Question

9. Large intermolecular forces in a substance A) low vapor pressure B) high boiling point C) high heats of fusion and vaporization O) high critical temperatures and pressures E) all of the above are manifested by 10. Of the following A) CBr4 is the most volatile. B) CCl4 C) CH4 D) CF4 E) C6H14 Refer to the phase diagram below to complete questions 11-13 1.5 P (atm) 1.0 0.5 0 100-1-20 30 40 50 6070 T C'C) 11. What is the normal boiling point of the substance? 12. What is the normal melting point of the substance? 13. What phase would exist at STP? 14. A solid has a very high melting point, great hardness, and poor electrical conduction. This is atn) solid A) ionic B) molecular C) metallic D) covalent network E) metallic and covalent network

Answer 1

9) large intermolecular forces are manifested by high heats of fusion and vapourisation.

10) CCl4

11) normal boiling point is 50^oC

12) normal melting point is 20^oC

13) liquid state

14) mettalic solid