Question

1.A metal smith pours 3.5 kg of lead shot at 93.0oC into 1.6 kg of water at 28.0oC in an isolated container. What is the final temperature of the mixture? Give your answer to one decimal place in units of oC. Cwater = 4.19 kJ/(kg*K), Clead = 0.129 kJ/(kg*K)

2. If heat is added to a material, the temperature must increase. True False

3. Cwater = 4.19 kJ/(kg*K) Cice = 2.06 kJ/(kg*K), Lfusion=334 kJ/kg Lvaporization=2260 kJ/kg How much heat (in kJ) is required to convert 0.7 kg of ice at -40oC to ice at 0oC? Give your answer to one decimal place.

4. Cwater = 4.19 kJ/(kg*K) Cice = 2.06 kJ/(kg*K), Lfusion=334 kJ/kg Lvaporization=2260 kJ/kg How much heat (in kJ) is required to convert 1.0 kg of ice at 0oC to water at 99oC? Give your answer as a whole number.

Answer 1

not be increased. Whan phase ③ we have to use the principle of mixtures. Heat lost by hot bodies & Meat gained by cold badres Glost - a gained m. (TL-T) = merceo (T-Tw) » (3.5) (0-124) (93-T) = (1-6) (4:19)(1 – 28) - 41-9893 - 0,45IST. 67041 -187.712 & T = 132.100) & False Temperature may e heat is added but temperature remains same a = mcist = (0.7) (2.06) Co-(-40%) = (57.7 kT] Q=Qf tQn - mlft mwDT (4) [ (334) + (4:19) (99-01] [749 kJ) on me honges. 9

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