PROBLEMS Answer the test questions - ILA calorimeter contains water at 0 "C and pieces of floating ice. If the water is stirred with a metal bar for a while, which one of the following can beobserved?A) Some of the 1ce pieces meltB) Some of the water freezes.C) All of the water freezes. D) Nothing changes2. The amount of heat needed to change the temperature of a unit mass of a substance by 1 "C iscalled:A) Heat of vaporisationB) Specific heat capacity C) Heat of fusionD) Heating value3. Two blocks of copper and aluminum have the same mass and temperature of 0 *C They are dropped into two different calorimeters. Each Which ONE of the statements is correct when calorimeters reach thermal equilibrium?calorimeter has water of 100 g at 60 "C. Take specific heat capacity of calorimeters to be zeroA) The copper has a higher temperature than thealuminumB) The copper has a lower temperature than thealuminumC) The temperatures of the two calorimeters are the D The answer depends on the volumes of the metalsameblocks4 Which of the following is the process by which a solid changes directly to a gas?A) MeltingB) Evaporation C) FreezingD) Sublimation5. When a sample of vapour condenses into a liquid, A) it gains heatB) it loses heatits temperature rises D) its temperature drops6 In the SI unit system heat is measured inA) NewtonsB) Kilograms C) MetresD) Joules7. During boiling of water, the molecules of water move faster. I II. the temperature of water increases.III the water molecules move slowlyIV. the temperature doesn't change Which of the statements above are correct?A) I and IIB) I, II, IV C)l and IVD) II, III and IV8.100 g of water at 0 C is added to 80 g of water at90 "C. Calculate the final temperature of the mixtuA) 20 CB) 40 °C C) 45 °CD) 60 CAnswer the questions 9, 10 and 11 looking at the information below.An iron block at 200 "C is dropped into a calorimeter which contains 50 g of water. The calorimeter is tightly closed. The graph below shows thetemperature changes of waterTemperature IC14010060Time Is9 What is the final temperature of the iron?A) 60 °C B) 100 CC) 140 "C D) 200 °C10. How much energy did the water gain when it became vapour at 140 C?A) 24 kJB) 27 kJ C) 28 kJD) 125 kJIL What is the mass of the iron?A) 5 kg B) 2 kgC) 200 g D) 500 g​