Bond Type and Strength
Would the bond between Li and Cl be ionic or covalent? Explain your answer.
Ionic, Li is a metal and Cl is a nonmetal. Cl is more electronegative than Li and there is a full transfer of electrons between them.
Draw the complete Lewis structure of: CH4
Would the bond in O2 be polar or nonpolar?
Nonpolar (electronegativity difference would be 0!)
List all the intermolecular forces between a molecule of O2 and a water molecule.
dipole induced dipole
What kind of bond would form between S and F? Explain your answer
Polar Covalent, both S and F are nonmetals and F is more electronegative than S and electrons are shared unequally.
Draw the complete Lewis structure of: NH3
What is the shape of a molecule with one non-bonding pair of electrons and three bonding pairs?
trigonal pyramidal
Is the HCN molecule polar or nonpolar? Explain.
polar (Nitrogen is more EN than C)
Solid NaCl is dissolved in a beaker of water. List all the IMFs that exist in the beaker.
ion-dipole AND dipole-dipole (or HBF-HBF)
Which of the following has the stronger ionic bond and why?
KCl or MgO
MgO because Mg has a larger charge than K and O has a larger charge than Cl
Draw the complete Lewis structure of: HCN
What is the electron geometry around the oxygen atom in C2H5OH?
tetrahedral
Is BH3 a polar or nonpolar molecule? Explain.
nonpolar (no lone pairs on B and surrounded by all the same atom in a trigonal planar shape)
Which molecule would have the higher vapor pressure and why: NH3 or CH4?
CH4 because it is non-polar and only has LDF forces (NH3 has both LDF and HBF) and a higher vapor pressure. Vapor pressure is inversely related to IMF.
Which of the following substances has a higher melting point and why?
SiO2 and C2H6
SiO2, since it is a network covalent compound and C2H6 is a non-polar covalent compound. Network covalent compounds have higher stronger bonds and IMF and have higher melting points.
Draw the complete Lewis structure (including any resonance) of: CO32-
What is the hybridization of the central atom in ICl5?
sp3d2
Is SF5- a polar or nonpolar molecule?
polar (lone pair on S)
Which has a higher heat of vaporization and why: Cl2 or Br2?
Br2 because it has more electrons than Cl2 and is therefore more polarizable. Both molecules are nonpolar and only have LDF, but the more polarizable the atom, the stronger the LDF.
Which of the following substances has the shortest bond length? Explain.
O2, N2 and H2
N2 has triple bonds and the shortest bond length. O2 has double bonds and H2 has single bond.
Draw the complete Lewis structure (including any resonance) of: NO3-
AND calculate the formal charges of all atoms in one of the structures.
What is the hybridization of the central atom in ICl5?
sp3d2
Is ICl2 a polar or nonpolar molecule?
Nonpolar. All three lone pairs on I would be in the equatorial positions, while the Cl atoms would be axial and 180 degrees from eachother, making a linear shape overall.
You have two sealed jars. One has liquid H2S and the other has liquid H2O. Which jar would you expect to have more molecules in the gaseous state after 10 minutes and why?
H2S because it has LDF and DD and a higher vapor pressure. H2O has stronger hydrogen bonding so the molecules will be more likely to remain in the liquid form.