Question

Part A A person packs two identical coolers for a picnic, placing twenty-four 12-ounce soft drinks and 5 pounds of ice in each. However, the drinks put into cooler A were refrigerated for several hours before they were packed in the cooler, while the drinks put into cooler B were at room temperature. When the picnickers open the two coolers three hours later, most of the ice in cooler A is still present, while nearly all of the ice in cooler B has melted. Explain the difference This difference can be explained by the different composition of the drinks. When both drinks are placed into the ice, they release heat which then melts the ice in both coolers. But in cooler A the drinks are pre-chilled so they can absorb heat back and cool water back to ice. When warm drinks are placed into the ice, they release heat which then molts the lo The pre-chilled drinks are already cold so they do not release much heat and do not melt the ice. The ice would melt in both coolers anyway because three hours is enough time to melt 5 pounds of ice. So in cooler B both drinks and water will be at room temperature. But in cooler A the temperature of pre-cooled drinks is lower than the room temperature, they will absorb heat from water and freeze it.

Answer 1

Two coolers namely A and B are given. Both the coolers are at same condition. Now, each cooler has been filed with twenty-four 12-ounce soft drinks and 5 pounds of ice But cooler A is filled with refrigerated soft drinks; whereas, cooler B is filled with soft drinks at room temperature. In case of cooler A, the ice and soft drink are at almost same temperature. The temperature difference between them is approximately negligible. Thus, there is no heat exchange taking place leading to no melting of ice. In case of cooler B, the ice and soft drink has a high temperature difference as one is at room temperature and other is at 0°C. Thus, there will be heat exchange taking place leading to melting of ice Hence, the correct answer is option 3: When warm drinks are placed into the ice, they release heat which then melts the ice. The pre-chilled drinks are already cold, so they do not release much heat and do not melt the ice.