Chem 1025 Exam Multiple Choice Periodic Table Bonding And Enthalpy
ADVERTISEMENT
1
2Form Code B
CHEM 1025 Exam # 4
6 April 2010
Instructions: On your scantron sheet enter your name, UF ID number, and Form Code (start with the first space and leave
the last space blank). This exam consists of 25 multiple choice questions each worth 8.0 points for a total maximum of
200 pts. Keep your exam sheet (mark your answers on it and on the scantron sheet). Turn in only the scantron. Any
bubbling error will count as an incorrect response, including wrong form code and answers.
1. Arrange the following bands in order of decreasing bond polarity:
P-S, C-O, F-F, C-F, Na-F
(1) Na-F > C-F > C-O > P-S > F-F
(2) F-F > C-O > C-F > P-S > Na-F
(3) F-F > P-S > C-O > C-F > Na-F
(4) Na-F > C-O > P-S > C-F > F-F
(5) P-S > Na-F > C-O > C-F > F-F
Determine the bond energy of a H-Cl bond given the following information.
2.
C-H(g) + Cl-Cl(g) → H
∆H
o
H
C-Cl(g) + H-Cl(g)
= -113 kJ
3
3
rxn
Bond
Bond Energy (kJ/mol)
Cl-Cl
243
C-Cl
339
H-C
414
(1) -1109 kJ/mol
(2) 883 kJ/mol
(3) -623 kJ/mol
(4) 55 kJ/mol
(5) 431 kJ/mol
3. Which of the following is True?
(1) A double covalent bond has 2 electrons
(2) As bonds get longer, they also get stronger
(3) Molecules can not exist with an odd number of electrons
(4) All metals are solid at room temperature
(5) Resonance structures must have the same total formal charge
O(g) → 4H
4. Calculate the ∆H
CH
(g) + 2 H
(g) + CO
(g)
for this reaction using the given bond energies:
4
2
2
2
rxn
Bond
Bond Energy (kJ/mol)
H-H
436
O-H
464
H-C
414
C=O
799
(1) -357 kJ
(2) +170 kJ
(3) -170 kJ
(4) +357 kJ
(5) -2110 kJ
How many total electrons surround the central atom in XeF
?
5.
2
(1) 6
(2) 8
(3) 10
(4) 12
(5) 14
6. The potential energy of two charged particles depends on:
I. Magnitude of the charges
II. Sign of the charges III. Distance between the charges
(1) I only
(2) II only
(3) III only
(4) I and III only
(5) I, II, and III
7. Breaking bonds
, while forming bonds
.
(1) requires no energy; requires no energy
(2) releases energy; requires energy
(3) releases energy; releases energy
(4) requires energy; releases energy
(5) requires energy; requires energy
8. Which of the following has the stronger carbon-carbon bond:
HCCH
H
CCH
H
CCH
2
2
3
3
(1) HCCH
(2) H
CCH
(3) H
CCH
(4) All of their carbon-carbon bonds are of equal strength
2
2
3
3
(5) Not enough information
9. Arrange the following atoms in order of increasing electronegativity: P, F, Cs, Ga, K
(1) Cs < P < K < Ga < F
(2) F < K < P < Ga < Cs
(3) Cs < Ga < P < K < F
(4) F < P < Ga < K < Cs
(5) Cs < K < Ga < P < F
10. Which of the following is False?
(1) Ionic bonds have an electrostatic attraction
(2) Chemical bonds form because the resulting molecule is at higher potential energy
(3) Noble gases are the least reactive group of elements
(4) Ionic bonds form by the interaction of a nonmetal and a metal
(5) Covalent molecules have low melting and boiling points
11. To which of the following does the octet rule apply?
-
(1) SF
(2) Helium
(3) BCl
(4) CN
(5) Lithium
4
3
ADVERTISEMENT
0 votes
Related Articles
Related forms
Related Categories
Parent category: Education