10. Which of the following statement(s) is/are true? (A)When two opposing processes are proceeding at identical rates, the system is at equilibrium. (B)Catalysts are an effective means of changing the position of an equilibrium. (C)An endothermic reaction shifts toward products when heat is added to the reaction. (D)For an endothermic reaction, increasing temperature not only increases the forward reaction rate but also decreases the reverse reaction rate. (E)None of the above statements is true.

4. Consider the following gas samples: (A)The volume of sample A is twice the volume of sample B. (B)The mean square velocity of molecules in sample A is twice as large as the mean square velocity of molecules in sample B. (C)The fraction of molecules in sample A, having a kinetic energy greater than some high fixed value, is larger than the fraction of molecules in sample B, having kinetic energies greater than that same high fixed value. (D)Assuming identical intermolecular forces in the two samples, sample A should be more nearly ideal than sample B. (E)The average kinetic energy of the molecules in sample A is twice the average kinetic energy of the molecules in sample B.

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