Matching System-Surrounding Diagrams to Chemical Reactions
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Questions and Answers

What is the correct system-surroundings diagram for the reaction 4 CO2 (g) + 6 H2O (g) → 2 C2H6 (g) + 7 O2 (g) at constant temperature and external pressure?

  • Sys-Surr Diagrams-3.jpg
  • Sys-Surr Diagrams-2.jpg
  • Sys-Surr Diagrams-4.jpg (correct)
  • Sys-Surr Diagrams-1.jpg
  • Which system-surroundings diagram represents the forward chemical reaction H2 (g) + Br2 (l) → 2 HBr (g) at constant temperature and external pressure?

  • Sys-Surr Diagrams-1.jpg
  • Sys-Surr Diagrams-4.jpg (correct)
  • Sys-Surr Diagrams-3.jpg
  • Sys-Surr Diagrams-2.jpg
  • What is the correct system-surroundings diagram for an air-filled balloon that contracts in volume when placed in a small amount of liquid nitrogen at –196 °C?

  • Sys-Surr Diagrams-1.jpg (correct)
  • Sys-Surr Diagrams-2.jpg
  • Sys-Surr Diagrams-3.jpg
  • Sys-Surr Diagrams-4.jpg
  • Which system-surroundings diagram represents a cup of water that evaporates into a gas and releases to the atmosphere under constant atmospheric pressure?

    <p>Sys-Surr Diagrams-1.jpg</p> Signup and view all the answers

    What is the sign of ΔH for the reaction 4 CO2 (g) + 6 H2O (g) → 2 C2H6 (g) + 7 O2 (g)?

    <p>Positive</p> Signup and view all the answers

    What is the effect of the reaction H2 (g) + Br2 (l) → 2 HBr (g) on the system at constant temperature and external pressure?

    <p>Increase in volume</p> Signup and view all the answers

    What is the sign of ΔS°sys for the reaction 2 C2H6 (g) + 7 O2 (g) → 4 CO2 (g) + 6 H2O (g)?

    <p>Negative</p> Signup and view all the answers

    At what temperature is the reaction 2 H (g) → H2 (g) spontaneous?

    <p>All temperatures</p> Signup and view all the answers

    What is the sign of ΔS°surr for the compression of gas in a closed system?

    <p>Negative</p> Signup and view all the answers

    Under what conditions is the reaction CO2 (s) → CO2 (g) spontaneous?

    <p>High temperatures</p> Signup and view all the answers

    What is the relationship between ΔS°sys and ΔS°surr during the reaction 2 C2H6 (g) + 7 O2 (g) → 4 CO2 (g) + 6 H2O (g)?

    <p>ΔS°sys is negative, ΔS°surr is positive</p> Signup and view all the answers

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