Question

please answer witb information on all questions

5. Which would have the higher vapor pressure H2 (1) or D2(1) explain the reasoning behind your choice. 6. What are the formulas of the two know chlorides of lead, why do these two compounds exist? Identify the mostly likely type of bonding to occur in each case. 7. The hydrogen bond the forms between hydrogen fluoride molecules is the strongest type hydrogen bond, so why does water have higher melting point than hydrogen fluoride. 8. The N-N bond energy is F2NNF2 is about 80kJ/mol compared to 160kJ/mol in H2NNH2 Can you provide a rational argument to explain the following. a. Why there is such a significant difference in the bond energy b. Which would have the highest melting point c. Under standard conditions would you expect them to be a solid, liquid, or a gas. 9. Why are there no silicon analogues of graphite?

Answer 1

Q5:

H₂ has lesser molecular mass than D₂ that means there are lesser intermolecular forces of attraction among H₂ molecules . Hence H₂(l) will have higher vapor pressure .

Q6 :

PbCl₂ and PbCl₄ are two chloride of lead .

Group 14 elements show oxidation state of +2 and +4 compounds . PbCl₂ would be predominantly ionic in nature but PbCl₄ would be covalent in nature . Because as the oxidation state of metal increases it's polarizing power increases and there is development of covalent nature in ionic compounds .

Q7:

H-F forms stronger hydrogen bonding than water due to more Delta positive charge on hydrogen because of higher electronegativity difference between H and F .

But there are two lone pairs on oxygen atom and two hydrogen atoms present in water molecule . Water molecule has 2 hydrogen donor atoms and 2 hydrogen acceptor atoms . Water molecule forms 4 hydrogen bonds and well packed crystal structure . Hence higher melting point than HF .

HF has zig zag chain like structure which is less efficiently packed than ice crystals .