Calculations
Determine the electronegativity difference between Be-Al
0
Determine the dipole movement between B-F
the dipole arrow points toward F because it is more electronegative
Draw the lewis structure for HF4
F is the central atom with four H atoms single-bonded to it
What is the weakest IMF?
dispersion
Write the formula for boron trichloride
BCl3
Determine the molar mass of OF3 (O= 16, F=19)
73 g/mol
What is the polarity between MgO?
ionic
Draw the lewis structure for SO2. What is the electron density geometry and molecular shape?
trigonal planar, bent
Identify the IMFs in SO3
dispersion, dipole-dipole
Name ClO4 ^-
perchlorate
How many molecules are in 0.0237 moles of NO2?
1.43 x10^22 molecules
Rank the electronegativities lowest to highest of the following elements: Li F C P N
Li P C N F
Draw the lewis structure for CH2Cl2. What is the electron density geometry and molecular shape?
tetrahedral, tetrahedral
Identify the strongest IMF in NCl3
dipole-dipole
Write the formula for selenium dioxide
SeO2
What is the mass in grams of 0.450 moles of SO2? (S=32, O=16)
28.8 g
What is the polarity of the molecule SbCl3?
polar
Draw the lewis structure for SCN^-. What is the electron density geometry and molecular shape?
linear, linear
Which molecule has the strongest IMFs? NF3 or BCl3 or H2Te
NF3, hydrogen bonding is only present in this molecule
Name HSO3^2-
hydrogen sulfite
How many grams of Al are required to completely react with 81.2 g of MnO2? Balance the equation first. MnO2 + Al ----> Mn + Al2O3
33.6 g, balanced equation: 3MnO2 + 4Al --> 3Mn + 2Al2O3
What is the polarity of the molecule SeO2?
polar
How many electron domains are in BBr3?
3
Based on IMFs, which molecule would have the highest melting point? H2O or MgO or HCl
MgO, ion-dipole forces are the strongest which makes the melting point the highest
Write the formula for acetate
C2H3O2^-