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6. Which of these statement aren't true about steady state? (about biological systems
- System produces work and is irreversible
- The thermodynamic system is open
- Entropy is not in maximum but change in entropy is apprx. constant
- It is an equilibrium of input and output of substances/energy
- The equation is at equilibrium
- Gibbs is not minimum and chnage in gibbs is approx constant
7. Which of these statements is not related to entropy
- Entropy increases until equilibrium is reached in an isolated system
- Entropy never decreases in an isolated system
- Inequality of Clausius - (when energy changes form- some part is lost as entropy)
- At equlibrium entropy always decreases in an isolated sytsem
- An Isolated system spontaneously passes to the most probable state (a macroscopic state with the highest no. of microscopic state)
- Change in S> change in H / T
- S= Kb ln W
8. Which of these do not affect reaction rate?
- Temperature
- Pressure
- Physical state of compounds (are of contact between different phases)
- Conc of reactants (same phase)
9. Which of these systems is incorrect?
- Isolated system - Matter and energy not exchanged with the surroundings
- Closed system - Matter and energy not exchanged with the surroundings
- Open System - exchange of matter and energy with the surroundings
10. What is a catabolic pathway in terms of Gibbs energy?
- Change in Gibbs > 0 endogonic pathways eg biosynthesis
- Change in Gibbs < 0 exergonic pathways eg degradation of nutrients to obtain available energy
- Change in Gibbs < 0 exergonic pathways eg biosynthesis
- Change in Gibbs > 0 endogonic pathways eg degradation of nutrients to obtain available energy
11. Which of these is not a feature of spontaneous reaction?
- An e.g osmosis, expansion of compressed gas
- When spontaneous reaction proceeds - energy is released
- The reversion of the sponstaneous process is unreal
- During Spontaneous process - the total energy increases
- Spontaneous reaction proceeds until equilibrium is reached
12. If Q
- Change in Gibbs < 0 And the reaction will go from right to left
- Change in Gibbs < 0 And the reaction will go from left to right (spontaneous)
- Change in Gibbs > 0 And the reaction will go from left to right (spontaneous)
- Change in Gibbs > 0 And the reaction will go from right to left
13. In terms of the system - change in H > 0 - means...
- That the system has gained energy (endothermic)
- That the system has lost energy (endothermic)
- That the system has gained energy (exothermic)
- That the system has lost energy (exothermic)
14. Which of these is NOT an expression for Change in Gibbs energy?
- ΔG=ΔG0+RTlnQ
- ΔG = ΔU + QW
- ΔG=ΔH−TΔS
- ΔG=−nFE (Faraday's constant for redox reactions)
- ΔG=∑ΔG(f-products)−∑ΔG(f-reactants)
15. which of these is not true about isolated systems?
- It can spontaneous pass to the most probable state.
- An example is a biological live system.
- A system which does not exchange matter or energy
16. What is the pressure volume work done ON a system equation?
- Change in U = Q + p(Change in V)
- Change in U = Q + W
- Change in U = Q - p(Change in V)
- Change in U = W + p(Change in V)
17. Which of these does change in Gibbs energy NOT depend on?
- Temperature and pressure
- The useful work
- Change in entropy and enthalpy
- Concentration of reactants and products
- On their chemical constitutions
18. Which of these biochemical reactions does not require energy?
- Motion - muscle work
- Passive transport of ions and molecules
- Maintainence of temp
- Synthesis of biological compounds
- Electrical activity of the nervous system
19. Why does in liquids the Change in U approximately equals to Change in H when volume pressure work occcurs?
- Because energy in solids is negligible
- Because pressure in liquids is negligible
- Because energy in liquids is negligible
- Because pressure in solids is negligible
20. Which of these is not standard state?
- 298 K
- 1 mol/l
- 273 C
- 101 325 Pa
