Kinetics/equilibrium Review Worksheet With Answers - Regents Chemistry Mr. Woods Page 3
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6Kinetics/Equilibrium Review
Base your answers to questions 16 and 17 on
the information below.
At standard pressure, hydrogen peroxide, H
O
, melts at –0.4°C, boils at 151°C, and is very soluble
2
2
in water. A bottle of aqueous hydrogen peroxide, H
O
(aq), purchased from a pharmacy has a
2
2
pressure-releasing cap. Aqueous hydrogen peroxide decomposes at room temperature, as represented by
the balanced equation below.
2H
O
(aq)
2H
O( ) + O
(g) + 196.0 kJ
2
2
2
2
16. Explain why a hydrogen peroxide bottle needs a pressure-releasing cap.
17. State evidence that indicates the decomposition of H
O
(aq) is exothermic.
2
2
Base your answers to questions 18 and 19 on the information below.
Several steps are involved in the industrial production of sulfuric acid. One step
involves the oxidation of sulfur dioxide gas to form sulfur trioxide gas. A catalyst is used to
increase the rate of production of sulfur trioxide gas. In a rigid cylinder with a movable
piston, this reaction reaches equilibrium, as represented by the equation below.
(g) « 2SO
2SO
(g) + O
(g) + 392 kJ
2
2
3
18. State, in terms of the concentration of SO
(g), what occurs when more O
(g) is added to the reaction at
3
2
equilibrium.
19. Explain, in terms of collision theory, why increasing the pressure of the gases in the cylinder increases the
rate of the forward reaction.
Regents Chemistry
Mr. Woods
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