Question

1. Твердое тело нагревают в сосуде. Результаты измерения его температуры приведены в таблице: время, мин 0 2 4 6 8 10 12 14 16 температура, 0С 22 46 70 94 94 94 94 114 134 Через 12мин в каком состоянии находится тело в стакане? 1) в жидком; 2) в твердом; 3) и в жидком, и в твердом; 4) в жидком и газообразном

Answer 1

Правильный ответ: 3) и в жидком, и в твёрдом

Answer 2

Heating of a Solid Body in a Vessel

When a solid body is heated in a vessel, the temperature measurements are recorded in a table. The table shows the temperature of the body at different time intervals. The measurements are as follows:

| Время, мин | 0 | 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | |------------|---|---|---|---|---|----|----|----|----| | Температура, °C | 22 | 46 | 70 | 94 | 94 | 94 | 94 | 114 | 134 |

State of the Body After 12 Minutes

After 12 minutes, the temperature of the body has reached 94°C and remains constant at this temperature for the next 2 minutes. Then, the temperature increases to 114°C at 14 minutes and further to 134°C at 16 minutes.

Based on these observations, we can determine the state of the body in the vessel after 12 minutes.

The state of the body after 12 minutes is: 3) In both liquid and solid states

The temperature of 94°C indicates that the body has reached its melting point and is in the process of transitioning from a solid to a liquid state. However, the temperature remains constant at 94°C for 2 minutes, indicating that the body is undergoing a phase change. Therefore, it can be concluded that the body is in both liquid and solid states at this time.

This conclusion is supported by the fact that the temperature continues to rise beyond 94°C, reaching 114°C and 134°C at 14 and 16 minutes, respectively, indicating further heating of the liquid phase.

Therefore, the body is in both liquid and solid states after 12 minutes in the vessel.