Intermolecular Forces (PAL Worksheet)

PAL Worksheet   Intermolecular  Forces   Name:  ______________   Discuss  the  following  with  your  group  to  come  up  with  a  consensus  explanation.   1. What  is  the  dominant  intermolecular  force  present  in  H2?    Explain  below.   A)  Dispersion     B)  Ion-­‐dipole     C)  Hydrogen  bonding     D)  Dipole-­‐dipole     _____________________________________________________________________________________   2. What  is  the  dominant  intermolecular  force  present  in  CHF3?    Explain  below.     A)  Dispersion     B)  Ion-­‐dipole     C)  Hydrogen  bonding     D)  Dipole-­‐dipole     _____________________________________________________________________________________   3. What  is  the  dominant  intermolecular  force  present  in  CH3OH?    Explain  below.   A)  Dispersion     B)  Ion-­‐dipole     C)  Hydrogen  bonding     D)  Dipole-­‐dipole     _____________________________________________________________________________________   4. What  type  of  intermolecular  force  causes  the  dissolution  of  NaCl  in  water?    Explain  below.   A)  Dispersion     B)  Ion-­‐dipole     C)  Hydrogen  bonding     D)  Dipole-­‐dipole     _____________________________________________________________________________________   5. Choose  the  molecule  or  compound  that  exhibits  dispersion  forces  as  its  strongest  intermolecular   force.    Explain  below.     A)  CO       B)  HF       C)  Cl2       D)  NaCl     _____________________________________________________________________________________   6. Place  the  following  compounds  in  order  of  decreasing  strength  of  intermolecular  forces:    HF,  O2,  CO2     __________<__________<__________     Explain  your  ranking:  ___________________________________________________________________   _____________________________________________________________________________________   7. Choose  the  substance  with  the  highest  vapor  pressure  at  a  given  temperature.     A)  RbCl       B)  CH3SCH3     C)  BF3       D)  SbH3     E)  SiS2     Explain  your  choice:  ____________________________________________________________________   _____________________________________________________________________________________         8. Choose  the  substance  with  the  highest  boiling  point.     A)  CH4       B)  I2       C)  KI       D)  HF       E)  CS2   Explain:  ______________________________________________________________________________   9. Which  of  the  following  substances  would  you  predict  to  have  the  highest  ΔHvap?     Explain:    ______________________________________________________________________________   10. Place  the  following  substances  in  order  of  decreasing  boiling  point.              N2   O2     H2   __________>__________>__________   Explain:   _____________________________________________________________________________________   Refer  to  the  phase  diagram  to  the  right  for  the  following  questions:   1. Which  phase  is  represented  by  the  letters  (a),  (b),  and  (c)?   (a)  __________  (b)  ___________  (c)  ___________   2.  The  boundary  between  (a)  and  (b)  represents  the…   _________________________________________   3.  The  point  represented  by  (d)  corresponds  to  the…   _________________________________________   4.  The  point  represented  by  (e)  corresponds  to  the…   _________________________________________   5.  Describe  the  phase  changes  associated  with  moving  from  point  (a)  to  (b):  ______________________   6.  Describe  the  phase  changes  associated  with  moving  from  point  (c)  to  (b):  ______________________   7.  How  much  heat  is  released  when  105g  of  steam  at  100.0  oC  is  cooled  to  ice  at  -­‐15.0  OC?    The  enthalpy   of  vaporization  of  water  is  40.67  kj/mol,  the  enthalpy  of  fusion  for  water  is  6.01  kj/mol,  the  specific  heat   capacity  of  liquid  water  is  4.18  J/goC  and  the  specific  heat  capacity  of  ice  is  2.02  J/goC.       (q  heating=  m  x  C  x  ΔT,  q  phase  change  =  ΔHvap  x  n)