1) the heat of vaporization of a material is ___________ a) associated with the
ID: 1021536 • Letter: 1
Question
1) the heat of vaporization of a material is ___________
a) associated with the energy required for the substance to melt
b) associated with the energy required to boil the substance
c) numerically equal to the substances heat of fusion
d) just something made up to confuse students
2) 20 cm3= _____ ml
a) 20
b) 2.7
c) 0.050
d) none correct
3) deposition would be
a) an exothermic physical change
b) an endothermic physical change
c) an exothermic chemical reaction
d) an endothermic chemical reaction
4) 1 atom of gold weighs
a) 197.0 g
b) 79 g
c) 79 amu
d) 197.0 amu
5) which of the following compounds would be expected to have dipolar forces between its molecules
a) C2H6
b) CS2
c) CO2
d) none
6) molar mass of CO2
a) 44.01 g/mol
b) 44.01 g
c) 44.01 amu
d) all correct
Explanation / Answer
Q.1: Heat of vaporization of a material is the energy required to evaporate or boil a substance. Hence option (b) is correct.
Q.2: 1 cm3 = 1 mL
Hence 20 cm3 = 20 mL
Hence option (a) is correct.
Q.3: During deposition heat is released. Hence deposition is an exothermic physical change. Hence option (a) is correct.
Q.4: The atomic mass gold(Au) is 197.0 g/mol
Hence 1 atom of gold weighs 197.0 amu
Hence option (d) is correct.
Q.5: Since all of the given molecules are nonpolar, non of the molecules has dipolar force.
Q.6: Molar mass of CO2 is 44.01 g/mol.
Hence option (a) is correct.
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