Advertisements
Advertisements
Question
Write scientific reason.
Even if boiling water is constantly heated, its temperature does not rise.
Solution
- The heat energy absorbed at a constant temperature during transformation of liquid into a gas is called the latent heat of vaporisation.
- When heat is supplied to boiling water, it is used to weaken the bonding between molecules of water, causing transformation from liquid state to gaseous state, i.e., steam.
- As the heat supplied is utilized for the change of state entirely, temperature of water does not change.
APPEARS IN
RELATED QUESTIONS
What is the energy absorbed during the phase change called?
Calculate the total amount of heat energy required to convert 100 g of ice at −10℃ completely into water at 100℃. Specific heat capacity of ice = 2.1 J g-1 K-1, specific heat capacity of water = 4.2 J g-1K-1, specific latent heat of ice = 336 J g-1.
Explain the following temperature vs time graph.
What is meant by latent heat? How will the state of matter transform if latent heat is given off?
Liquid ammonia is used in ice factory for making ice from water. If water at 20°C is to be converted into 2 kg ice at 0°C, how many grams of ammonia are to be evaporated? (Given: The latent heat of vaporization of ammonia = 341 cal/g)
When a liquid is getting converted into solid, the latent heat is ………………………………
What is the name given to the energy absorbed during a phase change?
Define specific latent heat of vaporization of a substance.
What happens to the heat supplied to a substance when the heat supplied causes no change in the temperature of the substance?
Why water get cooled in a ‘Surahi’ in hot season?
Why do we feel much comfortable when we sit under a moving fan especially when our body is sweating?
Steam at 100°C is passed over 1000 g of ice at 0°C. After some time, 600 g of ice at 0°C is left and 450 g of water at 0°C is formed. Calculate the specific latent heat of vaporization of steam (Given: specific heat capacity of water = 4200 J/kg°C, specific latent heat of fusion of ice = 336,000 J/kg.)
If pressure increases, the melting point of a substance ______.
Write the name.
Products obtained when sugar is heated.
Write the name.
The phase in which solid substances are converted into liquid.
1 kg of dry air at a temperature of 40 °C can hold a maximum of 49 g of water vapour.
Write scientific reason.
Use a pressure cooker to cook food in cold air.
Who introduced the term latent heat?
Calculate the amount of heat required to convert 200g of ice at 0°C into the water at 0°C Specific latent heat of fusion of ice = 336 Jg-1
Specific latent heat of a substance ______.
