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Unformatted text preview: II III IV Mix/”7421 I l /UZ'\,')L?'W’ / rill/0W1}; ZﬂJEKQm Mixing SbCl3 and GaCl3 in a one-to-one molar ratio (using liquid sulfur dioxide as a solvent) gives a solid ionic compound of empirical formula GaSbCls. A controversy arises over whether this
compound is (SbClz+)(GaCl4‘) or (GaClz+)(SbCl‘4). (a)
(b) (a) (b) Predict the molecular structures of two anions.
it is learned that the cation in the compound has a bent structure. Based on this fact, which
formulation is more likely to be correct? The molecules of a certain compound contain one atom each of nitrogen, ﬂuorine and
oxygen. Two possible structures are NOF (O as central atom) and ONF (N as central atom).
Does the information that the molecule is bent limit the choice to one of these two
possibilities? Explain. Predict the structure of the NNO molecule which has a small dipole moment. Which end of
the molecule is more likely to be the positiVe end based only on electronegativity? Knowing that carbon has a valence of four in nearly all its compounds and can form chains and rings of c atoms, (a) Draw three possible structures for C3H4 (there'are three structural isomers) (b) Determine all bond angles 111 each structure. ' (c) Determine the hybridization of each carbon atom in the structures. (d) Ascertain whether the three structures are resonance structures and explain your reasoning. 1. For the four spectral regions (radiowaves, microwaves, infrared, and visible UV), give the
types of energy level transition resulting from the absorption of radiation in each region. 2. What information about chemical structure and/or bonding is obtained from each of the spectra regions 3. Give Beer’s Law and identify all terms. 4. Sodium Metal dissolves 1n liquid ammonia without reaction to form a blue solution. At 100
nm, the molar extinction coefﬁcient 15 1.0x} 04cm lM'. Using a cuvette (sample cell) with
a 0.10 mm path length, the absorbency was 0.320. Calculate the cencentration of the
dissolved sodium. 5. What is a coordinate covalent bond? In what type of reaction does a coordinate covalent
bond usually result? 6. When is Roman spectroscopy useful in examining the vibrations of certain molecules. 7. What are selection rules? 8. How is molecular orbital theory used to assign transitions observed in the ultraviolet region? 9. What is meant by the term “absorption spectrum”? 10. A 1.00 g sample of steel is dissolved in acid and diluted to 1.00 L. The solution is then treated so that the manganese is quantitatively converted to MnO4'. The resulting solution in a 1.00 cm cell has an absorbency of 0.720 at 525 nm. The molar extinction coefﬁcient for
the MnO4' is 2.45x103cm‘1mol“ L at 525 nm. I; _ 5.6.Q/4 3.45 _I. _(a) _QQGQ. ﬂit—*JQL _g_':__— .6 ’_'"__vt5¢/W — 53—? ‘61’ a‘a’ ~ .10 A= 89,9, ___. _.________ _._ _.7_ _Q_ ZQQ _3é71/J7U03 ~94me Q) a (Mom)- ,. ___”; _____ c___72'¢3¢X/(f$z- mu/ T_———W (a? ‘?4K10“"9(5\/; 7‘71 7 hiw.oo\__ Wlln M..,."n :DQ’rc/wo'7zzma/m/w.‘ (/0)?- Q. ...
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- Fall '07