Question

The normal boiling point of ammonia, $\mathrm{NH}_{3}$, is $-33^{\circ} \mathrm{C}$, and its freezing point is $-78^{\circ} \mathrm{C}$. Fill in the blanks. (a) At STP $\left(0^{\circ} \mathrm{C}, 1\right.$ atm pressure $), \mathrm{NH}_{3}$ is a __ (b) If the temperature drops to $-40^{\circ} \mathrm{C}$, the ammonia will and become a(c) If the temperature drops further to $-80^{\circ} \mathrm{C}$ and the molecules arrange themselves in an orderly pattern, the ammonia will and become a _. (d) If crystals of ammonia are left on the planet Mars at a temperature of $-100^{\circ} \mathrm{C}$, they will gradually disappear by the process of and form a ________.

          The normal boiling point of ammonia, $\mathrm{NH}_{3}$, is $-33^{\circ} \mathrm{C}$, and its freezing point is $-78^{\circ} \mathrm{C}$. Fill in the blanks. (a) At STP $\left(0^{\circ} \mathrm{C}, 1\right.$ atm pressure $), \mathrm{NH}_{3}$ is a ________ 
(b) If the temperature drops to $-40^{\circ} \mathrm{C}$, the ammonia will and become a______(c) If the temperature drops further to $-80^{\circ} \mathrm{C}$ and the molecules arrange themselves in an orderly pattern, the ammonia will and become a _________. 
(d) If crystals of ammonia are left on the planet Mars at a temperature of $-100^{\circ} \mathrm{C}$, they will gradually disappear by the process of and form a ____________.

Added by Lourdes H.

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