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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 8

Water is used as a cooling agent.

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प्रश्न

Water is used as a cooling agent.

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उत्तर

Water has high specific heat. Water neither heats up nor cools down quickly. This property makes water an excellent cooling agent.

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Anomalous Expansion of Water
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 8: Water - Exercise I [पृष्ठ १०७]

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सेलिना Concise Chemistry [English] Class 8 ICSE
अध्याय 8 Water
Exercise I | Q 6.1 | पृष्ठ १०७

संबंधित प्रश्न

Give reasons:

Water pipes burst in severe winters.


On a winter day the temperature of the tap water is 20°C whereas the room temperature is 5°C. Water is stored in a tank of capacity 0.5 m3 for household use. If it were possible to use the heat liberated by the water to lift a 10 kg mass vertically, how high can it be lifted as the water comes to the room temperature? Take g = 10 m s−2.


Consider the situation of the previous problem. Assume that the temperature of the water at the bottom of the lake remains constant at 4°C as the ice forms on the surface (the heat required to maintain the temperature of the bottom layer may come from the bed of the lake). The depth of the lake is 1.0 m. Show that the thickness of the ice formed attains a steady state maximum value. Find this value. The thermal conductivity of water = 0.50 W m−1°C−1. Take other relevant data from the previous problem.


A calorimeter contains 50 g of water at 50°C. The temperature falls to 45°C in 10 minutes. When the calorimeter contains 100 g of water at 50°C, it takes 18 minutes for the temperature to become 45°C. Find the water equivalent of the calorimeter.


Draw a graph between volume and temperature, when 5 cm3 of ice at -10°C is heated to form water at +10°C.


Write a short note on Land Breeze and Sea Breeze.

On a faulty thermometer, a lower fixed point is marked at 10°C and upper fixed point is marked as 130°C. What will be the reading on this thermometer when it is placed in a liquid which is actually at 40°C?

Explain the 'anomalous expansion' of water.

When the temperature of water decreases below 4 °C it’s volume _______.


Observe the given picture and answer the following questions.

  1. Which property do you understand in this picture?
  2. What is the temperature of the water at the surface?
  3. What is the temperature below the layer of ice on the surface?

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