For which reaction order is the half life independent of the initial

# For which reaction order is the half life independent

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26. For which reaction order is the half-life independent of the initial concentration? I first order II second order (A) I only (B) II only (C) both I and II (D) neither I nor II 27. What is the activation energy for the reverse of this reaction? N2O4(g) ---> 2NO2(g) Data for the given reaction is: H = + 54.0 kJ and Ea= +57.2 kJ. 28. How does an increase in temperature affect the rates of the foward and reverse reactions for an exothermic reaction? rate of foward reaction rate of reverse reaction 29. The reaction between chloroform, CHCl3(g), and chlorine, Cl2(g), to form CCl4(g) and HCl(g) is believed to occur by this series of steps. Step 1Cl2---> Cl(g) + Cl(g) Step 2CHCl3(g) + Cl(g) ---> CCl3(g) + HCl(g) Step 3CCl3(g) + Cl(g) ---> CCl4(g)
If this reaction is first order in CHCl3and half order in Cl2, which statement about the relative rates of step 1, 2, and 3 is correct? 30. This reaction occurs readily above 500 °C. 2HgO(s) ---> 2Hg(l) + O2(g) What is the equilibrium for this reaction? (A) K = [Hg]2[O2] / [HgO]2(B) K = [Hg][O2] / [HgO] (C) K = [Hg]2[O2] (D) K = [O2] 31. Consider this equilibrium, for which H < 0. HgO(s) + 4I¯(aq) + H2O(l) <===> HgI42¯ + 2OH¯ Which changes will increase the equilbrium concentration of HgI42¯? I Increasing the mass of HgO(s) present II Increasing [I¯] III Adding 1 M HCI 32. The equilibrium constant for this reaction is approximately 10¯3. HPO42¯(aq) + HCO3¯(aq) <===> H2PO4¯(aq) + CO32¯(aq) Which is the strongest conjugate base in this reaction? 33. A weak acid, HX, has Ka= 9.0 x 10¯6. Within which range does the percent dissociation for a 0.01 M HX solution lie?
34. Which salt dissolves in water to produce a solution with a pH < 7? (A) NaC2H3O2(B) Ba(NO3)2(C) AlCl3(D) KClO435. Which mixture forms a buffer when dissolved in 1.0 L of water?

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