4) Argon gas has its triple point at 189. 3°C and 516 mm Hg. It has a critical p

Question

4) Argon gas has its triple point at 189. 3°C and 516 mm Hg. It has a critical point at-122 C and 48 atm. The density of the solid is 1.65 g/cm', whereas that of the liquid is 1.40 g/cm. Sketch the phase diagram for argon and use it to fill in the blanks below with the words "boils," "melts," "sublimes," or "condenses a) Solid argon at 500 mm Hg- b) Solid argon at 2 atm c) Argon gas at -150°C d) Argon gas at -165 C when the temperature is increased. when the temperature is increased when the pressure is increased when the pressure is increased Arrange the following in order of decreasing boiling point. a) I2 5) b) F2 c) Cl2 d) Bre Which of the following would you expect to show dispersion forces? Dipole forces? a) SCl2 6) b) SiCl c) CO d) CCl,F2 7) Which of the following would show hydrogen bonding? b) HO-OH a) CH,F c) NHs d) H C-O CH3 8) Explain in terms of intermolecular attractive forces between structural units why a) HI has a higher boiling point than HBr b) GelHs has a higher boiling point than SiH c) H,O2 has a higher melting point than CsIHs d) NaCI has a higher boiling point than CH,OH For each of the following pairs, choose the member with the lower boiling point Explain your reason in each case a) CO or SO 9) b) HBr or HC c) H; or O d) F, or Cl

Explanation / Answer

4)

a) Solid Argon at 500mm Hg Sublimes with temperature is increased.

b) Solid Argon at 2 atm Melts with temperature is increased.

c)  Argon gas at -150oC Condeses with temperature is increased.

d)  Argon gas at -165oC Condeses with temperature is increased.

5) The decresing order of boiling point of halogens is:

I2>Br2>Cl2>F2

Atom size increases down the group. So, due to increase in the strength of Van der Waals forces down the group, the boiling points of halogens will increase.

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