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Chemistry
WAEC / WASSCE 1988
Kinetics, Energetics and Equilibrium
Equilibrium is said to be attained in reversible reaction when
A
all the reactants have been used up
B
all the products have been formed
C
there is no further change in temperature
D
the rates of the forward and backward reactions are equal
E
the rate of formation of the products decreases with time
medium Difficulty
Study Explanation
Chemistry
WAEC / WASSCE 1988
Kinetics, Energetics and Equilibrium
The reaction represented by the equation C(s) + H2O(l) → CO(s) + H 2(s) was carried out at 27oC if the enthalpy change was + 4500 J and the entropy change was + 12J, what was the free energy change? (∆G = ∆H - T∆S)
A
- 4176 J
B
+4176 J
C
- 900 J
D
+ 900 J
E
+8100 J
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 1978
Kinetics, Energetics and Equilibrium
Solution
When sodium chloride and metallic sodium are each dissolved in water
A
both processes are exothermic
B
both processes are endothermic
C
the dissolution of metallic sodium is endothermic
D
the dissolution of metallic sodium is exothermic
E
the dissolution of sodium chloride is explosive
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 1978
Kinetics, Energetics and Equilibrium
Consider the following exothermic reaction
2SO2(g) + O2(g) ↔ 2SO3(g)
If the temperature of the reaction is reduced from 800°C to 500°C, an no other change takes place, then
A
the reaction rate increases
B
concentration of SO3 decreases
C
concentration of SO3 increases
D
SO2 gas becomes unreactive
E
O3 gas becomes unreactive
medium Difficulty
Study Explanation