Question

Which of the following factor(s) is (are) responsible for the change of state of solid carbon dioxide into vapors ?

• A. Increase in pressure
• B. Decrease in pressure
• C. Increase in temperature
• D. Decrease in temperature

Answer 1

Answer: (B), (C)

Increase in temperature

The explanation for correct option:
(B) Decrease in pressure

• Decrease in pressure allows the molecules to move far away from each other.
• So decrease in pressure allows the conversion of state from solid to gas.

(C) Increase in temperature

• Increasing the temperature increases the kinetic energy of molecules hence molecules moves far away from each other.
• So that increase in temperature converts the state from solid to gas.

The explanation for incorrect options:
(A) Increase in pressure

• Increase in pressure allows the molecules to stay close to each other.
• Hence the state cannot be changed from solid to gas by increasing the pressure.

(D) Decrease in temperature

• Decrease in temperature lowers down the kinetic energies of molecules so that they come close to each other.
• Decrease in temperature converts the state from gas to liquids.