Chapter 9: Q9.87CP (page 376)
Which of the bonds in the Problem 9.85 is the least polar?
The Si-F bond is least polar bond.
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Using the periodic table only, arrange the elements in each set-in order of decreasing EN:
(a) N, P, Si;
(b) Ca, Ga, As.
By using photons of specific wavelengths, chemists can dissociate gaseous Hi to produce H atoms at certain speeds. When HI dissociates, the H atoms move away rapidly. Whereas the heavier I atoms move away more slowly.
Geologists have a rule of thumb: when molten rock cools and solidifies, crystals of compounds with the smallest lattice energies appear at the bottom of the mass. Suggest a reason for this.
Even though so much energy is required to form a metal cation with a 2+ charge, the alkaline earth metals form halides with general formula
, rather than MX.
(a) Use the following data to calculate the of MgCl:
Mg(s) Mg(g) = 148 kJ
(g) 2Cl(g) -243 kJ
Mg(g) (g) + e- =738 kJ
Cl(g) + (g) = -349 kJ
of MgCl = 783.5 kJ/mol.
(b) Is MgCl favoured energetically relative to Mg and ? Explain.
(c) Use Hess’s law to calculate ∆H° for the conversion of MgCl to and Mg ( of = -641.6 kJ/mol).
(d) Is MgCl favoured energetically relative to ? Explain.
carbon- carbon bonds form the “backbone” of nearly every organic and biological molecule. The average bond energy of the C-C bond is 347kJ/mol. Calculate the frequency and wavelength of the least energetic photon that can break an average C-C bond. In what region of the electromagnetic spectrum is this radiation?
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