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Why do lakes freeze from top towards bot...

Why do lakes freeze from top towards bottom ?

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Given reasons (i) Lakes freeze form top towards bottom. (ii) Ice floats on water.

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ICSE-HYDROGEN-SHORT ANSWER TYPE QUESTIONS
  1. Write two reactions to explain amphoteric nature of water .

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  2. What is meant by hydrogen economy?

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  3. Explain the correct context in which the following terms are used: ...

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  4. Explain the correct context in which the following terms are used: d...

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  5. Explain the correct context in which the following terms are used: p...

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  6. Explain the correct context in which the following terms are used: h...

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  7. Is it correct to say that hydrogen can behave as a metal? If it is cor...

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  8. Write a short note on the isotopes of hydrogen.

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  9. Does hydrogen show allotropy? How many allotropes of dihydrogen are kn...

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  10. Name the class of hydrides to which H(2)O, B(2)H(6), NaH and LaH(3) be...

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  11. Hydrogen forms three types of bonds in its compounds. Giving suitable ...

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  12. Elements with atomic numbers 17 and 20 form compounds with hydrogen. W...

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  13. What is the difference between the terms ‘hydrolysis’ and ‘hydration’ ...

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  14. What is meant by hydrogenation?

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  15. What are tHe advantages in using hydrogen as a fuel ?

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  16. Why are ionic hydrides frequently used to remove traces of water from ...

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  17. Although D(2)O resembles H(2)O chemically, yet it is a toxic substance...

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  18. Why is ice less dense than water and what kind of attractive forces mu...

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  19. Describe some unusual properties of water.

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  20. Why do lakes freeze from top towards bottom ?

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