Entropy change when heat flows

Answer Key - Grade 11 Science Worksheet - Building Confidence

Circle the best answer, or write your answer on the line.

1. 1.

   A container of gas absorbs 600 J of heat slowly at a steady 27 °C. What is its entropy change, to 0.01 J/K, Ari? Add 273 to change °C to K.

   2 J/K
2. 2.

   A container of gas absorbs 1500 J of heat slowly at a steady 227 °C. What is its entropy change, to 0.01 J/K, Bo? Add 273 to change °C to K.

   3 J/K
3. 3.

   A container of gas absorbs 1000 J of heat slowly at a steady 127 °C. What is its entropy change, to 0.01 J/K, Kira? Add 273 to change °C to K.

   2.5 J/K
4. 4.

   A cup of water gains 300 J of heat at 300 K. What is the sign of its entropy change, Jun?

   • Zero, since its temperature held
   • Positive: +1 J/K
   • Negative: −1 J/K
5. 5.

   A hot block loses 800 J of heat at 400 K. What is its entropy change, Luz?

   • −0.5 J/K
   • +2 J/K
   • −2 J/K
6. 6.

   Which object's entropy rises, Milo?

   • An ice cube taking in heat from the air
   • A hot pan losing heat to the counter
   • A stove burner giving off heat to a pan
7. 7.

   In ΔS = Q ÷ T, which temperature scale must T use, by Pia's reading (OpenStax)?

   • Degrees Celsius
   • Kelvins
   • Degrees Fahrenheit
8. 8.

   What are the units of entropy, Ren?

   • W (watts)
   • J/K (joules per kelvin)
   • J/°C (joules per degree Celsius)
10. 9.

    In the bar chart, what is the hot reservoir's entropy change, Tala?

    • +1 J/K
    • −2 J/K
    • −1 J/K
11. 10.

    In the bar chart, what is the cold reservoir's entropy change, Zee?

    Use the picture in question 9.

    • −2 J/K
    • +1 J/K
    • +2 J/K