Question

2. One student at a restaurant asks for water with lots of ice, while another asks for only a little ice. The waiter uses bottled water from the same bottle and ice from the same ice bucket to fill the order. There is still ice in both glasses when the water comes to thermal equilibrium Will the temperature of the water in the glass with only a little ice be (a) greater than (b) less than, or (c) the same as the temperature of the water in the glass with lots of ice? Explain your reasoning. 3. Two pans each contain the same amount of water. The water in each pan started out at 20 oC, and both pans were heated until the water reached a temperature of 94 °C. The pan in Case A was left open while it was heating, and the pan in Case B had a tight glass lid over it while the water was heating. A student makes the following contention: "Since both pans have the same amount of water and both were heated from the same initial temperature to the same final temperature, the same amount of heat had to be added to both." There is a problem with the student's contention. Identify the problem and explain how to correct it.

Answer 1

solution (2) > There is still ice in both the glasses at thermal equilibirium. so temprature at both the glasses water will be at the same temprature and this temprature is equal to freezing temprature of ice that is (C) And correct option is The same as the temprature of the water in the glans with lots of ice. (3) y from the open pan some of water vapour goes out at the pan, But from the Pantight with Lid nothing came out so Heat given in case A is more than in Case B. so the required correction is ng Heat given (added) the pan in case A ý more than Heat added to the Pano in case B.