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CHM1011 - Chemistry I - S1 2025
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When a positive catalyst is used in a reaction which of the statements below describes the situation which occurs?
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The rate constant for a certain chemical reaction is 0.00250 L mol-1 s-1 at 25.0 °C and 0.0125 L mol-1 s-1 at 50.0 °C. What is the activation energy for the reaction, expressed in kilojoules?
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For a one step reaction, the activation energy for the forward reaction is 40.0 kJ mol-1, and the enthalpy of reaction is -20.0 kJ mol-1. Calculate the activation energy for the reverse reaction.
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The acid dissociation constant, Ka, for the weak acid, lactic acid is Ka = 1.38 x 10-4. The conjugate base is lactate.
Calculate the final pH when 0.16 M lactic acid is dissolved in water. (Note, you can assume "x" is not significant with respect to the acid concentration where x is the change in concentration upon equilibration.)
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