Why does the rate of reaction increase as the temperature increase? Activation e

Question

Why does the rate of reaction increase as the temperature increase? Activation energy decreases. Activation energy increases The rate constant decreases The rate constant increases. For a particular reaction, the rate constant doubles when the temperature is raised from 300 K to 310 K. What is the activation energy (in kJ middot mol^-1)? 0.0597 kJ mol^-1 0.155 kJ middot mol^-1 53.6 kJ mol^-1 155 kJ middot mol^-1 For a certain reaction, the mechanism has been proposed. A(g) + B(g) X(g) [fast] X(g) + C(g) rightarrow Y(g) [slow] Y(g) rightarrow D(g) [fast] Which statement is correct? The first step in the mechanism is bimolecular. The overall reaction is A(g) + B(g) X(g) rightarrow D(g) The third Step in the mechanism is rate-determining. Only one intermediate is involved in the mechanism. If hydrogen iodide is placed into an otherwise empty, sealed container, what would one expert to find after the system has attained equilibrium? 2H1(g) H_2(g) + I_2(g) K_p = 2.0 times 10^-3 only H1 equal amounts of H1, H2 and I_2 mostly H_2 and I_2 with a small amount of H_1 mostly H_1 with small amounts of H_2 and l_2 If nitrogen gas were added to this system at equilibrium. how does the concentration of hydrogen gas change as equilibrium is reestablished? N_2(g) + 3H_2(g) 2NH_3(g) K = 1.64 times 10^4 at 400 degree C increases decreases stay the same impossible to predict with the given information What is the solubility product expression for Ag_3PO_4? K_sp = [Ag^+][PO_4^3-] K_sp = [Ag^+] [PO_4^3-]^3 K_sp = [Ag^+]^3 [PO_4^3-] K_sp = 3 [Ag^+][PO_4^3+] Which pair forms a buffer solution? HBr and KBr CsOH and CsNO_3 H_2SO_4 and NaHSO_4 CH_3NH_2 and CH_3NH_3Cl What is the minimum molar concentration of Ni^2+ required to begin precipitation of Ni(OH)_2 from a solution with a pH of 9.50? 8.7 times 10^-12 M 1.4 times 10^-7 M 5.5 times 10^-7 M 5.2 times 10^-6 M The titration curve is for a strong acid with strong base. strong acid with weak base weak acid with strong base. weak acid with weak base. Changing the pH from 1.0 to 2.0 means [H^+] halves doubles. increases by a factor of 10. decreases by a factor of 10. What is the oxidation number of Mo in MoO_4^2-? +10 +8 +6 +4

Explanation / Answer

The rate of the reaction increases the temperature because the rate constant increases. Option D is the right answer.

Activation energy for a given reaction is fixed. So when you increase the temperature the number of molecules attaining this mininum energy to cross the barrier increases thereby increasing the rate of the reaction. So there is no change in the activation energy with tempearture.

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