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प्रश्न
A glass tumbler containing hot water is kept in the freezer compartment of a refrigerator (temperature < 0°C). If you could measure the temperature of the content of the tumbler, which of the following graphs (Fig.1.2) would correctly represent the change in its temperature as a function of time.
पर्याय
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उत्तर
The hot water in the glass tumbler kept in the freezer will first become cold and the temperature will drop till 0°C. At 0°C, water loses heat equal to the latent heat of fusion till entire water freezes to form ice at 0°C. During this change of state from liquid to solid, the temperature remains constant.
On still further cooling, the temperature of ice slowly falls with time. Therefore, the correct option is (a).
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संबंधित प्रश्न
Differentiate between melting point ,giving atleast one example of each.
Explain the term Melting.
Explain the term Melting Point.
Some ice is taken in a beaker and its temperature is recorded after each one minute. The observations are listed below
| Time (in minute) | Temperature (in °C) |
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 3.8 |
| 7 | 7.6 |
| 8 | 11.4 |
From the above observations, what conclusion do you draw about the melting point of ice?
State the melting point of ice.
What are the changes of state in water? Explain.
Analogy:
Melting: ice into water on heating,
freezing: _______.
What is melting? Give example.
In an endothermic process, the speed of the molecules is ______ hence they move faster.
Sweating causes cooling because water has a ______.
