The States of Matter – Multiple Choice Questions (MCQs)

1. 49. A phase diagram shows the relationship between temperature, pressure, and:

   • A. Phases of a substance
   • B. Volume
   • C. Density
   • D. Molar mass

2. 50. The triple point on a phase diagram represents:

   • A. The unique conditions where all three phases coexist in equilibrium
   • B. The boiling point
   • C. The melting point
   • D. The critical point

3. 51. Plasma is often referred to as the ______ state of matter.

   • A. Fourth
   • B. First
   • C. Second
   • D. Third