Which of the following is true?
A. The internal energy of a system is comprised solely of the rotational, translational and vibrational kinetic energy of the molecules.
B. All ideal gases have CV* = (3/2)R.
C. A substance’s state of matter is that of a “supercritical fluid” if it is either at a temperature above its critical temperature, or at a pressure above its critical pressure.
D. The Gibbs phase rule indicates that a pure compound at its triple point has one degree of freedom.
E. None of the above are true.
A. Incorrect. Microscopic potential energy also contributes to internal energy.
B. Incorrect. Only monatomic ideal gases have CV* = (3/2)R.
C. Incorrect. Temperature and pressure must both be greater than the critical pressure and temperature. A substance above the critical pressure but below the critical temperature is a liquid. A substance above the critical temperature but below the critical pressure is a gas.
D. Incorrect. For a pure compound at the triple point, ? = 3 and C = 1, leaving F = 0; no degrees of freedom. In other words, the triple point is unique for a compound.
E. Correct.
?
You might also like to view...
Given that the number of arrivals of data packet in the receiver follows a Poisson distribution on which arrival rate is 10 arrivals per second. What is the probability that the number of arrivals is more than 8 but less than 11 during a time of interval of 2 seconds?
What will be an ideal response?
The name given to cuts of lumber reflects the ____________________ size
Fill in the blank(s) with the appropriate word(s).
For laminating gypsum boards to each other, joint compound adhesives and ____ adhesives are used.
a.visible light curing b.contact c.thermoplastic d.reactive
Before flushing any system, all in-line devices, such as soft-seated control valves and magnetic flowmeters, must be _____
A) removed B) closed C) calibrated D) opened