A Certain Substance, X, Has a Triple-Point Temperature of 20°C

question 85

Multiple Choice

A certain substance, X, has a triple-point temperature of 20°C at a pressure of 2.0 atm. Which one of the following statements cannot possibly be true?

• A) X can exist as a liquid above 20°C.
• B) Both liquid and solid X have the same vapor pressure at 20°C.
• C) Liquid X can exist as a stable phase at 25°C, 1 atm.
• D) X can exist as a solid above 20°C.
• E) All of these statements could be true.

---

Definitions:

Social Class

A system of dividing society into different levels based on economic, professional, or educational status.

Communication

The act or process of using words, sounds, signs, or behaviors to express or exchange information or to express ideas, thoughts, feelings, etc., to someone else.

Contact Hypothesis

A theory suggesting that under appropriate conditions interpersonal contact is one of the most effective ways to reduce prejudice between majority and minority group members.

Ethnocentrism

The belief in the inherent superiority of one's own ethnic group or culture, often accompanied by prejudice against other groups.