Chem 1211 Final Exam Review
Questions and 100%verified Answers
2025/2026
The central atom in ________ does NOT violate the octet rule.
A) SF4
B) KrF2
C) CF4
D) XeF4
E) ICl4- - ANSWER-C) CF4
Given the average bond energies for C-H and C-Br bonds are 413 and 267 kJ/mol,
respectively, the heat of atomization of bromoform (CHBr3) is _________ kJ/mol.
A) 1241
B) 689
C) -689
D) 1378
E) -1378 - ANSWER-A) 1241
C-H=413
C-Br=276
*3
= 828
828 + 413 = 1241
Of the bonds C-C, C--C, C---C, the C-C bond is ___________.
A) strongest/shortest
B) strongest/longest
C) weakest/longest
D) weakest/shortest
E) intermediate in both strength and length - ANSWER-C) weakest/longest
The halogens, alkali metals, and alkaline earth metals have _______ valence electrons,
respectively.
A) 7, 4, and 6
B) 1, 5, and 7
C) 8, 2, and 3
D) 7, 1, and 2
E) 2, 7, and 4 - ANSWER-D) 7,1, and 2
, They type of compound that is most likely to contain a covalent bond is
_______________________.
A) one that is composed of a metal form the far left of the periodic table and a nonmetal
from the far right of the periodic table.
B) a solid metal
C) one that is composed of only nonmetals
D) held together by the electrostatic forces between oppositely charged ions.
E) there is no general rule to predict covalency in bonds. - ANSWER-C) one that is
composed of only non metals.
In which of the molecules below is the carbon-carbon distance the shortest?
A) H2C--CH2
B) H-C---C-H
C) H3C-CH3
D) H2C--C--CH2
E) H3C-CH2-CH3 - ANSWER-B) H-C---C-H
The Lewis Structure of N2H2 shows__________________.
A) a nitrogen-nitrogen triple bond
B) a nitrogen-nitrogen single bond
C) each nitrogen has one nonbonding electron pair
D) each nitrogen has two nonbonding electron pairs
E) each hydrogen has one nonbonding electron pair - ANSWER-C) each nitrogen has
one nonbonding electron pair
The oxidation number of iron is Fe2O3 is ______________.
A) -2
B) +1
C) +3
D) +2
E) -3 - ANSWER-C) +3
The formal charge on sulfur is SO4-2 is _________, where the Lewis structure of the
iron is:
A) -2
B) 0
C) +2
D) +4
E) -4 - ANSWER-B) 0
The Lewis Structrue of CO3-2 iron is ________________. - ANSWER-
A valid Lewis Structure of _________ cannot be drawn without violating the octet rule.
A) NF3
B) IF3
C) PF3
Questions and 100%verified Answers
2025/2026
The central atom in ________ does NOT violate the octet rule.
A) SF4
B) KrF2
C) CF4
D) XeF4
E) ICl4- - ANSWER-C) CF4
Given the average bond energies for C-H and C-Br bonds are 413 and 267 kJ/mol,
respectively, the heat of atomization of bromoform (CHBr3) is _________ kJ/mol.
A) 1241
B) 689
C) -689
D) 1378
E) -1378 - ANSWER-A) 1241
C-H=413
C-Br=276
*3
= 828
828 + 413 = 1241
Of the bonds C-C, C--C, C---C, the C-C bond is ___________.
A) strongest/shortest
B) strongest/longest
C) weakest/longest
D) weakest/shortest
E) intermediate in both strength and length - ANSWER-C) weakest/longest
The halogens, alkali metals, and alkaline earth metals have _______ valence electrons,
respectively.
A) 7, 4, and 6
B) 1, 5, and 7
C) 8, 2, and 3
D) 7, 1, and 2
E) 2, 7, and 4 - ANSWER-D) 7,1, and 2
, They type of compound that is most likely to contain a covalent bond is
_______________________.
A) one that is composed of a metal form the far left of the periodic table and a nonmetal
from the far right of the periodic table.
B) a solid metal
C) one that is composed of only nonmetals
D) held together by the electrostatic forces between oppositely charged ions.
E) there is no general rule to predict covalency in bonds. - ANSWER-C) one that is
composed of only non metals.
In which of the molecules below is the carbon-carbon distance the shortest?
A) H2C--CH2
B) H-C---C-H
C) H3C-CH3
D) H2C--C--CH2
E) H3C-CH2-CH3 - ANSWER-B) H-C---C-H
The Lewis Structure of N2H2 shows__________________.
A) a nitrogen-nitrogen triple bond
B) a nitrogen-nitrogen single bond
C) each nitrogen has one nonbonding electron pair
D) each nitrogen has two nonbonding electron pairs
E) each hydrogen has one nonbonding electron pair - ANSWER-C) each nitrogen has
one nonbonding electron pair
The oxidation number of iron is Fe2O3 is ______________.
A) -2
B) +1
C) +3
D) +2
E) -3 - ANSWER-C) +3
The formal charge on sulfur is SO4-2 is _________, where the Lewis structure of the
iron is:
A) -2
B) 0
C) +2
D) +4
E) -4 - ANSWER-B) 0
The Lewis Structrue of CO3-2 iron is ________________. - ANSWER-
A valid Lewis Structure of _________ cannot be drawn without violating the octet rule.
A) NF3
B) IF3
C) PF3
