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Consider the reaction, A+BC, with the following enthalpy and entropy change for the reaction: H=+30kJ,S=+50J/K It is spontaneous at temperatures less than 600K. It is nonspontaneous at all temperatures. It is spontaneous at all temperatures. It is spontaneous at temperatures greater than 600K. it is spontaneous only at 25C. QUESTION 21 Which of the following statement is true? At any temperature, the proton concentration in pure water always corresponds to a pH value of 7.0. The Henderson-Hasselbalch equation relates the equilibrium constant to the standard free energy change. The equlibrium constant for a reaction is only constant at a particular temperature. The standard free-energy change of the reaction determines the direction of spontaneous change. Living organisms ingest low-enthalpy, high-entropy nutrients and convert them into high enthalpy, low-entropy waste products. QUESTION 22 Polymerase chain reaction is - a way DNA replicates itself in the living cell. a chain reaction mediated by polymerase to amplity DNA fragments of defined sequence. governed by the Henderson-Hasselbalch equation. DNA polymerization without a template. a reaction involving a chain of different types of polymerases acting successively on a DNA