Latent Heat Energy is required for a material to change phase, even though its temperature is not changing. (m) Mass of the object (L) Latent heat of the fusion or vaporization (Q) Thermal energy added

Heat of fusion, Lf: heat required to change 1 Heat of fusion, Lf: heat required to change 1.0 kg of material from solid to liquid Heat of vaporization, Lv: heat required to change 1.0 kg of material from liquid to vapor Chapter 14 - Page 392 Heat 14 (13 of 32)

Latent Heat Q2= mLf Q4= mLv 3.33 x 105 J 22.6 x 105 J 1 kg Ice -50 oC 50 100 150 Q1= mcIDt 1.05 x 105 J Q3= mcWDt 4.19 x 105 J Q5= mcSDt 1.01 x 105 J Specific Heat Specific Heat Specific Heat

Heat required to convert 1 kg of ice at -50 oC to steam at 150 oC Q1 = 1.05 x 105 J Q2 = 3.33 x 105 J Q3 = 4.19 x 105 J Q4 = 22.6 x 105 J Q5 = 1.01 x 105 J 3.22 x 106 J

Problem: A large block of ice at 0 oC has a hole chipped in it, and 400 g of aluminum pellets at a temperature of 30 oC are poured into the hole. How much of the ice melts?

Problem: 100 W A heating coil is placed in a thermally insulated tank of negligible heat capacity. The tank contains 0.10 kg of water and 0.010 kg of ice, both initially at 0 °C. The coil delivers energy at a rate of 100 W.

Find the heat transferred to the water and ice by the heating coil in the first 10 s.

Find the time required to melt all of the ice

After the ice is melted find the additional time required to bring the water to a boil.