Why does the temperature not change when ice melts to form water?
Answers
Answered by
27
During a change in state the heat energy is used to change the
bonding between the molecules. In the case of melting, added energy is
used to break the bonds between the molecules. In the case of freezing,
energy is subtracted as the molecules bond to one another. These energy
exchanges are not changes in kinetic energy. They are changes in bonding
energy between the molecules.
"If heat is coming into a substance during a phase change, then this
energy is used to break the bonds between the molecules of the
substance.
The example we will use here is ice melting into water. Immediately after the molecular bonds in the ice are broken the molecules are moving (vibrating) at the same average speed as before, so their average kinetic energy remains the same, and, thus, their Kelvin temperature remains the same.
Hope this helped u :-)
The example we will use here is ice melting into water. Immediately after the molecular bonds in the ice are broken the molecules are moving (vibrating) at the same average speed as before, so their average kinetic energy remains the same, and, thus, their Kelvin temperature remains the same.
Hope this helped u :-)
Answered by
14
"When we heat an ice cube, it melts to liquid state of water. Hence, we can say that heating of ice involves the conversion of physical state from solid to liquid.
Because of this fact, when we heat, the "heat energy" is used to remove the bonds "between the molecules" so, no temperature increases for ice as all heat "energy is used" to remove the bonds to melt the ice. Overall, we can say that if the physical state is changed, the temperature will remain constant."
Similar questions