Entropy change when heat flows
Grade 11 Science Worksheet
Circle the best answer, or write your answer on the line.
1200 J of heat flows from a hot reservoir at 600 K to a cold one at 300 K. What is the total entropy change, to 0.01 J/K, Bo?
900 J of heat flows from a hot reservoir at 450 K to a cold one at 300 K. What is the total entropy change, to 0.01 J/K, Esme?
In the bar chart, what are the entropy changes of the two reservoirs, Kira?
- Hot −3 J/K; cold +6 J/K
- Hot +3 J/K; cold −6 J/K
- Hot +3 J/K; cold +6 J/K
In the bar chart, what is the total entropy change, Luz?
Use the picture in question 3.
- +9 J/K
- −3 J/K
- +3 J/K
500 J flows from a 500 K block to a 250 K block. Which statement fits, Milo?
- The total rises by 1 J/K
- The total falls by 1 J/K
- The total rises by 3 J/K
What does the entropy form of the second law say, by Noah's reading (OpenStax)?
- No single object's entropy can ever fall, in any process
- A closed system's entropy never decreases
- Entropy stays fixed in each process
A refrigerator moves heat out of its cold inside. Can the inside's entropy fall, Ren?
- No; entropy can't fall in any place
- Yes; the room gains more, so the total still rises
- Yes; and the total entropy falls too
Ice melts at 273 K. What happens to the entropy of the water, by Tala's reading (OpenStax)?
- It falls
- It rises
- It stays the same, since T is steady
Water freezes at 273 K, giving heat to the colder freezer air. What happens to the water's entropy, Zee?
- It rises, since ice forms
- It cannot fall, since entropy can't go down
- It falls, while the surroundings gain more
Why is liquid water more disordered than ice, by Ari's reading (OpenStax)?
- Its molecules are packed in a fixed pattern
- Its molecules can be arranged in many more ways
- It has fewer molecules than the ice
