Generally, matter exists in three states solid, liquid, and gas and we all are surrounded by matter. All matter is made up of tiny particles with microscopic view particles are made up of atoms or molecules. The characteristics of a substance are determined by the type of molecules it is made up of. For example, a substance made up of large (heavy) molecules is heavier (has a greater density) than one made up of smaller molecules.
A substance can be any. Depending upon the type of material, boiling temperatures vary from one liquid to another.
When we heat up or cool down to a required temperature, substances change their state into one form or into another.
When we heat up the substance, it changes its state at a specific temperature and the amount of heat utilized is known as latent heat. It is calculated in Kilo Joules or in Joules only.
Is Boiling Endothermic Or Exothermic? Boiling is an endothermic process in which matter absorbs heat from the surroundings. This raises the temperature of the substance. A liquid changes into a gaseous form when getting heated to its boiling point. For example, water changes its state to steam grasping heat from the fire.
Molecules of matter exert attractive forces on each other. This means any two molecules of a substance that are close to each other attract each other with some force. This intermolecular force is called cohesive force in the case of molecules of the same substance. To ‘cohere’ means to stick together. The tendency of molecules to stick together due to the attractive force between them is called cohesion.
In the process of boiling, on heating, the substance molecules start moving from their place. This heat energy is sometimes also called kinetic energy. Provided heat is equivalent to exciting or pushing small invisible molecules to start striking with each other.
Why Boiling Is An Enothermic ?
We all know that matter exists in three phases solid, liquid, gas.
As you know, liquids have greater intermolecular forces than gases. This intermolecular force binds the smaller particles of the substance together to give a shape of a liquid. This structure and forces are not only are in one type of liquid substance but have the same situation for every liquid.
When liquid molecules strike with the adjacent other countless small molecules, this breakdown the existing liquid molecular forces. As we give more heat to the molecules, steadily with the rise in temperature, intermolecular forces keep on getting weaker. At last, a stage arrives when liquid intermolecular particle’s force almost get vanished or I say become negligible, thus turns into a gaseous state. So, that’s why boiling is an endothermic process
The whole process takes place only because the substance has taken in the heat from the surroundings. We have given only the example of water to make the understanding simpler and quicker.
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- However, it is interesting to note that steam has more heat and causes severe injury than that boiling water. Patients who get injured with steam take more time to recover them get hurt by boiling water. This happens because water particles absorbing heat turn into steam. This directly helps us to understand it is an endothermic process.
- Endothermic energy is used to run steam rail engines. You surely have read during the classroom that the first engine was a steam engine. Steam has more heat than water. It has so much heat to carry or push thousands of passengers without any stop. Whereas, this cannot be done with boiling water.
Is boiling water endothermic or exothermic
Water boiling is an endothermic process through which particles break down the force of attraction with each other. One interesting thing you should remember is that you can turn any solid substance into liquid through an endothermic process only by keep on adding heat. With the steady rise in temperature, you can turn ahead the substance to a gaseous form.
That’s a separate matter that every substance has its own grasping heat capacity. Water has a boiling temperature of hundred degrees Celsius. If we particularly talk about aluminum, it has a boiling temperature of more than 2,470 °C Celsius. Yes, aluminum can turn into a liquid state. All these substances like Mercury etc we have mentioned above go through the process of endothermic to change their state.
From the very next time, if somebody asks you grasping heat is an endothermic process? You should say- yes, of course, it’s an endothermic process because heat is taken in from the surroundings.
The cohesive force between the molecules of water is not as strong as that between the molecules of ice. Hence, the molecules can change their relative positions, though they cannot move away from each other. This is why water can flow and change its shape, though its volume remains the same. The volume of water does not change even when it is under pressure because its molecules cannot move closer together. This is why a liquid is incompressible.
The fact that the volume of a liquid does not change under pressure means that its density also does not change with pressure. However, liquids expand considerably when they are heated. Hence, the density of a liquid decreases when it is heated. This, as you may remember, helps to set up convection currents in a liquid. The warmer, lighter part of a liquid rises, while the colder, denser part of a liquid sinks.
Through the boiling endothermic process, molecules start vibrating from their position, strike with each other. Thus, rise in the temperature from both of the things- from the striking frictional heat itself and heat from outside that turn into a liquid form. If we heat further, then it will reach a boiling point.
The intermolecular force of attraction gets weaker. Heat supplied overcomes and breaks the force of attraction and changes into a liquid form.
On providing more kinetic energy, The minute particles become totally free with no force of attraction. They change themselves into a gaseous form. As an example, the same case happens with the water.
On rising up the temperature, it will switch into another form that we called a gaseous form.
It is to remember, during the boiling phase, the substance does not raise its temperature after the boiling point is achieved but at this latent heat point, temperature changes the state of matter only.
Experimentally, on deducing the temperature value of steam and water at 100 degrees celsius, it remains the same. Only, the substance turns into different forms.
Overall, the whole process is only possible through heat absorption and this process is commonly known as an endothermic process.