True or false? (a) The half-life is independent of initial concentration only for first-order reactions. (b) The units of a first-order rate constant are s−1. (c) Changing the temperature changes the rate constant. (d) Elementary reactions with molec-ularity greater than 3 generally don’t occur. (e) For a homogeneous reaction, J = dξ/dt, where J is the conversion rate and ξ is the extent of reaction. (f) Kc = kf/kb for every reaction in an ideal system. (g) If the partial orders differ from the coefficients in the balanced reaction, the reaction must be composite. (h) If the partial orders are equal to the corresponding coefficients in the balanced reaction, the reaction must be simple. (i) For an elementary reaction, the partial orders are determined by the reaction stoichiometry. (j) For a reaction with Ea > 0, the greater the activation energy, the more rapidly the rate constant increases with temperature. (k) The presence of a homogeneous catalyst cannot change the equilibrium composition of a system. (l) Since the concentrations of reactants decrease with time, the rate r of a reaction always decreases as time increases. (m) Knowledge of the rate law of a reaction allows us to decide unambiguously what the mechanism is. (n) Activation energies are never negative.
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