Why does boiling water take longer than melting ice?

Answer 1

It has to do with the intermolecular forces of the water molecule. When you convert ice to liquid water you are only partially overcoming these forces. This allows one water molecule to pass over another (which is why it flows). Within the liquid the existence of the hydrogen bonds keeps the molecule much closer than with only van der waals Interactions (I believe it is about 15% closer). When liquid water converts to vapor you are completely disassociating the hydrogen bonds between the molecules.

Answer 2

Ice Melts at 32 degrees. Water boils at 212 degrees. Maybe it takes more energy to bring water to the boilding point. The amount of energy required to melt one mole of a solid depends on the strength of the forces keeping the particles together in the solid. The hydrogen bonds between water molecules are strong so it takes a large amount of energy. Anyways, the energy required to melt ice is a lot less than the energy required to melt table salt because the ionic bonds in sodium chloride are much stronger than the hydrogen bonds in ice.

Answer 3

It takes more energy to boil ice than it takes to boil water because the number of degrees that the temperature must be raised to reach a boiling point of 220F (100C) is greater.

If ice is at the freezing point of 32F, it must be heated 188 degrees before it is at the boiling point, while liquid water at a room temperature of, let's say, 70F only needs to be raised 150 degrees.

Answer 4

Water must be raised to a higher temperature to melt it, because there are many Hydrogen bonds which inhibit evaportation from occurring at lower temperatures. So, water has a high molar heat of vaporization, meaning that more heat is required to evaporate one mole of water. Forzen water, or ice, melts more easily because of the structure of ice. Ice holds a hexagonal lattice work which includes molecules moving apart and H-bonds reaching their maximum number. With the ice having a lower density and a higher surface area, the heat of another object is more apt to affect the ice.

Answer 5

The reason that melting ice usually happens faster than boiling water is because water is one of the few things that stays hard even though it is really close to its melting point (32 degrees Fahrenheit) freezers usually stay around 0 to 20 degrees so it only has to raise around 10 degrees to start melting. However when it comes to boiling water you usually star around room temperature ( around 75 degrees) and have to go all the way up to the boiling point (212 degrees).

Answer 6

Ice melts at 0 Celsius. Ice, as you know it, won't be that much colder than 0, say -4 to -10 degrees.Water boils at 100 Celsius, and water at room temperature is about 20 Celsius. The amount of energy required to move to either state is proportional to the difference in temperatures. We can see, by observation, that 0 and 20 are a lot closer, and so have a smaller difference, than 20 and 100. Of course, the question parameters are not necessarily true. Ice could start out from any temperature, from 0 all the way down to about absolute zero, -273 (of course, that temperature isn't really viable, since its almost impossible to pump energy out of a system to such a degree, and things start getting rather quantumy at that point) So, if we had ice at -200, we can see that that is a lot more distance to travel til we get to 20. It's all relative, specifically, relative to the temperature.

Answer 7

yes boiling water does need energy you cant make boiling water without energy!i hope i answered your question