Answer Happy

Question 6 a) Figure 4 shows a graph of rate vs. concentration of D for a particular reaction. 4.50E-02 4.00E-02 3.50E-02 3.00E-02 2.50E-02 Rate/mol dm3 51 2.00E-02 1.50E-02 1.00E-02 5.00E-03 0.00E+00 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 [D]/mol dm3 Figure 4 i) State whether this reaction is zero, first, or second order with respect to D. Explain how you have come to this conclusion. (2 marks) ii) Calculate the rate constant for this reaction from the graph shown. Show full details of your working and include units. (2 marks) b) Figure 5 shows a Maxwell-Boltzmann distribution of molecular energies in a gaseous reaction mixture at 500 K. 10 Number of molecules Emp E Energy Figure 5 i) Describe how the values of Emp and Ea would change, if at all, for this mixture if the temperature was increased. (2 marks) ii) Describe how the values of Emp and Ea would change, if at all, for this mixture if the concentration was increased. (2 marks) iii) Explain why a small increase in temperature leads to a large change in the rate of reaction. (1 mark) iv) Explain how a catalyst increases the rate of reaction. (1 mark)