18. Which of the following four molecules are polar: PH3, OF2, HF, SO,? (a) all except SO, (b) only HF (c) only HF and OF2 (d) none of them (e) all of them 19. The perchloric acid (HCIO,) molecule contains: (a) 13 lone pairs, 1 a bond, and 4 o bonds. (c) 8 lone pairs, 3 n bonds, and 5 o bonds. (e) 11 lone pairs, no a bonds, and 5 o bonds. (b) 9 lone pairs, no a bonds, and 6 o bonds. (d) 2 lone pairs, 3 n bonds, and 4 o bonds.
18. Which of the following four molecules are polar: PH3, OF2, HF, SO,? (a) all except SO, (b) only HF (c) only HF and OF2 (d) none of them (e) all of them 19. The perchloric acid (HCIO,) molecule contains: (a) 13 lone pairs, 1 a bond, and 4 o bonds. (c) 8 lone pairs, 3 n bonds, and 5 o bonds. (e) 11 lone pairs, no a bonds, and 5 o bonds. (b) 9 lone pairs, no a bonds, and 6 o bonds. (d) 2 lone pairs, 3 n bonds, and 4 o bonds.
Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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general chemistry , please solve question 18 and 19
![1A.Asimate the but of roaction (A0 at 208 K Ror the reaction shown, given the average bond enorgies below.
Brg)+3F(g)-Bel(g)
he bond cnergies of Br-Br 192 kmol, F-F 158 K/mol, Br-F-197 kimol]
(b)-410 kJ
(e)-611 kJ
(d)-665 kJ
(e)-720 kJ
13. Which one of the following violates the octet rule?
(a) PCh
(b) CBra
(e) NF
(d) OF
(e) PCls
14. The correct Lewis structure for nitrogen trichloride has:
(a) 3 N-CI bonds and a total of 10 lone pairs of electrons.
(b) 3 N-CI bonds and a total of 6 lone pairs of elecetrons.
(e)I N-CI bond, 2 N-Cl bonds and 7 and a total of lone pairs of electrons,
(d) 2 N-CI bonds, 1 N-CI bond and a total of 8 lone pairs of electrons.
(e) 3 N-CI bonds and a total of 9 lone pairs of electrons.
15. Consider hydrogen carbonate ion (HCO,). After drawing the correct Lewis structure(s), you would see:
(b) three single bonds around the central carbon atom,
(a) two double bonds around the central carbon atom.
(c) four single bonds around the central carbon atom.
(d) two equivalent resonance forms.
(e) three equivalent resonance forms.
16. Which of these isoelectronic species has the smallest radius?
(b) Sr*
(c) Rb*
(d) Se
(a) Br
(e) They are all the same radius because they have the same number of electrons,
17. A neutral molecule having the general formula AB, has one lone pairs of electrons on A. What is the hybridization
of A?
(b) sp
(c) sp'
(d) sp'd
(e) sp'd
(a) sp
18. Which of the following four molecules are polar: PH3, OF2, HF, SO,?
(a) all except SO;
(b) only HF
(c) only HF and OF2
(d) none of them
(e) all of them
19. The perchloric acid (HCIO,) molecule contains:
(a) 13 lone pairs, 1a bond, and 4 a bonds.
(c) 8 lone pairs, 3 n bonds, and 5 o bonds.
(e) 11 lone pairs, no a bonds, and 5 o bonds.
(b) 9 lone pairs, no z bonds, and 6 o bonds.
(d) 2 lone pairs, 3 n bonds, and 4 o bonds.
20. Which of the following molecular geometries is WRONG?
(a) NF3 - trigonal planar
(d) AsFs - trigonal bipyramidal
(c) BF, - trigonal planar
(b) H2O-bent
(e) SeF. - octahedral
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Transcribed Image Text:1A.Asimate the but of roaction (A0 at 208 K Ror the reaction shown, given the average bond enorgies below.
Brg)+3F(g)-Bel(g)
he bond cnergies of Br-Br 192 kmol, F-F 158 K/mol, Br-F-197 kimol]
(b)-410 kJ
(e)-611 kJ
(d)-665 kJ
(e)-720 kJ
13. Which one of the following violates the octet rule?
(a) PCh
(b) CBra
(e) NF
(d) OF
(e) PCls
14. The correct Lewis structure for nitrogen trichloride has:
(a) 3 N-CI bonds and a total of 10 lone pairs of electrons.
(b) 3 N-CI bonds and a total of 6 lone pairs of elecetrons.
(e)I N-CI bond, 2 N-Cl bonds and 7 and a total of lone pairs of electrons,
(d) 2 N-CI bonds, 1 N-CI bond and a total of 8 lone pairs of electrons.
(e) 3 N-CI bonds and a total of 9 lone pairs of electrons.
15. Consider hydrogen carbonate ion (HCO,). After drawing the correct Lewis structure(s), you would see:
(b) three single bonds around the central carbon atom,
(a) two double bonds around the central carbon atom.
(c) four single bonds around the central carbon atom.
(d) two equivalent resonance forms.
(e) three equivalent resonance forms.
16. Which of these isoelectronic species has the smallest radius?
(b) Sr*
(c) Rb*
(d) Se
(a) Br
(e) They are all the same radius because they have the same number of electrons,
17. A neutral molecule having the general formula AB, has one lone pairs of electrons on A. What is the hybridization
of A?
(b) sp
(c) sp'
(d) sp'd
(e) sp'd
(a) sp
18. Which of the following four molecules are polar: PH3, OF2, HF, SO,?
(a) all except SO;
(b) only HF
(c) only HF and OF2
(d) none of them
(e) all of them
19. The perchloric acid (HCIO,) molecule contains:
(a) 13 lone pairs, 1a bond, and 4 a bonds.
(c) 8 lone pairs, 3 n bonds, and 5 o bonds.
(e) 11 lone pairs, no a bonds, and 5 o bonds.
(b) 9 lone pairs, no z bonds, and 6 o bonds.
(d) 2 lone pairs, 3 n bonds, and 4 o bonds.
20. Which of the following molecular geometries is WRONG?
(a) NF3 - trigonal planar
(d) AsFs - trigonal bipyramidal
(c) BF, - trigonal planar
(b) H2O-bent
(e) SeF. - octahedral
2
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