Chemical Thermodynamics

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1. 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
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2. 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)

3. 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

4. Which of these is NOT a thermodynamic law?

  • It is impossible to convert heat completely into different forms of energy (2nd Law)
  • Energy can never be created nor destroyed (3rd Law)
  • The total energy of an isolated system remains the same (1st Law)

5. Which of these statements is not related to entropy

  • Entropy never decreases in an isolated system
  • Inequality of Clausius - (when energy changes form- some part is lost as entropy)
  • S= Kb ln W
  • 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)
  • Entropy increases until equilibrium is reached in an isolated system
  • Change in S> change in H / T

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