The liquid form of water converts into gaseous from in steam. Its particles move very rapidly in the directions and fill the kitchen as gases completely fills the vessel.
Question
A small volume of water in a kettle can fill a kitchen with steam’. Explain why.
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Mrs. Khanna was making breakfast in kitchen. For this purpose she was heating water in a pan. In the meantime, her 12 years old son, Pappu entered the kitchen and saw the water vapour coming out from the pan. Pretend yourself to be Mrs. Khanna and answer the following questions: (𝒊) What is the process going on in the pan? (𝒊𝒊) Why was this process occurring? (𝒊𝒊𝒊) Give one way by which Pappu can relate this phenomenon with his everyday life. (𝒊𝒗) What values are shown by Pappu?
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The temperature-time graph given alongside shows the heating curve for pure wax. From the graph answer the following: (a) What is the physical state of the substance at the point A, B, C and D? (b) What is the melting point of the substance? (c) What is the boiling point? (d) Which portions of the graph indicates that change to state is taking place? (e) Name the terms used for heat absorbed during change of states involved in above process.
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You are given the following substances with their melting and bowling points. Identify the physical status of X, Y and Z at room temperature (30°C).
| Substance | Melting point(°C) | Boiling point(°C) |
| X | -219 | -183 |
| Y | 119 | 445 |
| Z | -15 | 78 |
Comment on the following statements Evaporation causes cooling. (b) Rate of evaporation of an aqueous solution decreases with increase in humidity. (c) Sponge though compressible is a solid. (d) Ice is solid at 0°C, while water is liquid at room temperature. (e) Sugar crystals dissolve faster in hot water than cold water.
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