Cooling drinks
Cooling Drinks
1) What is the specific latent heat of fusion of water?
Specific latent heat of fusion is the amount of heat absorbed or released by a substance when changing states. This could be boiling or melting. Latent heat of fusion is the amount of energy needed to melt a substance, while latent heat of vaporisation is the amount of energy needed to boil a substance. The specific latent heat of fusion of water is 334 j/g
In the graph, you can see that as the temperature increases more energy is needed to heat the water. When the temperature hits the latent heat of fusion, the temperature stops rising as the energy is being used to change the state of water. This also happens when the latent heat of vaporisation
2) What is the specific heat capacity of water?
The specific heat capacity is the amount of heat that is needed to raise the temperature of a substance. The specific heat capacity water is 4181 j/kg. This is higher than most metals. Here are some other substances with their specific heat capacity;
Substance
C (J/g oC) Air 1.01 Aluminium 0.902 Copper 0.385 Gold 0.129 Iron 0.450 Mercury 0.140 Sodium Chloride 0.864 Ice 2.03 Water 4.18
3) Why energy is needed to melt ice and how this is explained by the structures of ice and water
The molecules of H20 behave differently in water than in ice. In water they are floating around freely and in ice they are "stationary", they only vibrate slowly. This is because they don’t have enough energy to break their intermolecular bonds.
So in order to melt ice you need to add energy to give the molecules kinetic energy to move around, becoming less stationary. If enough energy is given to the molecules they break the intermolecular bonds and the ice melts to ice.
4) Why is ice more effective for cooling a drink than cold water
The cooling of a drink with a cube of ice is more effective than using cold water because ice can absorbs a lot more heat. This is
1) What is the specific latent heat of fusion of water?
Specific latent heat of fusion is the amount of heat absorbed or released by a substance when changing states. This could be boiling or melting. Latent heat of fusion is the amount of energy needed to melt a substance, while latent heat of vaporisation is the amount of energy needed to boil a substance. The specific latent heat of fusion of water is 334 j/g
In the graph, you can see that as the temperature increases more energy is needed to heat the water. When the temperature hits the latent heat of fusion, the temperature stops rising as the energy is being used to change the state of water. This also happens when the latent heat of vaporisation
2) What is the specific heat capacity of water?
The specific heat capacity is the amount of heat that is needed to raise the temperature of a substance. The specific heat capacity water is 4181 j/kg. This is higher than most metals. Here are some other substances with their specific heat capacity;
Substance
C (J/g oC) Air 1.01 Aluminium 0.902 Copper 0.385 Gold 0.129 Iron 0.450 Mercury 0.140 Sodium Chloride 0.864 Ice 2.03 Water 4.18
3) Why energy is needed to melt ice and how this is explained by the structures of ice and water
The molecules of H20 behave differently in water than in ice. In water they are floating around freely and in ice they are "stationary", they only vibrate slowly. This is because they don’t have enough energy to break their intermolecular bonds.
So in order to melt ice you need to add energy to give the molecules kinetic energy to move around, becoming less stationary. If enough energy is given to the molecules they break the intermolecular bonds and the ice melts to ice.
4) Why is ice more effective for cooling a drink than cold water
The cooling of a drink with a cube of ice is more effective than using cold water because ice can absorbs a lot more heat. This is