Why is heat required to boil water.?

Question

Try to explain using the particle theory of matter.

Answer 1

Boiling water is when evaporation can take place due to the particles having enough kinetic energy to change state. When you heat water, heat energy is transferred to the particles in the liquid, giving them kinetic energy. Liquids can move around within their structure but not freely like gases. So the heat provides energy for the liquid particles in the water to vibrate more vigorously and eventually break away from each other, forming a gas (water vapour)

Answer 2

In vacuum you do not require heat to boil water. Boiling is basically when vapor pressure is equal to the atomspheric pressure. If there is no atomspheric pressure(almost negligible predsure), things boils out itself as vapor pressure will automatically be greater than negligble vacuum pressure.

Also normal answer if you want. Temp is basically the measurement of movement of particle. In absolute zero tenp if possible( particle will be stationary). Thus if you add heat, you are basically increasing the movement of the molecule. Water molecule could break hydrogen bond when you add heat and move to the atomsphere increasing the vapor pressure. To be more accurate, temp is actually average movement of molecules. This means all particles movement is not in constant speed. some may vibrate faster. Ones that vibrates faster could break away from the surface of the water.When that vapor pressure reaches atomspheric pressure, you have boiling. Water boils at 60-70 C in mountain.

Answer 3

Actually, ENERGY is required to boil water, but not necessarily heat. Heat is energy transferred due to a temperature difference, as in boiling water over a fire. You can also add the energy in other ways. For example, you can boil water in a microwave where the energy comes from microwave EM radiation.



The energy is needed to change the phase of the water from the liquid to the gaseous state.

Answer 4

For water to boil, the water vapor pressure must be equal to the atmospheric pressure. At standard temperature and pressure, water boils at 100˚C. From the water molecules point of view, water vapor pressure is caused by the water molecules colliding with the molecules in the air. Water molecules are always moving back and forth. Temperature measures the average kinetic vibrational kinetic energy of the molecules. At 100˚C, the water molecules have enough of this energy to break the bonds between them and produce water vapor pressure that is equal to the atmospheric pressure. The next time you boil water, you can see the results of these two processes.

Answer 5

Water can be boiled by adding enough heat, or by decreasing the pressure enough. Water can boil at room temperature if it is in a vacuum.

Answer 6

Without heat or rising the temperature of water you can't boil it :)

Answer 7

Superman

Answer 8

100 celcius

Answer 9

How else would it boil?

Answer 10

40.65 KJ/mol at STP.