can anyone send me the notes of the chapter of water from chemistry...pls..pls...pls class : 9..pls..pls..pls..pls...pls ..
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Chemical Properties of Water
Sodium and potassium
React violently with cold water.
Highly exothermic reaction.
Released hydrogen immediately catches fire.
K + H2O → 2KOH + H2↑ + heat
Na + H2O → 2NaOH + H2↑ + heat
Calcium
Less violent reaction with water, the heat evolved is not enough for H2 to catch fire.
Ca + 2H2O → Ca(OH)2 + H2↑
Ca starts floating as bubbles of H2 stick to metal surface
Magnesium
Reacts with hot water, starts floating due to H2bubbles sticking to it.
Mg + 2H2O → Mg(OH)2 + H2↑
Aluminium, Zinc, Iron (reversible reaction with steam)
React with steam to form oxide and hydrogen
2Al + 3H2O → Al2O3 + 3H2↑
Zn + H2O → ZnO + H2
3Fe + 4H2O ↔ Fe3O4 + 4H2↑
Copper, Gold, Platinum No reaction with water
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