A block of ice is reduced in temperature from -5º C to -10º C. As a consequence, which of the following is true?
The entropy of the block of ice has increased.
The total entropy of the universe has increased.
The temperature of the air surrounding the block of ice has decreased.
The average kinetic energy per molecule of the water has increased.
[Show/hide explanation]
Let's evaluate the answer choices, one by one. The entropy of the block of ice has not increased, it has decreased the ice gets colder. However, the universe must pay the price; since the process isn't reversible, the entropy of the universe must increase. So choice (B) is correct.
My Q is why does the total entropy of the universe increased if the temp of ice block is decreased?
The entropy of the block of ice has increased.
The total entropy of the universe has increased.
The temperature of the air surrounding the block of ice has decreased.
The average kinetic energy per molecule of the water has increased.
[Show/hide explanation]
Let's evaluate the answer choices, one by one. The entropy of the block of ice has not increased, it has decreased the ice gets colder. However, the universe must pay the price; since the process isn't reversible, the entropy of the universe must increase. So choice (B) is correct.
My Q is why does the total entropy of the universe increased if the temp of ice block is decreased?
