Why does changing a liquid to a gas require a large amount of heat energy?

Answer 1

It excites the molecules enough to make them break away from each other and become a gas; it forces molecules further away. Temperature is just a measure of how much energy(movement) a molecule has.

Answer 2

Changing a liquid to a gas requires a large amount of heat energy because the molecules in the liquid need to overcome intermolecular forces that hold them together. This energy is used to break these bonds and allow the molecules to transition into a gas phase.

Answer 3

When heat is applied to a liquid a transformation begins. As the temperature of the water increases it is aproaching its boiling point which is 100 degrees Celcius. After that the water starts to evaporate. Looking closer, the molecules when they are liquid are very tightly bound and they dont have much room to move and therefore does not have alot of kinetic energy. But the increase of temperature affects the kinetic energy, raising it too. Finally when the kinetic energy reaches its peak (the boiling point) the molecules break apart and escape into the atmosphere.

You can test this theory by boiling a pot of water to a hundred degrees celcius and place a lid over the top. Water collects on the top because of the evaporation of the water (the molecules that are trying to escape into the atmosphere).

Answer 4

Because the molecules move faster and faster as the liquid becomes hotter. Eventually, the molecules are moving fast enough to escape at the surface of the liquid and rise into the atmosphere above.

Answer 5

thermal energy is needed because it makes the particles less dense, move faster, and spread farther apart, changing it into a gas.

Answer 6

Liquid turns into gas when the liquid is boiled. Then it evaporates into gas.

Answer 7

The molecules in Liquids are more closely compact than Gas. A large amount of heat energy is required to separate the bonds between the molecules.

Answer 8

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