At higher temperature activation energy of the

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At higher temperature... @) activation energy of the reaction is lower. b. reactant concentrations are larger. c. some molecules will act as catalysts. d. more molecule collide with each other with enough energy. 23. A catalyst can speed up chemical reactions because ... a. it can increase concentrations ofreactants. ,t\. it lowers the activation energy of the reaction path. \ _-J c. it somehow can increase the temperature of the system. d. it can change the equilibrium constant of the reaction. 24.The rate constant of a first-order decomposition reaction is 0.015 s-l. If the initial concentration of reactant is 0.178 M, what is the concentration of reactant after 1 minute? a. 0.100 M $ s.eo x 1o-2M d. 55.33 seconds.
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\ Qerura[an[fl.na$tica[f,fementdry Qfiembtry II, qaff2012 Instructor'\il. Song \ 25. Which of the following factors are likely to affect the rate of a chemical reaction? i. the presence of a catalyst ii. the temperature of the reaction system iii. the concentration of the reactants a. i only $. i, ii, and iii c. ii and iii d' ii only 27.For a certain reaction, the activation energy is 52.1 kJ/mole. The reaction is carried out at 300 K and 500 K. At 300 K, the rate constant of the reaction . . .. a. is the same as the rate constant at 500 K. b. drops to -2o/o of the rate constant at 500 K. $ is about 200 times the rate constant at 500 K. d. drops to -0.02o/o of the rate constant at 500 K. 28. Identifu the intermediate in the following mechanism. Nzo(e) + No(e) -+ Nz(e) + NOz(e) NOz(e) -+ NO(g) + % Oz(e) a. NO2 29. Identify the catalyst a. NzO G*o c.N2O in the above mechanism (question 28). A No, \, d. Oz c. NO d. oz 30. Two allotropes of element carbon, graphite and diamond, have different energies. Graphite is said to be more stable because it has lower energy. However one should never woffy about diamond tuming into graphite. Which of the following energy diagram is likely to represent this process? rxn -) t bo !.- OJ c o) t bo l- q) c 0) t b! L OJ C OJ rxn -) rxn -) a. rxn -)
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