H6 because it has more mass and surface area .

NH3 has greater B.P than PH3 because it can form intermolecular H-bonding and thus can increase its surface area

CCl4 has greater B.P than CHCl3 because of its greater mass

Cis-isomers have greater B.P than trans-isomers because of dipole moment.Thus, compound (A)cis-difluoroethene has greater B.P.

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