Arrive at the Lewis structure of XeF4 using the steps given in Unit 3.
Although xenon is a noble gas, it forms a number of compounds. In XeF4, after using eight valence electrons to form the four Xe—F bonds and placing three lone pairs around each fluorine atom so they reach an octet, four electrons remain. Place
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Calculate the number of normal modes of vibration for the following compounds:
- H2O
- CH4
- HBr
Determine the wavelength for a transition from the v = 0 to the v = 1 level. Is this transition in the IR region of the electromagnetic spectrum?
From the infrared spectrum given below, identify the possible functional groups corresponding to the peaks indicated in the arrows.
Explain the reason for the variation of the first ionization energies of the third period elements.
Calculate the lattice energy (in Units kJ mol-1) for ZnO crystal using Eq. 3.4 based on electrostatic model and using a Born-Haber cycle. Compare the two answers and comment on any difference.
Useful data:
Medelung constant (A) = 1.6411
Born Constant (n) = 8
Internuclear distance (a) = 199 pm
Zn(s) + ½ O2(g) → ZnO(s) ∆Hf = - 350.5 kJ mol-1
Zn(s) → Zn(g) ∆HS = 130.4 kJ mol-1
Zn(g) → Zn+(g) I(Zn) = 906.3 kJ mol-1
Zn+(s) → Zn2+(g) I(Zn+) = 1733 kJ mol-1
½ O2(g) → O(g) ½ ∆Hd = 248.5 kJ mol-1
O(g) → O- (g) EA(O) = 141 kJ mol-1
O-(g) → O2-(g) EA(O-) = - 780 kJ mol-1
Write the values of four quantum numbers for 3d electrons.
Using suitable examples define gerade and ungerade orbitals.