Chemistry Test 2
For the elements Cs, F, and Cl, the order of increasing electronegativity is
Cs<Cl<F
In which pair do both compounds exhibit predominantly ionic bonding? a. PCl₃ b. Na₂SO₃ c. KI and O₃ d. BaF₂ and H₂O e. CsCl and MgO
CsCl and MgO
Which of the following molecules contains the shortest C-C bond?
C₂H₂
Which of the following does not contain at least one pi bond?
C₂H₆
True or False: A nonpolar covalent bond results from the unequal sharing of a pair of electrons between atoms in a molecule.
False
True or False: When a metal reacts with a nonmetal a covalent bond is formed.
False, an ionic bond is formed.
Which of the following molecules has a nonlinear structure?
O₃
Lewis structure for acetone, CH₃COH₃
Refer to internet
Which of the following molecules contains a central atom with sp² hybridization?
Refer to paper
Which of the following is not a valid resonance structure for N₃⁻?
Refer to paper answer is a.
Which of the following has a dipole moment?
SO₂
Which of the following bonds would be the most polar without being considered ionic? a. Mg-O b. C-O c. O-O d. Si-O e. N-O
Si-O
As the bond order of a bond increases, the bond energy _____ and the bond length _____.
increase; decreases
The force between two bodies having identical electric charges
is a force of repulsion
In the cyanide ion (CN⁻), the nitrogen has a formal charge of a. -2 b. -1 c. 0 d. 2 e. More info needed
c. 0
Which of the following pairs is incorrect? a. NH₄Br, ammonium bromide b. K₂CO₃, potassium carbonate c. BaPO₄, barium phosphate d. CuCl, copper (I) chloride e. MnO₂, manganese (IV) oxide
c. BaPO₄ Should be Ba₃(PO₄)₂
Which of the following is incorrectly named? a. SO₃²-, sulfite ion b. C₂O₄²⁻, oxalate ion c. PO₄³⁻, phosphate ion d. ClO₃⁻, chlorite ion e. CN⁻, cyanide ion
d. ClO³⁻ Should be named chlorAte ion
All of the following are in aqueous solution. Which is incorrectly named? a. H₂SO₄, sulfuric acid b. H₂CO₃, carbonic acid c. H₃PO₄, phosphoric acid d. HCN, cyanic acid e. HCl, hydrochloric acid
d. HCN Should be named hydrocyanic acid
Which of the following exhibits resonance? a. BH₃ b. SCl₆ c. H₂O d. NO₂ e. At least two of the molecules (A-D) exhibit resonance
d. NO₂
Trigonal bipyramidal hybridization
dsp³ or sp³d
Octahedral hybridization
d²sp³ or sp³d²
Which of the following is incorrectly named? a. Pb (NO₃)₂, lead (II) nitrate b. NH₄ClO₄, ammonium perchlorate c. PO₄³-, phosphate ion d. Mg(OH)₂, magnesium hydroxide e. NO³-, nitrite ion
e. NO³- NitrAte ion
The molecular structure of BrF₆ is:
octahedral
Molecular structure of NCl₃
pyramidal
The molecular structure of NCl₃ is:
pyramidal
molecular structure of SOCl₂
pyramidal
Linear structure hybridization
sp
Trigonal planer hybridization
sp²
What is the hybridization of the carbon atom that is double-bonded to oxygen?
sp²
Give the hybridization for the O in OF₂
sp³
Tetrahedral hybridization
sp³
What is the hybridization of the carbon atom that is bonded to chlorine?
sp³
The molecular structure of BeF₃⁻ is:
trigonal planar
Which of the following types of molecules always has a dipole moment?
trigonal pyramid molecules (three identical bonds)
How many of the atoms are sp hybridized in tetracyanoethylene?{
8
The electron configuration of a particular diatomic species is (refer to paper). What is the bond order for this species?
0.5
The bond angle of H₂SE?
109°
Lewis structure has _ sigma bonds and _ pi bonds.
13, 3
How many of the following molecules possess dipole moments?
2
Cl₂ bond energy= 239 kJ/mol F₂ bond energy= 154 kJ/mol 1/2 Cl₂ (g) + 3/2F₂ (g)→ClF₃ ∆H°= -409 kJ/mol
253 kJ/mol
Number of bonds between two carbon atoms increases, which one decreases?
Bond length
The formula for calcium bisulfate is:
Ca (HSO₄)₂
The formula for potassium dihydrogen phosphate is:
KH₂PO₄
Which of the following has the smallest radius?
Mg²⁺
Which of the following has an incomplete octet in its Lewis structure? a. SO₂ b. ICl c. CO₂ d. F₂ e. NO
NO
Is Aluminim (III) Oxide correct?
No
Is Phosphorus pentoxide, P2O5 correct?
No
Choose the statement that best describes the PbCl₄ molecule in the gas phase?
The bond angles are all about 109°.
Consider the following Lewis structure:
answer is (A) Refer to paper, #28
The molecular structure of OF₂ is:
bent
