# Answer on Molecular Physics | Thermodynamics Question for MRB

Question #63311

Q The specific latent heat of fusion of ice is 334000 j/kg. What does this mean?

Q At 100c water has a specific latent heat of vaporization of 2260 000 j/kg. What does this mean? How much thermal energy would be needed to change 2 kg of water at 100c into steam at the same temperature? How much thermal energy would be needed to change 10 kg?

Q Explain the terms of Kinetic theory why

a) Thermal energy is needed to turn a liquid into a gas.

b) Evaporation produces cooling.

Q An electric kettle has a power rating of 2.1 kw. The kettle is filled with 1.5kg of water at a temperature of 20c. How long after the kettle is switched on will the water start to boil?

Q At 100c water has a specific latent heat of vaporization of 2260 000 j/kg. What does this mean? How much thermal energy would be needed to change 2 kg of water at 100c into steam at the same temperature? How much thermal energy would be needed to change 10 kg?

Q Explain the terms of Kinetic theory why

a) Thermal energy is needed to turn a liquid into a gas.

b) Evaporation produces cooling.

Q An electric kettle has a power rating of 2.1 kw. The kettle is filled with 1.5kg of water at a temperature of 20c. How long after the kettle is switched on will the water start to boil?

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