Which of the following statements is false?
A. Solid carbon dioxide is commonly referred to as “dry ice.”
B. Solid carbon dioxide turns directly into vapor at typical “room temperature and pressure” because the triple point temperature of carbon dioxide is greater than 293.15 K.
C. Solid carbon dioxide turns directly into vapor at typical “room temperature and pressure” because the triple point pressure of carbon dioxide is greater than 101.325 kPa.
D. There is no such thing as liquid carbon dioxide at normal ambient conditions.
E. Unlike water, carbon dioxide increases in density as it freezes.
A. Incorrect. This statement is true. Solid CO2is cold and has similar appearance to ice, but contains no water.
B. Correct. Referring to Table 2-1, the triple point temperature of carbon dioxide is actually 216 K (-57°C)! The statement is true, but the reason given is not.
C. Incorrect. This statement is true. Because room temperature conditions are below the triple point pressure, the liquid phase never occurs.
D. Incorrect. This statement is true. Liquid CO2 exists only above the triple point temperature AND pressure. Refer to Table 2-1 to see that the triple point temperature for carbon dioxide is over 5 MPa.
E. Incorrect. This statement is true. Water expands on freezing but almost all other substances contract on freezing.
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