BONDS!
Structures
Naming
Lewis Structures VSEPR and Hybridization and Polarity
Resonance and Formal Charge
100
Which of the following is the most polar bond?
H-F
N-F
F-F
H-F, F is the most electronegative atom, and hydrogen is the least. F attracts the shared electrons more than H does.
100
When a stress is applied to an ionic crystal, the planes of the ions slide and separate due to the alignment of like charges, as shown in the diagram. What characteristic of the crystal does this impact?
Brittleness; It makes it more brittle and easier to break.
100
Name the following: CCl4
carbon tetrachloride
100
Which of the following molecules has two sets of lone pairs?
NH3
H2O
BH3
CH4
H2O; draw the lewis structure.
100
Resonance is commonly used to describe the bonding in molecules of which of the following?
CO2
O3
H2O
SF6
O3; Draw the Lewis Structure
200
Which of the following molecules contains polar covalent bonds but is a non polar molecule?
CH3Cl
CH2Cl2
NH3
CCl4
CCl4; Each of the bonds are polar, but they are of equal strength in opposite direction, and thus cancel each other out.
200
Which represents an alloy of Ni and B?
a. 
b. 
c. 
d. 
a; Consider the sizes of Ni and B, there are not charges present, or an even number of the two elements.
200
Name the following: N2O4
Dinitrogen tetraoxide
200
How many sigma and pi bonds are present in CH3COOH?
Sigma:7 Pi: 1; draw the Lewis structure
200
What is the formal charge on the central nitrogen atom in a standard Lewis Structure of the nitrate ion?
+1; nitrate ion=NO3- FC=Ve-nonBe-1/2Be=5-0-1/2(8)=+1
300
Which of the following graphs correctly shows the relationship between potential energy and internuclear separation for two hydrogen atoms?
a. 
b. 
c. 
d. 
c
300
In order to conduct electricity, a substance must have what 2 things?
Freely moving particles, and charged particles.
300
Name the following: FeCl3
Iron (III) chloride
300
What is the bond order of O2?
2; BO=(#Be-#nonBe)/2
300
When evaluating multiple potential Lewis Structures for a molecule, which characteristic represents the most stable and preferred structure based on formal charge criteria?
The structure with formal charges closest to zero
400
Which molecule has the shortest bond length?
N2
O2
Cl2
I2
N2; Triple bond
400
How would solid LiBr look?
There should be alternating circles of Br- and Li+. Br- should be larger than Li+.
400
Name the following: Ca3(PO4)2
Calcium phosphate
400
What is the molecular geometry of SO3?
trigonal planar; Draw the VSEPR shape
400
What is the physical reality of resonance structures for a molecule?
The true structure is an average or hybrid of all valid resonance contributors, and the molecule does not rapidly flip between them.
500
Which compound contains both ionic and covalent bonds?
C2H5OH
MgF2
NH4Cl
H2S
NH4Cl; NH4 is covalent, and the bond between N and Cl is ionic.
500
What types of bonds are good conductors?
Metallic bonds, or molten and dissolved ionic bonds.
500
Provide the formula for the following name:
Lead(III) sulfate
Pb2(SO4)3
500
What is the hybridization of carbon in HCONH2?
sp2; Draw the Lewis Structure and count the electron domains around C.
500
What is the formal charge on each of the atoms in NH3?
0