Chemical Thermodynamics

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1. which of these is not true about isolated systems?

  • An example is a biological live system.
  • A system which does not exchange matter or energy
  • It can spontaneous pass to the most probable state.
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2. What is a catabolic pathway in terms of Gibbs energy?

  • Change in Gibbs < 0 exergonic pathways eg biosynthesis
  • Change in Gibbs < 0 exergonic pathways eg degradation of nutrients to obtain available energy
  • Change in Gibbs > 0 endogonic pathways eg degradation of nutrients to obtain available energy
  • Change in Gibbs > 0 endogonic pathways eg biosynthesis

3. Which of these biochemical reactions does not require energy?

  • Passive transport of ions and molecules
  • Synthesis of biological compounds
  • Maintainence of temp
  • Motion - muscle work
  • Electrical activity of the nervous system

4. If Pressure volume work is done BY the system and heat is absorbed then the equation will be?

  • Change in U = Change in Enthalpy - p(Change in V)
  • Change in U = Change in Enthalpy + W
  • Change in U = W + p(Change in V)

5. Which of these statement aren't true about steady state? (about biological systems

  • It is an equilibrium of input and output of substances/energy
  • Gibbs is not minimum and chnage in gibbs is approx constant
  • The equation is at equilibrium
  • Entropy is not in maximum but change in entropy is apprx. constant
  • System produces work and is irreversible
  • The thermodynamic system is open

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