Sodium metal reacts with water to produce hydrogen gas. What best describes this reaction? (4 points)
a) A single replacement reaction takes place because sodium is less reactive than hydroxide ions.
b) A double replacement reaction takes place because sodium is less reactive than hydroxide ions.
c) A double replacement reaction takes place because sodium is more reactive than hydrogen.
d) A single replacement reaction takes place because sodium is more reactive than hydrogen.

I just took the test. The answer is D! (A single replacement reaction takes place because sodium is more reactive than hydrogen.)

Low pressure and high temperature, because particles are spread farther apart and moving faster, so the intermolecular forces of attraction are weaker

Explanation:

At low pressure and high temperature, gas molecules are separated and do not associate appreciably.

Recall that the the kinetic theory of gases holds that there is only a negligible intermolecular interaction between gases hence particles of a gas are relatively free and move about randomly at maximum velocities and kinetic energy.

This is only possible at low pressure and high temperature. At low pressure, gas particles are separated from each other and do not interact appreciably. High temperature imparts maximum kinetic energy to gas particles. Hence the answer.