E-PolyLearning

486. Molecular solids need a very lower temperature to break weak
a. intermolecular forces
b. dipole-forces
c. hydrogen bonding
d. none of above
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Answer: (a).intermolecular forces

487. The change from liquid in to the gaseous state is known as
a. vaporization
b. condensation
c. freezing
d. sublimation
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Answer: (a).vaporization

488. The enthalpy change of vaporization is the energy required to change 1 mol of liquid in to 1 mol of
a. solid
b. gas
c. molten
d. vapor
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Answer: (b).gas

489. The silicon (IV) oxide which is found in mineral quartz is very similar to
a. graphite
b. diamond
c. iron
d. copper
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Answer: (b).diamond

490. The metal which can be melted even by the warmth of human palm is
a. gallium
b. indium
c. aluminum
d. tungsten
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Answer: (a).gallium