1. An iron cube of mass 0.55 kg is raised to a temperature of 100C by being placed in boiling water for 5 minutes. It is then removed and transferred immediately to an aluminium calorimeter filled with 250 g water at 20C. This is stirred until thermal equilibrium is reached. The mass of the calorimeter is 0.040 kg. Specific heat capacity of iron = 440 J kg -1 .K-1 Specific heat capacity of water = 4184 J kg K Specific heat capacity of aluminum = 910 J kg K1 a. Distinguish between thermal energy and temperature. b. Determine the final temperature of the mixture. d. Why the metal is transferred as quickly as possible to the water. e. Why is the water stirred. 2. An 80 W electric heater is used to heat 1000 cm volume of water initially at 15C, placed in in a steel container of mass 0.06 kg. Both the water and the container are in thermal equilibrium. Specific heat capacity of water = 4184 J kg K Specific heat capacity of steel = 510 J kg K Density of water = 1000 kg m a. Calculate the energy needed to raise the temperature of the system to 80.0C. b. Determine the total time needed to raise the temperature of the system to 80.0C. The specific latent heat of vaporisation of water is 2.26 106 J kg. c. Define specific latent heat of vaporisation. d. Calculate the total energy required to convert all the water to steam at 100C from its initial temperature of 15.0C.