Liquids and Solids
是非題
(1)
(2)
( ) The vapor pressure of CH3SH(l) is larger than that of CH3OH(l).
( ) The bonding forces that hold the atoms of a molecule together are called
intermolecular forces.
( ) The forces that exist among noble gas atoms and nonpolar molecules are
called London dispersion forces.
( ) The bonding in most metals is strong and nondirectional.
( ) Brass is an interstitial alloy.
( ) Changes of state from solid to liquid and from liquid to gas are chemical
(3)
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changes.
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選擇題
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(10) ( )
Which compound has the lowest boiling point? (A) H2O (B) H2S (C)
H2Se (D) H2Te
Which is an interstitial alloy? (A) brass (B) pewter (C) steel (D) sterling
silver.
Predict which substance in the following will show the largest vapor
pressure at a given temperature. (A) H2O (B) CH3OH (C)
HOCH2CH2OH (D) CH3CH2CH2CH2OH
The molecules of I2 attract each other by (A) dipole-dipole force (B)
hydrogen bonding (C) ionic bonding (D) London dispersion force.
The molecules of S8 attract each other by (A) dipole-dipole force (B)
hydrogen bonding (C) ionic bonding (D) London dispersion force.
Which is false? (A) An alloy has metallic properties. (B) Steel is an
interstitial alloy. (C) Brass is a substitutional alloy. (D) None of these
For ice, the molar heat of fusion is (A) 1.44 (B) 6.02 (C) 80 (D) 539
KJ/mol.
For water, the molar heat of vaporization is (A) 40.6 (B) 539 (C) 9.7 (D)
4.18 KJ/mol at 100oC.
Which is true? (A) The molar heat of vaporization of water is 6.02
kJ/mol. (B) The molar heat of fusion of water is 40.6 kJ/mol. (C) The
specific heat capacity of liquid water is 4.18 kJ/goC. (D) none of these.
Crystalline Si is a(n) (A) covalent (B) ionic (C) molecular (D) metallic
solid
(11) ( )
Which is true? (A) An alloy has metallic properties. (B) Steel is an
interstitial alloy. (C) Brass is a substitutional alloy. (D) all of these.
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問答、計算題
(1)
Identify the most important types of interparticle forces present in the solids of
each of the following substances：(a) CaCl2 (b) NH3 (c) NO (d) BF3
(2)
Calculate the energy (in KJ) required to heat 25 g of liquid water from 25oC to
100. oC and change it to steam at 100. oC. The specific heat capacity of liquid
water is 4.18 J/goC, and the molar heat of vaporization of water is 40.6 kJ/mol.
(3)
(a) Phase A is (A) gas (B) liquid (C) solid (D) supercritical fluid.
(b) Point G is called (A) boiling point (B) critical point (C) melting point (D)
triple point.
(1)
(a) CaCl2: ionic bonds
(b) NH3: London dispersion force and hydrogen bonding
(c) NO: London dispersion force and dipole-dipole force
(d) BF3: London dispersion force
(2)
65 kJ
(3)
(a) A
(b) B