I would recommend examining Example 12.19 carefully. These types of questions ca
ID: 1661092 • Letter: I
Question
I would recommend examining Example 12.19 carefully. These types of questions can be both conceptually and mathematically challenging. With Example 12.19 in mind, consider the following case. A metal block is heated for a long period of time over a gas flame. The block is then removed and placed into an insulated beaker of water that is at room temperature (20°C). The beaker is then sealed. Which of the following choices are possible final states of the block-water system? Select all that apply. The final temperature could be 100°C with all of the water being converted to steam. The final temperature could be 100°C without any of the water being converted to steam. The final temperature could be 100°C with only some of the water being converted to steam. The final temperature could be less than 100°C without forming any steam. The final temperature could be less than 100°C with some water being converted to steam. The final temperature could be higher 100°C without any of the water being converted to steam. The final temperature could be higher 100°C with only some of the water being converted to steam The final temperature could be higher 100°C with all of the water being being converted to steam.Explanation / Answer
By the property of a liquid, it starts converting into gaseous form only after reaching its boiling point. Also the temperature of liquid will not rise beyond boiling point until all the molecules has been converted into gases because the heat applied to the liquid is absorbed as latent heat of vapourisation while transformation of molecules from liquid to gaseous state.
1. The final temperature could be 100°C with all of the water being converted to steam. : This is a possible final state.
2. The final temperature could be 100°C without any of the water being converted to steam: This is a possible final state.
3. The final temperature could be 100°C with some of the water being converted to steam: This is a possible final state.
4. The final temperature could be less than 100°C without forming any steam: This is a possible final state.
5. The final temperature could be less than 100°C with some water being converted to steam: This is NOT a possible final state because steam will only be formed when water will reach a temperature of 100°C.
6. The final temperature could be higher than 100°C without any of the water being converted to steam:This is NOT a possible final state because as water will reach 100°C, formation of steam will start. The temperature of water cannot rise beyond 100°C without formation of steam.
7. The final temperature could be higher than 100°C with only some of the water being converted to steam: This is a possible final state.
8. The final temperature could be higher than 100°C with all of the water being converted to steam: This is a possible final state.