Question 1
A chemical reaction is most likely to be spontaneous if it is accompanied by
◦
increasing energy and increasing entropy◦
lowering energy and increasing entropy◦
increasing energy and decreasing entropy◦
lowering energy and decreasing entropy◦
None of these are correct.Question 2
A mixture of hydrogen and chlorine remains unreacted until it is exposed to ultraviolet light from a burning magnesium strip. Then the following reaction occurs very rapidly:
| | | H2(g) + Cl2(g) → 2HCl(g) | ΔG = –45.54 kJ |
| | | | ΔH = –44.12 kJ |
| | | | ΔS = –4.76 J/K |
Which of the following is consistent with this information?
◦
The reactants are thermodynamically more stable than the products.◦
The reaction has a small equilibrium constant.◦
The ultraviolet light raises the temperature of the system and makes the reaction more favorable.◦
The negative value for ΔS slows down the reaction.◦
The reaction is spontaneous, but the reactants are kinetically stable.
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