apart making it less stable. 18. Which of the following would be expected to have the lowest vapor pressure at 25°C? (A) N2 (B) Cl2 (C) Br, (D) 2 llame a o bolrdhete od meo.0 ol o g mos La boanam

Chemistry
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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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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antaneous attractions than ethane,
cloud and more surface area available for
(C) Heptane's longer chain with more C-H bonds has more opportunities for hydrogen bonding to
form than ethane.
(D) Heptane has a carbon chain that is further apart making it less stable.
18. Which of the following would be expected to haye the lowest vapor pressure at 25°C?
(A) N2
(B) Cl,
(С) Br,
(D) I,
llame
19. In which of the following pairs of substances is the substance with the higher expected melting point
listed first?
(A) KCl or NaCl
(B) Mg or Al
(C) Ba or Cs
(D) Ar or Kr
boy
20. Which of the substances below would be expected to have the lowest boiling point at 1 atm pressure?
(A) (bent) F-O-F
(B) H-F
m) KO
O=0(
(D) [Li*][CH]
Combonue
21. Which factor(s) account for the observed difference in boiling points for the compounds below?
Compound
Ethane CH,CH3
Propane CH,CH,CH,
Boiling point
-89°C
-42°C
(A) stronger dipole-dipole attractions between propane molecules
(B) a larger number of covalent bonds within the propane molecule
a larger molar mass and more internal bonding in propane molecules
(D) a larger surface area and larger electron cloud in propane molecules
Transcribed Image Text:antaneous attractions than ethane, cloud and more surface area available for (C) Heptane's longer chain with more C-H bonds has more opportunities for hydrogen bonding to form than ethane. (D) Heptane has a carbon chain that is further apart making it less stable. 18. Which of the following would be expected to haye the lowest vapor pressure at 25°C? (A) N2 (B) Cl, (С) Br, (D) I, llame 19. In which of the following pairs of substances is the substance with the higher expected melting point listed first? (A) KCl or NaCl (B) Mg or Al (C) Ba or Cs (D) Ar or Kr boy 20. Which of the substances below would be expected to have the lowest boiling point at 1 atm pressure? (A) (bent) F-O-F (B) H-F m) KO O=0( (D) [Li*][CH] Combonue 21. Which factor(s) account for the observed difference in boiling points for the compounds below? Compound Ethane CH,CH3 Propane CH,CH,CH, Boiling point -89°C -42°C (A) stronger dipole-dipole attractions between propane molecules (B) a larger number of covalent bonds within the propane molecule a larger molar mass and more internal bonding in propane molecules (D) a larger surface area and larger electron cloud in propane molecules
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