Chemistry
Rivers and lakes do not freeze easily because:
- Water does not contain matter like air, carbon dioxide and other minerals.
- Water is a universal solvent.
- Water has a high specific heat capacity and ice has a high latent heat of fusion.
- River water is fresh water.
Answer
Water has a high specific heat capacity and ice has a high latent heat of fusion.
Reason — Rivers and lakes do not freeze easily because the specific latent heat of fusion of ice is sufficiently high (= 336 J g-1). The water in lakes and rivers will have to liberate a large quantity of heat to the surrounding before freezing. The layer of ice formed over the water surface, being a poor conductor of heat, will also prevent the loss of heat from the water of lake, hence the water does not freeze all at once
Related Questions
An element has 3 electrons in its M shell. It belongs to:
- Period 13, group 3
- Period III, group 3
- Period III, group III B
- Period III, group 13
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- Their electronic configuration is stable
- They are non-supporters of combustion
- They are liquefied with great difficulty
- They do not react
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Cl2 + 2KBr ⟶ 2KCl + Br2
- Single displacement reaction
- Double displacement reaction
- Combination reaction
- Halogen reaction
You are provided with a Periodic Table below :
(i) What is this Periodic table known as?
(ii) Give the Periodic Law for the above Periodic table.
(iii) From the above Periodic table, predict the formula for the (i) oxide and (ii) hydride of Sulphur (S).
(iv) State one defect of this table.
(v) What is the basis of the Modern periodic table?