Question

_1. Qoola A, True Qhot is a statement of energy conservation. [5] B. False __2. At the moment ice at 0°C melts into water, the temperature increases. A. True B. False _3. A large -20°C ice cube is dropped into a super-insulated container holding a small amour ulated container holding a small amount of 5°C water, then the container is sealed. Ten minutes later, the temperature of the ice cube will be colder than -20°C. (S) A. True B. False C. Maybe. It would depend on other factors. 4. what are two major sources that could lead to inaccurate determination of the latent heat of fusion? 5. Suppose 0.05 kg of ice at 0°C is added to 0.20 kg of water at 30°C in a Styrofoam cup, so that there is no heat "ost or gained by the Styrofoam cup. Find the equilibrium temperature. [Lr = 80 kcal/kg, Cw = 1kcal/kg °C]. Show complete work for credit. [10]

Answer 1

1. Blood & hat in a statement of energy conservation It states that the heat lost by the best body is equal The heat gained by the cold body. (True) . d. false. (Phase change is not accompanied by a charge in temperature) 3. False (Became the ice will in any way gain heat from the tales, so its temperature camist decrease of 5. Heat lost by the water = Hear gained by the ice at the final temperature of wrates be Tf Hear lost by rates M Car (30-77) where mar is the mass of water Hear gaired by ice milz + Mi Cu (T-0) where mi is the map of e -) 0.2 x 1x10 3 (30-Tp) = 0.05x80x10 + 0.054 1810 Ty 6ooo - dooty = 4000 + SOTA 2000 = 257 och - This is the equilibrium temperaturel