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Write equations for the reactions of C...

Write equations for the reactions of
Calcium and potassium with water

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The reaction of calcium with water is exothermic but the heat evolved is not sufficient for the hydrogen to catch fire.
`Ca(s) + 2H_(2)O(I) rarr Ca(OH)_(2)(aq) + H_(2)(g) + "Heat"`
Calcium starts floating because the bubbles of hydrogen gas formed stick to the surface of the metal.
Potassium react violently with cold water and its reaction is so violent and exothermic that the evolved hydrogen immediately catches fire.
`2K(s) + 2H_(2)O(I) rarr 2KOH(aq) + H_(2)(g) + "Heat"`
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OSWAL PUBLICATION-METALS AND NON-METALS-NCERT Corner (Intext Questions)
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  9. Write the electron dot structures of sodium, oxygen and magnesium.

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  10. Show the formation of Na(2)O and MgO by the transfer of electrons.

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  11. What are the ions present in these compounds? Na(2)O and MgO.

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  12. Why do ionic compounds have high melting points?

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  14. Define the following terms. Ore

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  15. Define the following terms. (i) Mineral (ii) Ore (iii) Gangue

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  16. Name two metals which are found in nature in the free state.

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  17. What chemical process is used for obtaining a metal from its oxide?

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  20. What are alloys?

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