Phases of materials?

Question

Explain why compressing a gas at constant temperature can cause it to liquefy.

Why are the liquid and solid forms of a substance referred to as condensed phases?

Answer 1

When you compress a gas you increase the pressure. When you increase the pressure the gas particles are force closer together increasing the intermolecular forces of attraction which makes the bonds stronger. These bonds are now harder to break causing the gas to change state. In addition to this factor the increase of pressure causes the gas particles to loose kinetic energy since there is less room to move around in this loss of energy cause the state to change because the particles speed has slowed.

Liquids and solids are referred to as condensed states because the particles in the substances are closer together than those of gasses due to the intermolecular forces of attraction, thus making them denser and causing them to have characteristics of liquids and solids. This makes them different from gases because unlike gasses whose particles are spread out , the particles are packed closer together.

Answer 2

The phases of matter relate how closely the molecules are to one another. At lower temperatures, the individual molecules have less energy and do not move about so much, and thus, tend to settle into a liquid or solid form.

Compressing a gas clearly forces the molecules close enough together for them to behave like a liquid. Similarly, if you were to step outside a space shuttle in the vacuum of space, your blood would boil (well, your whole body would pretty much explode)!

Answer 3

There are two forces that act on substances and determine their state if matter: temperature and pressure.

In order for any liquid to boil and turn into a gas it's vapor pressure (the pressure inside the liquid) must exceed the external pressure acting on it. For water to boil a sea level, it's vapor pressure must exceed 101.3 kilopascals, which is atmospheric pressure.

As you add pressure onto a gas while maintaining the same temperature, it's vapor pressure remains the same while the external pressure acting on it increases. If the pressure goes above the vapor pressure, the gas will liquefy.

The same thing can occur with liquids turning into solids under enough pressure. This same principle is also why water will boil at room temperature in a vacuum (near zero pressure, not the appliance).

Answer 4

the reason is how separte are the molecules one from another.

when it's gas molecules are very separeted, in liquid not as gas and in solid the molecules are very near one from another, near molecules yoou can say are condensed, very close.

Answer 5

1. so much pressure will make the molecules give and eventually liquify

2. the molecules are together and not seperated

Answer 6

WHO THE HELL CARES, 700 ANSWERS!
YAAAAAAAAAHOOOOOOOOO