University:
Boston University
Course:
CAS CH 101 | General Chemistry 1
Academic year:

2022
Views:

419

Pages:

3
Author:

a2h1gvc2q

TP Which of the following molecules are not polar? 17% 17% 17% 17% 17% 17% 1. 2. 3. 4. 5. 6. BFCl2, whose shape is trigonal‐planar, like that of BF3 SCl2, which is a bent molecule, like H2O NH2Cl, whose shape is trigonal‐pyramidal, like that of NH3 OCS, which is a linear molecule, like CO2 All of the above are nonpolar All of the above are polar The more different the χ’s, the more polar the bond For today … • Complete: Polarity • Dipole‐dipole versus temporary dipole attraction dispersion Molecular polarity • If bond dipoles cancel, molecule is nonpolar • If bond dipoles do not cancel, molecule is polar • If two bonded atoms are different, the one with larger χ gets more of the shared electron cloud • Atom with larger χ has net negative charge; atom with smaller χ has net positive charge • The larger the difference in χ, the greater the charge separation unequal sharing of electron cloud • Result is a polar bonds Let’s illustrate, for BF3 and BH2F 1 Consider polarity of the following • BFCl2, whose shape is trigonal‐planar, like that of BF3 • SCl2, which is a bent molecule, like H2O • NH2Cl, whose shape is trigonal‐pyramidal, like that of NH3 TP Which of the following molecules are not polar? 17% 17% 17% 17% 17% 17% 1. 2. 3. 4. 5. 6. BFCl2, whose shape is trigonal‐planar, like that of BF3 SCl2, which is a bent molecule, like H2O NH2Cl, whose shape is trigonal‐pyramidal, like that of NH3 OCS, which is a linear molecule, like CO2 All of the above are nonpolar All of the above are polar • OCS, which is a linear molecule, like CO2 Quiz Which of the following statements is true about carbon dioxide, O C O? 25% 25% 25% 25% 1. 2. 3. 4. CO2 contains polar bonds and is a polar molecule CO2 contains polar bonds, but is not a polar molecule CO2 does not contain polar bonds and is not a polar molecule CO2 does not contain polar bonds but is a polar molecule Dipole‐dipole versus dispersion 2 Permanent dipoles Sketch a second molecule arranged so that it … attracts maximally repels maximally neither attracts nor repels 3