The sublimation and deposition point for carbon dioxide (CO) is recorded as -78.5°C. A chemist places a sample of solid carbon dioxide on a dish at room temperature (20°C). The chemist measures the temperature of the solid carbon dioxide over the next five minutes. At the end of the five minutes, a little bit of
solid carbon dioxide remains in the dish. What did the chemist discover about the temperature of the solid carbon dioxide during the five minute period?

A. The temperature rose.

B. The temperature fell.

C. The temperature fell, and then rose.

D. The temperature remained unchanged.

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Construct the hypothetical phase diagram for metals a and b between room temperature (20c) and 700c, given the following information: * the melting temperature of metal a is 480c. • the maximum solubility of b in a is 4 wt% b, which occurs at 420c. • the solubility of b in a at room temperature is 0 wt% b. • one eutectic occurs at 420c and 18 wt% b–82 wt% a. • a second eutectic occurs at 475c and 42 wt% b–58 wt% a. • the intermetallic compound ab exists at a composition of 30 wt% b–70 wt% a, and melts congruently at 525c.• the melting temperature of metal b is 600c. • the maximum solubility of a in b is 13 wt% a, which occurs at 475c. • the solubility of a in b at room temperature is 3 wt% a.

What problem would a person have if the nucleic acid in one of his or her cells were damaged?