CHAPTER 11 QUESTIONS 18) What is the strongest intermolecular force in a liquid

Question

CHAPTER 11 QUESTIONS 18) What is the strongest intermolecular force in a liquid containing molecules with H o bonds? covalent bonds B) dipole forces C) dispersion D) hydrogen bonds E) none of the above Sectiont 11.2 The Intermolecular Bond Concept 19) Consider the following liquids with similar molar masses. Predict which has the strongest intermolecular attraction based only on boiling point data. A) butyl alcohol (Bp 760 mm Hg 117 "C) B) ethyl ether (Bp 760 mm Hg 35 C) C) pentane (Bp 760 mm Hg 36 C) D) propionic acid (Bp 760 mm Hg 141 *C) E) propyl chloride (Bp 760 mm Hg 47 "C Section: 11.3 vapor Pressure, Boiling Point, Viscosity, and Surface Tension 20) Which of the following is an observed property of solids? A) Solids have a variable shape and fixed volume. B) Solids can have noncrystalline structures. C) Solids compress and expand significantly.

Explanation / Answer

(18) (d) Hydrogen bonds.

Molecules in which H is attached to N, O or F can form an electrostatic attractive forces among its molecules in between partially positively charge H and partail negatively charged electronegative atom. This type of attractions are called hydrogen bonding.

(19) (D) Propanoic acid.

Boling point is dirctly proportional to strength of attractions.

(20) (B) Solids can exist in both cyrstalline and noncrystalline structure.

(21) (a) Ionic crytals have regular arrangement of ions in theiry crystal geometry.

(22) (b) Metallic solids. The constituent particle sin Metallic solids are metal atoms.

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