Jeff's Stupid Exam Take 2
A molecule with the formula AB₃ has a trigonal pyramidal geometry. How many electron groups are on the central atom (A)?
4
draw the Lewis structure for SO₄²⁻. How many equivalent resonance structures can be drawn?
6
A molecule with a T-shaped molecular geometry has a bond angle of
< 90
According to VSEPR theory, the bond angle in H₂Se would be predicted to be
<109.5°
What type of bonding occurs in sodium chloride, NaCl?
ionic
The normal boiling point for HBrHBr is higher than the normal boiling point for HClHCl . This can be explained by
larger dispersion forces for HBr
Determine the molecular geometry about each interior carbon atom in CH₃OCH₃
tetrahedral
Determine the molecular geometry about interior carbon atom in CH₃OH
tetrahedral
Using the VSEPR model, the electron-domain geometry of the central atom in SF₂ is
tetrahedral
What are the electron and molecular geometries, respectively, for hydrogen sulfide, H₂S?
tetrahedral, bent
How many lone pairs are on the Br atom in BrCl₂⁻?
3
How many of the following elements can form compounds with an expanded octet? P Kr Xe B
3
Write a Lewis structure for the CO₃²⁻ ion. How many equivalent resonance structures can be drawn?
3
Give the number of valence electrons for SBr₄
34
determine which of the following is most stable F₂ Ne₂²₊ F2₂²⁻ F₂²⁺ O₂²⁺
O₂²⁺
Is B₂⁻ paramagnetic or diamagnetic?
Paramagnetic
Draw the best Lewis structure for CCl₃⁺¹. What is the formal charge on the C?
+1
Draw the best Lewis structure for the free radical, NO₂. What is the formal charge on the N?
+1
Draw the best Lewis structure for CI₃⁻¹. What is the formal charge on the C?
-1
How many lone pairs are on the central atom in BCl₃
0
In the best Lewis structure for NO +, what is the formal charge on the N atom?
0
What is the bond order for a second-period diatomic molecule containing five electrons in antibonding molecular orbitals and six electrons in bonding molecular orbitals?
0.5
How many of the following molecules have sp3 hybridization on the central atom? XeCl₄ CH₄ SF₄ C₂Cl₂
1
What is the bond order of B₂⁻
1.5
The bond angle in NBr₃ is
107
Give the approximate bond angle for a molecule with a tetrahedral shape.
109.5°
Give the number of pairs of valence electrons for BF₃
12
Give the approximate bond angle for a molecule with a linear shape.
180°
Determine the correct molecular geometry (from left to right) about each interior atom in CH₃CH₂NH₂
1st C tetrahedral; 2nd C tetrahedral; N trigonal pyramidal
How many lone pairs are on the central atom of BrF₃
2
How many of the following molecules are polar? XeO₂, SiCl₂Br₂, C₂Cl₂, SeCl₆
2
The Lewis structure of sulfuric acid contains 4 double bonds, and two single bonds. 6 single bonds and 4 lone pairs. 2 double bonds and 4 single bonds. 2 double bonds, 4 single bonds, and 8 lone pairs. 2 double bonds, 4 single bonds, and 4 lone pairs.
2 double bonds, 4 single bonds, and 8 lone pairs.
Of the molecules AlCl₃ and AlBr₃, which has bonds that are more polar?
AlCl₃
Choose the compound below that should have the highest melting point according to the ionic bonding model. AlN MgO CaS RbI NaCl
AlN
Identify the compound with atoms that have an incomplete octet. ICl₅ BF₃ CO₂ Cl₂ CCl₄
BF₃
Choose the substance with the lowest viscosity. AsBr₅ BeBr₂ SbBr₃ OBr₂
BeBr₂
Determine the molecular geometry about interior oxygen atom in CH₃OCH₃
Bent
Determine the molecular geometry about interior oxygen atom in CH₃OH
Bent
Which of the following elements can form compounds with an expanded octet? Br Be F C
Br
Which molecule or compound below contains a pure covalent bond? NaCl Br₂ PCl₃ SCl₆ Li₂ CO₃
Br₂
Choose the compound below that contains at least one polar covalent bond, but is nonpolar ICl₃ CCl₄ SeF₄ HCN
CCl₄
List the compounds in decreasing boiling point order. CH₃OCH₃ Rn CH₃CHO
CH₃CHO>CH₃OCH₃>Rn
Identify the compound that does not have dipole-dipole forces as its strongest force. CO₂ CH₃OCH₃ CH2F₂ CH₂F HCCl₃
CO₂
Place the following in order of decreasing magnitude of lattice energy. KF CaS RbI
CaS > KF > RbI
Choose the molecule or compound that exhibits dispersion forces as its strongest intermolecular force. Cl₂ NaCl HBr CO
Cl₂
Which set of compounds is arranged in order of increasing magnitude of lattice energy?
CsBrCsBr < KFKF < CaO
What is the strongest type of intermolecular force present in F₂
Dispersion
How do you determine whether a molecule is polar?
Draw the Lewis structure for the molecule and determine the molecular geometry. Determine whether the molecule contains polar bonds. Determine whether the polar bonds add together to form a net dipole moment.
In the molecule FBr, which atom is the negative pole?
F
Based on the expected intermolecular forces, which halogen has the lowest boiling point? F₂ Cl₂ I₂ Br₂
F₂
Draw the molecular orbital diagram shown to determine which of the following is paramagnetic. F₂²⁺ Ne₂²⁺ O₂²⁺ O₂²⁻ None of the above are paramagnetic.
