"why temp of water does not change as it melts"??

Question

this is in my sci book i dunno wtf they think theyre saying, i thought it did but i guess not cuz they ask...

Answer 1

This is true.

The heat effects, in calories, that accompany a change in state is called a latent effect, because no temperature change is evident. Heat of vaporization, fusion, sublimation, and crystal form are examples. It is called latent because it is not associated with a change in temperature. Each substance has a characteristic heat of fusion, associated with the solid-liquid transition, and a characteristic heat of vaporization, associated with the liquid-gas transition.

The latent heat of fusion for ice is 80 calories per gram. This is the amount of energy needed to change ice to water, with no change in temperature.

For a good illustration see this website:
http://www.physchem.co.za/Heat/Latent.htm#fusion

Answer 2

I think you mean why does the temperature of ice (or any substance) does not change when it goes through a phase change.

(You are talking about the flat line, right! I asked the same exact question years ago and the answer is pretty simple and it makes sense)

The temperature changes because of transfer of heat/energy. If energy is added, the temperature rises. If it is removed, then temperature drops. Now, if I keep adding a constant amount of energy on a regular basis, the temperature will keep on rising, until I reach a phase change, then the temperature will not rise until the all of the ice has completely melted. The reason is that the energy is all being used to break/loosen the bonds between atoms/molecules. So the energy does not contribute to a temperature change. Once, the energy is stopped being used for breakage, it starts raising the temperature again.

The same exact thing happens when you take away energy from a system to drop the temperature. If I am freezing water, the temperature keeps dropping until I hit the solid phase, then the TEMPERATURE will remain constant, even though I am still taking away energy, until all of the liquid water has been converted into solid ice. Then the temperature will resume dropping.

Answer 3

The action of water melting or freezing is a thermodynamic state in which energy is transfered to eithe cause melting or freezing of water. Both ice and water have have a property called heat capacity in which the properties of water will change based upon the amount of energy imparted into the water. If the water is cooled, then energy leaves the water until it is cooled enough to reach the freezing point. At that point in time, the temperature will drop dramatically as the water turns from liquid to solid. This change in temperatrue is cause "freezing point depression." The same thing happens in reversew when ice melts, or when watergoes liquid to steam. The reason is the changeinphase, from liquid, to solid, or solid to liquid takes energy.

As this energy is utilized to liquify, or freeze water, it is used, nonetheless to change the phase of water.

A good example of this pheonomenon with wateris seen when snow falls. It gets cold, and as the temperatur drops, there is a distinct pause in temperature change when snow begins to fall. The ambient temperature cannot go below 31 degree F, until all the moisture in the air has been frozen.

So, as you watch it snow, you will find the temperature remains at 32 degrees, until the snow stops. At that point, all the water in the air is gone.

Answer 4

There is a form oh heat needed to convert 1 gm of ice at 32 degrees F to 1 gm of water at 32 degrees F, called "Laten Heat",

any extra heat exposure, after that point can raise the temprature of water over 32 degrees F, the freezing point for water.

Answer 5

Water cannot melt.

If water is frozen to ice, the temperature holds steady at 32*.

If ice is melted, the water that appears as the ice melts will warm to room temperature (or to the temperature you are subjecting it to).

Whatever ice is still present will still be 32* because it is still ice.

Hope this maybe clears things up.

Answer 6

gee, well as ice melts its temp is raised but the action of the ice melting also cools the water around it, so i suppose the two actions together in a particular space could constantly be cancelling each other out.

Answer 7

Its due to the phenomenon of anomalous behavior of water.

Answer 8

Due to the boding forces,covalent bonds

Answer 9

How can water melt?

Answer 10

i think u mean ice?