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  • 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. 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. Chemistry Item 10-03
    • LONDON (DISPERSION) FORCES
    • most common type of intermolecular force of attraction present in all
    • molecular substances
    • IMF present among adjacent
    • non-polar molecules and noble gases
    • involves the attraction between temporary or induced dipoles in adjacent molecules
    www.upcatreview.com
  • 4. Chemistry Item 10-03
    • DIPOLE-DIPOLE INTERACTION
    • involves the interaction between polar
    • molecules wherein adjacent molecules orient in such a way that
    • the negative pole of one
    • molecule is attracted to
    • the positive pole of a
    • neighboring molecule
    www.upcatreview.com
  • 5. Chemistry Item 10-03 London dispersion force and Dipole-dipole interaction are collectively known as VAN DER WAALS FORCES www.upcatreview.com
  • 6. Chemistry Item 10-03
    • HYDROGEN BOND
    • exists between molecules wherein
    • a hydrogen atom is bonded to a
    • very electronegative atom such
    • as fluorine, oxygen and
    • nitrogen. For H-bonding to
    • occur, hydrogen must be bonded to F, O or
    • N with at least one lone pair of electrons
    www.upcatreview.com
  • 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. 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. 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. 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