Consider the collection of nonmetallic elements O, P, Te, I and B.
(a) Which two would form the most polar single bond?
(b) Which two would form the longest single bond?
(c) Which two would be likely to form a compound of formula XY2?
(d) Which combinations of elements would likely yield a compound of empirical formula X2Y3?
H H Chapter 12.3 H H Intermolecular Forces © 2015 Pearson Education, Inc. Attractive Forces • The particles are attracted to each other by Intermolecular forces. • The strength of the attractive forces depends on the kind(s) of particles. – The stronger the attractive forces between the particles, the more the particles resist Moving. (0 kelvin) • However, no material completely lacks particle motion. © 2015 Pearson Education, Inc. Intermolecular Forces • The strength of the attractions between the particles of a substance determines its State (solid,liquid,and gas) At room temperature, moderate to strong attractive forces result in materials being Solids or Liquids The stronger the attractive forces are, the Higher will be the boiling point of the liquid and the melting point of the solid. © 2015 Pearson Education, Inc. Why Are Molecules Attracted to Each Other • Intermolecular attractions are due to attractive forces between opposite charges. – (+) ion to (−) ion – (+) end of polar molecule to (−) end of polar molecule – Even nonpolar molecules will have Temporary charges. • Larger charge = stronger attraction • Longer distance = weaker attraction • Intermolecular attractive forces are small relative to the bonding forces between atoms (intramolecular). – smaller charges – over much larger distances © 2015 Pearson Edu