I have these p-chem questions i need help with if anyone could please help! 1) W
ID: 1083119 • Letter: I
Question
I have these p-chem questions i need help with if anyone could please help!
1) Which of the following statements is true about heat and work? There may be more than one correct answer.
a. On a macroscopic level, a heat transfer only occurs when the temperature changes.
b. On a macroscopic level, w > 0 if the system undergoes contraction.
c. On a microscopic level, the work done on a system can be determined from the sum of the change in energy levels times the number of molecules in each level.
d. On a microscopic level, the change in heat can be determined from the sum of the change in energy levels times the number of molecules in each level.
2) Which of the following is true about heat capacity? There may be more than one answer.
a. For an ideal gas, the constant volume heat capacity equals the constant pressure heat capacity.
b. For one moles of atoms, the heat capacity equals (3/2)*R because there is no contribution from vibrational or rotational motion.
c. The heat capacity for rotational motion reaches the equipartition limit at a lower temperature than for vibrational motion.
d. Constant volume heat capacity can be determined by the slope of an internal energy vs. temperature curve.
Explanation / Answer
In first question the statements (a) and (b) are true.. because (a) heat always transfers from one place to another place if Temperature difference present there only.
(b) In contraction, work done on the system. That means its value is positive.
In the second question statements (b) and (d) are true.