Final Exam Questions& Answers..

Distinguish between a calorie and a joule. {Ans: 1 calorie = 4,186 Joules}Which warms up faster when heat is applied- iron or silver? {Ans: In order to answer this question, we must know the specific heat capacity of iron and silver. Material Specific heat Capacity [J/(kg °C)] Iron 448 Silver 234 When equal amounts of heat are added to the same amount of iron and silver, the silver will change temperature by a greater amount (or quicker if you think about putting both items over a flame) since it has a lower specific heat capacity. The lower the specific heat capacity, the easier it is to change the temperature of the substance.}In the power plant of a nuclear submarine, the temperature of the water in the reactor is above 100 °C. How is this possible? {Ans: The water is under higher than atmospheric pressure. Under higher pressures, water boils at a temperature greater than 100 °C.}Does a substance that heats up quickly have a high or low specific heat capacity? {Ans: A substance that heats up quickly has a low specific heat capacity.}Distinguish between evaporation and boiling. {Ans: Boiling is a phase change between liquid