City University of New York Department of Chemistry 35) water exists in differen
ID: 531784 • Letter: C
Question
City University of New York Department of Chemistry 35) water exists in different forms depending on the pressure and temperature. A portion of the phase diagram for ice l ice Ill and liquid water is shown below. What Ice III statement about the densities of three phases is correct. Liquid a. The density of liquid water A Ice I is greater than the densities of either ice I or ice III. b. The density of ice I is Temperature greater than the densities of either ice III c. The or liquid water. density of ice I and ice Ill are equal and they are both denser than the density of liquid water. d. The density of ice III is greater than the densities of either ice I or liquid water 36) The electron affinities of five elements are given below. Which statement best explains why the electron affinity at phosphorus does not follow the general trend. 13Al 12 kcal/mole Si 32 kcalmole ISP 17 kcal/mole 48 kcal/mole 87 kcal/mole a. The 4th p electron in sulfur is spin paired b. Gaining an electron in phosphorus will increase electron-electron repulsions in half filled orbitals. c The valence orbitals in silicon exists at higher energy than the valence orbitals in phosphorus. d. The valence electrons in phosphorus are held less tightly by the nucleus than the valence electrons in silicon. e. None of the above provides an adequate explanation for the discontinuity that is observed at phosphorus.Explanation / Answer
Ans 35. d. Density of ice III is greater than the densities of Ice I or liquid water.
Ice III as seen from the graph is at higher pressure , so that the molecules are compressed and under pressure , occupying less volume , hence heavier.
Liquid water though higher in pressure but exists at higher temperature tahn Ice III, hence occupies more volume as compared to ice III
so ice iii is denser.