Unit 4: Liquids and Solids

21. In which of the following states do substances have the least degree of molecular disorder?

a) Gas
b) Liquid
c) Solid
d) Plasma
Answer: c) Solid

22. The phenomenon where liquid molecules escape into the vapor phase at temperatures below the boiling point is called:

a) Boiling
b) Sublimation
c) Evaporation
d) Condensation
Answer: c) Evaporation

23. The ability of a liquid to resist flow is known as:

a) Surface tension
b) Viscosity
c) Capillarity
d) Density
Answer: b) Viscosity

24. Which type of solid has atoms or molecules held together by van der Waals forces?

a) Ionic solid
b) Covalent solid
c) Molecular solid
d) Metallic solid
Answer: c) Molecular solid

25. In which type of solid are the atoms or ions arranged in a regular, repeating pattern?

a) Amorphous
b) Crystalline
c) Polymeric
d) Metallic
Answer: b) Crystalline

26. The point at which the solid and liquid phases of a substance coexist in equilibrium is known as:

a) Melting point
b) Freezing point
c) Triple point
d) Boiling point
Answer: c) Triple point

27. Which property of liquids is responsible for the formation of a meniscus in a graduated cylinder?

a) Surface tension
b) Viscosity
c) Capillarity
d) Density
Answer: a) Surface tension

28. The process by which a solid changes directly into a gas is known as:

a) Condensation
b) Sublimation
c) Freezing
d) Melting
Answer: b) Sublimation

29. The process by which a gas changes directly into a solid is called:

a) Deposition
b) Condensation
c) Sublimation
d) Melting
Answer: a) Deposition

30. In which type of solid are electrons delocalized, allowing for high electrical conductivity?

a) Molecular solid
b) Ionic solid
c) Metallic solid
d) Covalent network solid
Answer: c) Metallic solid