Question 1
What is the sign of Δ
S for each of the following processes?
I. | The separation of gaseous molecules of UF6, into 238UF6 and 235UF6 |
| at constant temperature and pressure. |
II. | The dissolving of I2(s) in CCl4(l). |
◦ Δ
S is positive for I and negative for II.
◦ Δ
S is negative for I and negative for II.
◦ Δ
S is negative for I and positive for II.
◦ Δ
S is positive for I and positive for II.
Question 2
According to the third law of thermodynamics,
◦ the entropy of the universe increases for any spontaneous process.
◦ the entropy of a perfectly ordered, crystalline substance is zero at 0 Kelvin.
◦ the entropy increases for any spontaneous process.
◦ energy is conserved in any transformation of matter.