Freezing is an exothermic process in which heat is expelled out. When the freezing process takes place the particles of a liquid substance slowly lose energy thus turns into a solid state. Another name of freezing is solidification.
As we know very well, Matter is made up of small particles. These all small particles are also so minute that we cannot see with naked eyes. Whenever heat is supplied to them they start moving from their original position. This heat energy is also represented as providing kinetic energy to the particles. On receiving heat this starts colliding with each other, if we keep on raising the temperature, at the end of this stage, they will turn themselves into another form.
You should remember the more heat we utilize the more change in the state.
In another way, we can also explain it as in solids particles are closely packed because there is a great force of attraction between them. On continuous supply of heat, They start colliding with each other and this attraction becomes weak. Thus, change into a liquid. Whereas gaseous particles are free to move as there is a negligible force of attraction.
Similarly, Instead of giving them the heat energy, if we take out heat from the substance, it also changes it’s state vice-versa.
How freezing is an exothermic process?
As we said earlier, The heat we are giving to a matter is the kinetic energy and this energy certainly increases the particle collisions of the matter. What does this mean? Explaining in simpler words, this means that a gaseous state has more heat energy than a liquid and a liquid has more energy than a solid-state.
When heat is supplied to a block of ice, it will turn into a liquid and when more heat is given to it, it will turn into a gaseous state.
During the process of freezing, heat is taken out from this substance. For example- When water is cooled it changes into ice. We can easily lower the temperature of the water by placing it into the refrigerator compartment. Water turns into ice because energy has been extracted from it which was a reason of being liquid. So that is why Freezing is an exothermic process.
You must remember that freezing is the reverse of melting. When water freezes to become ice when there is a change from a liquid state to a solid-state.
Melting and freezing point of Water
If a teacher asks you about the Melting and freezing point of a water then your answer should be zero degree Celsius.
You also so bear in mind, the freezing point of a liquid is the same as the melting point of its solid form. When water is at zero degrees Celsius, it is the initial state when water starts to turn into ice. As the temperature becomes lower it will achieve a solid state.
Similarly, the melting point of water is also zero degrees celsius. It is the temperature at which ice starts its changing state. The temperature keeps rising more, it will move towards a gaseous state as it is achieving more heat.
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