Page 148 - Basic physical chemistry for the atmospheric sciences

1 3 4 Basic physical chemistry

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6. 1 3 . What are the oxidation numbers of the elements n the fol­
lowing compounds (a) NO z- (aq , (b) N0 3 (aq) (c) HN0 (aq)
)
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and (d) H 2 S03(aq)?
s
6. 1 4 . Are the following redox reaction ?
(a) 2S0 2 (g) + O (g)� 2S0 (g)
z
3
(b) 2CCliaq) + K 2 Cr0iaq)�
2Cl 2 CO(aq) + Cr0 2 Cl 2(aq) + 2KCl(aq)
6. 1 5 . Oxygen i n water can oxidize lead. Balance the following
redox reaction that represents this process:

6 1 6. B a lance the equation for the following redox reaction in an
.
aqueous solution:

6. 1 7 . The u n balanced equation fo r the chemical reaction repre­
senting respiration is

Which is the oxidant and which the reductant in this re­
action?
6. 1 8 . Arrange the following i n order of increasing strengths as
2
oxidants: Ag + (aq) , M n 2 + ( aq), 0 (aq), and Fe + ( aq).
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s
6. 1 9 . Use Table 6.2 t o determine if, under standard condition ,
2
t
(a) FeH (aq) will oxidize Ni(s) o N i + ( aq) t o any significant
extent, (b) H202(aq) will behave as an oxidant or reductant
with respect to the So - (aq) - s2 0� - (aq) couple, (c)
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H2 0(aq) will behave as an oxidant or reductant with respect
to the Ag + (aq) - Ag(s) couple, and (d) SOi - (aq) will oxidize
Fe 2 + (aq) to Fe 3 + (aq) to a significant extent?
6.20. Determine whether the following reactions proceed sponta­
neously from left to right in acidic solutions under standard
conditions. What are the values of their standard cell poten­
tials ?
+
(a) H 2 S(aq) + Clz(aq)� S ( s ) + 2c1 - ( aq) + 2H ( aq)
(b) 4Soi- ( aq) + 0 2 (g) + 4H + ( aq)� 2s2 0� - (aq) + 2H 2 0(1)
6 . 2 1 . Using the appropriate values of EJ given in Table . 2 , deter­
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mine the initial change in the Gibbs free energy under stan­
dard conditions for the redox reaction