F₂²⁺
Which of the following compounds exhibits dipole-dipole forces as its strongest attraction between molecules? CH₃NH₂ H₂ CO₂ Kr HBr
HBr
Identify the compound with the lowest magnitude of lattice energy. BaO KCl SrO KBr
KBr
List the following compounds in decreasing electronegativity difference. Cl₂ HCl KCl
KCl > HCl > Cl₂
Which of the following ionic compounds would be expected to have the highest lattice energy? LiF LiBr LiI LiCl
LiF
Place the following in order of increasing magnitude of lattice energy. MgO CaS Lil
LiI < Ca S < MgO
What are the main properties of liquids (in contrast to gases and solids)?
Liquids have a definite volume. Liquids have much higher densities in comparison to gases. Liquids are not easily compressed. Liquids have an indefinite shape and assume the shape of their container.
Choose the compound below that should have the highest melting point according to the ionic bonding model. SrI₂ SrBr₂ CaCl₂ SrF₂ MgF₂
MgF₂
Which substance experiences dipole-dipole forces? CCl₄ NF₃ CS₂ BH₃
NF₃
Which of the following compounds has the highest boiling point? F₂ NaF HF ClF
NaF
Apply molecular orbital theory to predict which species has the strongest bond N₂ N₂⁻ N₂⁺
N₂
Place the following compounds in order of increasing boiling point. LiF N₂ NH₂CH₃
N₂<NH₂CH₃<LiF
Place the following in order of increasing F-A-F bond angle, where A represents the central atom in each molecule. PF₃ OF₂ PF₄⁺
OF₂ < PF₃ < PF₄⁺
What is the molecular geometry of TeF₄
Seesaw
What are the main properties of solids (in contrast to liquids and gases)?
Solids may be crystalline (ordered) or amorphous (disordered). Solids are not easily compressed. Solids have a definite shape and do not assume the shape of their container. Solids have definite volumes
Place the following in order of increasing magnitude of lattice energy. CaO MgO SrS
SrS < CaO < MgO
Draw the Lewis structure for NO₂⁻including any valid resonance structures. Which of the following statements is TRUE? The nitrite ion contains one N−O single bond and one N=O double bond. The nitrite ion contains two N=O double bonds. The nitrite ion contains two N−O single bonds. The nitrite ion contains two N−O bonds that are equivalent to 1 1/2 bonds. None of the above are true.
The nitrite ion contains two N−ON−O bonds that are equivalent to 1 1/2 bonds.
A glass capillary is placed in a bowl of water. Into what type of capillary will the water rise to the highest level, measured vertically from the surface of the water a 1-mm wide capillary inserted vertically into the water a 1.5-mm capillary inserted at 45 degrees into the water a 1.5-mm capillary inserted vertically into the water a 2-mm capillary inserted at 30 degrees into the water
a 1-mm wide capillary inserted vertically into the water
Capillary action occurs because
adhesive forces are greater than cohesive forces.
Describe a sigma bond
an attraction due to overlap of two orbitals along the internuclear axis
All four of the silicon-chlorine single bonds in SiCl₄ are polar. In which direction should the polarity arrows point?
away from the central silicon atom
Determine the molecular geometry about interior oxygen atom in H₂O₂
bent
What type(s) of intermolecular force is/are exhibited by sulfur dioxide, SO₂
both dipole-dipole forces and dispersion forces
Which pair of elements is most likely to form an ionic bond? sulfur and oxygen carbon and hydrogen nitrogen and oxygen calcium and chlorine
calcium and chlorine
Carbon monoxide (CO) is used as a purifying gas in Mond's process to produce nickel from its ores. What type of bonding occurs between the atoms of a CO molecule?
covalent
Identify the substance with the highest viscosity.
diesel maple syrup soda motor oil water
Give the electron geometry (eg), molecular geometry (mg), and hybridization for NCl₃
eg = tetrahedral, mg = trigonal pyramidal, sp³
Determine the electron geometry, molecular geometry and polarity of N₂O (N central)
eg= linear, mg=linear, polar
Determine the electron geometry (eg) and molecular geometry (mg) of the underlined carbon in CH₃CN
eg=linear, mg=linear
What type of bonding occurs in a sample of pure copper, Cu? In other words, how is one copper atom held to another copper atom?
metallic
Determine the molecular geometry of SCl₆
octahedral
Using the VSEPR model, the electron-domain geometry of the central atom in BrF₄⁻ is
octahedral
Determine the molecular geometry of IF₄⁺
seesaw
Determine the hybridization about beryllium in BeBr₂
sp
Which hybridization scheme occurs about phosphorus when phosphorus forms a triple bond?
sp
the correct hybridization for the central atom based on the electron geometry CO₂
sp
the correct hybridization for the central atom based on the electron geometry HCN
sp
Identify the hybridization for the carbons in benzene, C₆H₆
sp²
the correct hybridization for the central atom based on the electron geometry CCl₄
sp³
the correct hybridization for the central atom based on the electron geometry NH₃
sp³
the correct hybridization for the central atom based on the electron geometry OF₂
sp³
the correct hybridization for the central atom based on the electron geometry SO₃²⁻
sp³
Determine the hybridization about bromine in BrF₃
sp³d
Which hybridization schemes allows the central atom to form more than four bonds?
sp³d
the correct hybridization for the central atom based on the electron geometry BrF₃
sp³d²
the correct hybridization for the central atom based on the electron geometry PF₆⁻
sp³d²
What shape would you expect for XeF₄
square planar
Determine the molecular geometry of BrF₅
square pyramidal
Which choice is not true of a liquid in a glass capillary with a convex meniscus? The liquid has strong cohesive forces. The liquid level will be lower inside the capillary when a capillary is inserted into a bowl of the liquid. The liquid will have a convex meniscus as it moves in the capillary. The behavior of the liquid is driven by strong interactions with the capillary glass.
the behavior of the liquid is driven by strong interactions with the capillary glass.
Determine the molecular geometry of PF₅
trigonal bipyramidal
