c1003

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c1003

  1. 1. Chemistry Item 10-03 Which molecule will NOT exhibit hydrogen bonding? A. H 2 O B. NH 3 C. H 3 P D. HF www.upcatreview.com
  2. 2. Chemistry Item 10-03 Intermolecular Forces of Attraction ( IMF ) are (weak) attractive forces between molecules. The concept of IMF explains the occurrence of phase changes. The different types of intermolecular forces are differentiated as follows: www.upcatreview.com
  3. 3. Chemistry Item 10-03 <ul><li>LONDON (DISPERSION) FORCES </li></ul><ul><li>most common type of intermolecular force of attraction present in all </li></ul><ul><li>molecular substances </li></ul><ul><li>IMF present among adjacent </li></ul><ul><li>non-polar molecules and noble gases </li></ul><ul><li>involves the attraction between temporary or induced dipoles in adjacent molecules </li></ul>www.upcatreview.com
  4. 4. Chemistry Item 10-03 <ul><li>DIPOLE-DIPOLE INTERACTION </li></ul><ul><li>involves the interaction between polar </li></ul><ul><li>molecules wherein adjacent molecules orient in such a way that </li></ul><ul><li>the negative pole of one </li></ul><ul><li>molecule is attracted to </li></ul><ul><li>the positive pole of a </li></ul><ul><li>neighboring molecule </li></ul>www.upcatreview.com
  5. 5. Chemistry Item 10-03 London dispersion force and Dipole-dipole interaction are collectively known as VAN DER WAALS FORCES www.upcatreview.com
  6. 6. Chemistry Item 10-03 <ul><li>HYDROGEN BOND </li></ul><ul><li>exists between molecules wherein </li></ul><ul><li>a hydrogen atom is bonded to a </li></ul><ul><li>very electronegative atom such </li></ul><ul><li>as fluorine, oxygen and </li></ul><ul><li>nitrogen. For H-bonding to </li></ul><ul><li>occur, hydrogen must be bonded to F, O or </li></ul><ul><li>N with at least one lone pair of electrons </li></ul>www.upcatreview.com
  7. 7. Chemistry Item 10-03 For question #1, from the concept of London dispersion forces, this type of IMF is present among adjacent non-polar and noble gases. Thus the interaction between and among non-polar molecules is referred to as dispersion forces ( letter A ). www.upcatreview.com
  8. 8. Chemistry Item 10-03 For question #2, based on the definition intermolecular forces are also known as weak forces ( letter A ). www.upcatreview.com
  9. 9. Chemistry Item 10-03 For item #3 which involves the concept of Hydrogen bond, H-bonding will only occur among molecules where H is bonded to F, O or N. From the options, the molecules H 2 O, NH 3 , and HF will undergo H-bonding because all these molecules have a hydrogen atom attached to either F, N or O. www.upcatreview.com
  10. 10. Chemistry Item 10-03 On the contrary, in H 3 P, the H atom is attached to phosphorus (P) and not to F, N, or O thus this molecule will not undergo H-bond. The answer is letter C . www.upcatreview.com

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