(a) Which requires more heat : 1 g ice at 0oC or 1 g water at 0oC to raise its temperature to 10oC ?
(b) Explain your answer in part (a).
(a) Which requires more heat : 1 g ice at 0oC or 1 g water at 0oC to raise its temperature to 10oC ?
(b) Explain your answer in part (a).
Of course 1 g water at 0°C will contain more energy. There’s nothing like heat content/ work content of body/system. Heat & work are experienced while in transition or crossing system boundaries.
Since ice at 0°C has consumed more heat energy to change its phase to a liquid state. Which is generally called Latent/hidden heat that can’t be sensed by a thermometer that’s why temperature remains constant at 0°C.
So, liquid water at 0°C has the extra latent heat consumed, hence contain more energy (heat).
OR
1g of water contains more heat than 1g of ice.
Enthalpy (i.e. heat) of water = Enthalpy of ice + latent heat
Latent heat is the heat required to change the phase of the substance. In this case, latent heat is heat required to melt 1g of ice at 0°C. Latent heat just changes the state/phase of the substance without changing its temperature.
Hence, 1g of water has more heat than 1g of ice at 0°C
Of course 1 g water at 0°C will contain more energy. There’s nothing like heat content/ work content of body/system. Heat & work are experienced while in transition or crossing system boundaries.
Since ice at 0°C has consumed more heat energy to change its phase to a liquid state. Which is generally called Latent/hidden heat that can’t be sensed by a thermometer that’s why temperature remains constant at 0°C.
So, liquid water at 0°C has the extra latent heat consumed, hence contain more energy (heat).
OR
1g of water contains more heat than 1g of ice.
Enthalpy (i.e. heat) of water = Enthalpy of ice + latent heat
Latent heat is the heat required to change the phase of the substance. In this case, latent heat is heat required to melt 1g of ice at 0°C. Latent heat just changes the state/phase of the substance without changing its temperature.
Hence, 1g of water has more heat than 1g of ice at 0°C
