Econ Set
Draw the Lewis structure for the CS2 molecule. Which of the following accurately describes this structure?
There are eight nonbonding electrons
Which of the following species will have an expanded octet?
XeF 2
All three of the boron-fluorine single bonds in BF3 are polar. In which direction should the polarity arrows point?
away from the central boron atom
What is the molecular geometry of OF2?
bent
Calculate the formal charge on each of the oxygen(O)
formal change on Oa,Ob,Oc,: 0,-1
Calculate the formal charge on the chlorine (Cl) atom.
formal charge on Cl = 0
What are the formal charges on the sulfur (SS), carbon (CC), and nitrogen (NN) atoms, respectively, in the resonance structure that contributes most to the stability of the thiocyanate ion, SCN−? The possible resonance structures for the thiocyanate ion, SCN-, are
formal charge on sulfur (SS), carbon (CC) and nitrogen (NN) atoms = 0,0,-1
What is the molecular geometry of BeF2?
linear
What is the electron geometry/molecular geometry of ClF5?
octahedral, square pyramidal
What is the molecular geometry of a molecule with 4 outer atoms and 1 lone pair on the central atom?
sea saw
What is the molecular geometry of a molecule with 4 outer atoms and 2 lone pairs on the central atom?
square planar
What shape would you expect for XeF4?
square planar
What is the molecular geometry of NH3?
trigonal pyramid
Which statement best describes an O3 molecule
Each atom in ozone is connected to another atom by a bond having a bond order of 1.5.
Which of the following pairs of elements would form the covalent bond with the largest dipole moment?
Ge & O
Which the following correctly describes resonance structures?
Resonance stabilizes structure.
What is molecular geometry of XeF4?
Square planar
What is the molecular geometry of a molecule with 3 outer atoms and 2 lone pairs on the central atom?
T-shape
Assuming all bonded groups are identical, which of the following VSEPR geometries must produce a nonpolar molecule?
Tetrahedral
Which choice best describes the polarity of ClF5?
The molecule is polar and has polar bonds.
Of the molecules AlCl3and A l Br3, which has bonds that are more polar?
AlCl3
In the molecule BrI, which atom is the negative pole?
Br
Consider the following element combinations. Classify the bonds formed between each pair as ionic, polar covalent, or nonpolar covalent based solely on each element's position on the periodic table.
(IONIC): As-a, Rb-N, Ca-Cl (POLAR COVALENT): O-Br, S-Br, P-Cl (NONPOLAR COVALENT): S-S, F-F
What are the formal charges on BB and FF, respectively, in the B=FB=F bond of the following Lewis structure?
-1, +1
Which choice represents a pair of resonance structures?
0-N---0 , O---N-O
How many resonance structures can be drawn for ozone, O3
2
How many valence electrons must be accounted for in the Lewis structure of chloroethane (C2H5Cl)?
20
How many valence electrons should be used to draw the Lewis structure for the following species: SO32−
26
Ignoring lone-pair effects, what is the smallest bond angle in ClF5?
90 degrees
In looking at the bolded atoms in the answer choices, which pair consists of molecules having the same geometry?
CH2CCl2 && CH2CCl2
Examine the sets of bonds given in the choices. Which one arranges the bonds in order of increasing (shortest to longest) bond length?
C—F, C—Cl, C—Br, and C—I
What are the expected bond angles in ICl4+?
90 degrees, 120 degrees, 180 degrees
Consider the Lewis structure for PCl3. (what are the approximate bond angles?)
<109.5
