Thermodynamics and Free Energy MCQs : This section focuses on the "Thermodynamics and Free Energy". These Multiple Choice Questions (MCQs) should be practiced to improve the Thermodynamics and Free Energy skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
Reactions that have positive standard free energy changes (ΔGo> 0) can be made to occur in cells by
A. coupling them with exergonic reactions via a common intermediate
B. manipulating the concentrations of products and reactants such that G/<0
C. coupling them to the hydrolysis of ATP
D. all of the above
Question 2
The unfolding of regular secondary structure causes
A. little increase in the entropy of protein
B. large decrease in the entropy of the protein
C. no change in the entropy of the protein
D. large increase in the entropy of the protein
Question 3
During the unfolding reaction of a helix, breakage of each hydrogen bond requires about 2kJ/mol. This implies hydrogen bonds are
A. much stronger in proteins than in water
B. not reformed with water
C. slightly weaker in proteins than in water
D. slightly stronger in proteins than in water
Question 4
If the Standard Gibb's free energy, ΔG°, for a reaction is positive then
A. the products will be favored
B. the reactants will be favored
C. the concentration of the reactants and products will be equal
D. all of the reactant will be converted to product
Question 5
The Standard Gibb's free energy, ΔG°, is
A. the residual energy present in the reactants at equilibrium
B. the residual energy present in the products at equilibrium
C. the difference in the residual energy of reactants and products at equilibrium
D. the energy required to convert one mole of reactants to one mole of products
Question 6
If the enthalpy change for a reaction is zero, ΔG° is equal to
A. TΔS°
B. #NAME?
C. #NAME?
D. lnKeq
Question 7
The thermodynamic free energy is a concept useful in the thermodynamics of chemical or thermal processes in engineering and science.
A. TRUE
B. FALSE
Question 8
The free energy is a thermodynamic state function, like the internal energy, enthalpy, and entropy.
A. TRUE
B. FALSE
Question 9
Free energy is that portion of any first-law energy that is available to perform thermodynamic work at constant temperature.
A. Yes
B. No
Question 10
The Gibbs free energy is given by G = H − TS, where H is the enthalpy, T is the absolute temperature, and S is the entropy.
A. Yes
B. No