ha! jawab, jawab....(4.1)

1.

Which one of the following reactions would you expect to be fastest at room temperature and why?

	Solution:
Pb2+(aq) + 2 Cl-(aq) →PbCl2 (s)	fastest - ions in aqueous solution react very quickly; all are in the same phase
Pb(s) + Cl2 (g) → PbCl2 (s)	slower - one of the reactants is a solid

 

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2.

Consider the following reactions. Which do you predict will occur most rapidly at room conditions? Slowest?

	Solution:
C2H6 (g) + O2 (g) → 2 CO2 (g) + 3 H2O(g)	slow due to covalent bonding (unless the reaction is highly exothermic)
Fe(s) + O2 (g) → Fe2O3 (s)	slowest - solid reactant (Fe); this reaction describes the rusting of iron
H2O(l) + CO2 (g) → H2CO3 (g)	slow due to covalent bonding
2 Fe3+(aq) + Sn2+(aq) → 2 Fe2+(aq) + Sn4+(aq)	fastest - ions in solution react very quickly