Chem 1010 - General Chemistry 1 » Summer 2022 » Quiz 5

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Question #1
Which statement about covalent bonds is false?
A.   Covalent bonds are unreactive.
B.   Covalent bonds involve valence electrons.
C.   Covalent bonds form between non-metal atoms.
D.   Covalent bonds occur in molecular compounds.
Question #2
Which element will have five electrons in its Lewis symbol?
A.   sulfur
B.   Argon
C.   Boron
D.   Phospurus
Question #3
How many electrons will be in the correctly drawn Lewis Structure for CHCl3?
A.   14
B.   18
C.   10
D.   34
Question #4
Which of the following statements could not describe a covalent bond?
A.   The sharing of four electrons between two atoms
B.   The sharing of two or more electrons equally between two atoms
C.   The sharing of two or more electrons unequally between two atoms
D.   An electrostatic interaction between two oppositely charged ions
Question #5
Determine, in order, the number of valence electrons that must be considered for the three compounds CO2, CH3Cl, HCN
A.   4, 26, 14
B.   22, 26, 14
C.   10, 14, 14
D.   16, 14, 10
Question #6
How many unique molecules may have the formula C2H2ClBr?
A.   4
B.   5
C.   3
D.   2
Question #7
Which statement about cis and trans isomers is false?
A.   They have the same chemical formula.
B.   They have the same molecular weight.
C.   They occur in compounds containing triple bonds.
D.   They have different boiling points.
Question #8
Predict qualitatively the relative bond lengths of the four single bonds given below and arrange them from shortest to longest: C−C N−N O−O F−F
A.   O−O < N−N < F−F < C−C
B.   C−C < F−F < N−N < O−O
C.   N−N < O−O < F−F < C−C
D.   F−F < O−O < N−N < C−C
Question #9
Which of the following statements concerning bond energies is false?
A.   A multiple carbon-carbon bond takes less energy to break than a single carbon-carbon bond.
B.   A saturated alkane has carbon-carbon bonds with very similar bond energies.
C.   Bond energy calculations require no knowledge of the bond polarity but they do require a knowledge of the bond multiplicity and the average bond energy.
D.   The formation of a carbon-oxygen double bond yields more energy than the formation of a carbon-oxygen single bond.
Question #10
From the data given below, calculate the approximate enthalpy change for the reaction below. 2 CH3OH(g) + 3 O2(g) 2 CO2(g) + 4 H2O(g) bond enthalpy : kJ/mol C−H : 414 C−C : 347 C=C : 611 C−O : 351 C=O : 803 O−H : 463 O=O : 498 H−H : 436
A.   +1184 kJ
B.   −1310 kJ
C.   −904 kJ
D.   −2902 kJ

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