A) Which of the following statements is FALSE? a. Energy can be transferred betw

Question

A) Which of the following statements is FALSE? a. Energy can be transferred between a system and the surroundings b. Organisms are open systems as they can create energy from their environments c. In an open system energy, can be converted from one form into another d. Organisms are open systems as they can exchange both energy and materials with their environments B) A biochemical reaction will proceed in the direction as written (forward) if 1. AG zero 2. AG >0 3. AG 0 4. AH >0 C) The AG of a reaction: 1. will not change if the temperature of the reaction is changed 2. can be used to calculate whether a reaction is thermodynamically favorable under defined non-standard conditions 3. will change if the concentration of reactants and products are changed. 4. is not related to the equilibrium constant. D) Calculate the AG for the reaction: fructose-6-phosphate- glucose-6-phosphate (Given the equilibrium constant is 1.97 and the physiological relevant temperature is 37 C) i. 2.56 kJ/mol ii. -2.56 kJ/mol iii. 1.75 J/mol iv. 1.75 kJ/mol E) A thermodynamically unfavorable reaction can become favorable when coupled to a highly endergonic reaction i. True ii. False F) System does 435 kl of work (w), and loses 312 kJ of heat (q) to the surroundings. What is the change in internal every of the system? i. 747 kJ ii. -465 kJ iii. 747 kJ iv. 465 kJ

Explanation / Answer

SOLUTION:

(A) Statement (b) is false. Organisms are open systems as they can exchange both matter and energy.

(B) For the forward reaction G < 0. But a correct option is missing probabaly because of mistake. Option (2) and (3) are same. One of them should be G < 0

(C) Option (3) is correct answer. Go will change if reactant concentration is changed.

(D) Go = -RTlnK = 2.303 RTlogK = 2.303 X 8.314 X 310K X log 1.97

Go = - 1721J = - 1.71KJ

Hence option (4) is correct answer.

(E) False. The reaction must be highly exergonic.

(F) U = w + q

U = -435KJ - 312KJ = -747KJ

Negativ sign indicates work done by the system and heat lost by the system.

(G) Option (iv) is correct answer. G = 0

(H) OPtion (ii) is correct answer. Entropy represents the disorder.

(I) Option (iv) is corct answer, as disorder increases by the dissociation of NaCl

(J) G = H - TS

G must be negative for spontanous process. Since both H and S are positive therefore T must be high for the reaction to be spontaneous. Option (II) is correct answer.

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