13. The density of the solid phase of a substance is 0.9 g/cm³ and the density of the liquid phase is 1.0 g/cm³. A large increase in pressure will (A) Lower the freezing point. (B) Raise the freezing point. (C) Lower the boiling point. (D) Raise the triple point. (E) Lower the triple point.

7. The elementary chemical reaction O + ClO → Cl + O2 is made pseudo-first order in oxygen atoms by using a large excess of ClO radicals. The rate constant for the reaction is 3.5 × 10⁻¹¹ cm³/molecule·s. If the initial concentration of ClO is 1.0 × 10¹¹ molecules/cm³, how long will it take for the oxygen atoms to decrease to 10.% of their initial concentration? (A) 3.2 × 10⁻³ s (B) 0.66 s (C) 0.017 s (D) 23 s (E) 2.4 s

13. The density of the solid phase of a substance is 0.9 g/cm³ and the density of the liquid phase is 1.0 g/cm³. A large increase in pressure will
(A) Lower the freezing point.
(B) Raise the freezing point.
(C) Lower the boiling point.
(D) Raise the triple point.
(E) Lower the triple point.

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