bonus exam final 2

bonus exam final 2 - FORM #4 Chem 1202 Final Exam Spring...

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FORM #4 ————————————————————————————————————— Chem 1202 Final Exam Spring 2004 ————————————————————————————————————— 1 Which of these statements is NOT TRUE according to the theory of how chemical reactions take place. (Molecular collision theory) ( A ) A catalyst provides an alternative pathway for reaction. ( B ) Reactants must have an energy less than E a in order for reaction to occur. ( C ) Reactants must collide in a certain orientation in order for reaction to occur. ( D ) In most reactions only a small fraction of collisions between reactants will create products. ( E ) Increasing temperature increases the number of reactants with enough energy to react. 2 Given the reaction 2O 3 (g) 3O 2 (g) Δ H 284.6 kJ Calculate the number of moles of O 3 required to produce 6. 589 10 2 kJ of heat. ( A ) 2. 315 mol ( B ) 1. 158 mol ( C ) 1. 543 mol ( D ) 6. 946 mol ( E )4 .63mol 3 What is the change in temperature of 58.0 g of water at 25 o C if 2. 375 10 3 J of heat are added? The specific heat of water is C s 4.18 J/g o C. ( A ) 40. 95 o C ( B ) 11. 07 o C ( C ) 5. 682 10 2 o C ( D ) 9. 796 o C ( E ) 9. 796 o C 4 0.75 M bromine and 0.75 M chlorine are introduced into a container with no BrC present. The reaction is allowed to achieve equilibrium. What is the equilibrium concentration of BrC ? The equilibrium constant, K c 7.0
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Br 2 g C 2 g 2BrC g ( A ) 0.8542 M ( B )2 .26M ( C ) 0.5443 M ( D ) 0.4271 M ( E ) 1. 089 M 5 Plutonium has an isotope that undergoes radioactive decay. The reaction follows first order kinetics with a rate constant of 9. 118 10 13 s 1 . How many seconds does it take for a sample of 1000 radioactive plutonium atoms to decay to 660 atoms? Pu U ( A ) 4. 322 10 11 s ( B ) 3. 155 10 11 s ( C ) 3. 691 10 11 s ( D ) 2. 366 10 9 s ( E ) 2. 209 10 10 s 6 Which of the following statements is true for the reaction 2Na s C 2 g 2NaC s Δ H rxn o 821.8 kJ/mol ( A ) The reaction is endothermic ( B ) The reaction heats up the surroundings ( C ) Δ H rxn o 821.8 kJ for the reaction 2NaC s 2Na s C 2 g ( D ) The reaction absorbs heat ( E ) Δ H rxn o  410.9 kJ for the reaction Na s 1 2 C 2 g NaC s 7 This exothermic reaction contains a mixture of reactants and products that is at equilibrium. Which of these choices will cause the reaction to spontaneously begin making products? NH 4 2 CO 3 s 2NH 3 g CO 2 g H 2 O g ( A ) Adding some NH 3 g ( B ) Adding some more solid ammonium carbonate ( C ) Increasing the volume ( D ) Raising the temperature by heating ( E ) Adding a catalyst
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8 An aqueous solution of calcium hydroxide has a pH 10. 4 . What is the concentration of Ca(OH) 2 ?
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bonus exam final 2 - FORM #4 Chem 1202 Final Exam Spring...

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