Question

calcium metal react with water

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Answer 1

Answer:

Reaction of calcium with water

Calcium reacts slowly with water. ... The reaction forms calcium hydroxide, Ca(OH)2 and hydrogen gas (H2). The calcium metal sinks in water and after an hour or so bubbles of hydrogen are evident, stuck to the surface of the metal.

Ca + H2O =======> Ca(OH)2

i) Cinnabar is heated in air

2HgS + 3O2(g)=>2HgO(s) + 2SO2

ii) Calcium metal reacts with water.

Ca(s)+2H2O(l)=>Ca(OH)2(aq)+H2

(g).

(a) When manganese dioxide (MnO2) is heated with aluminium powder, displacement reaction takes place, and manganese is obtained as the product along with aluminium oxide. It is an exothermic reaction and hence Mn is obtained in molten form.

3MnO2(s) + 4Al(s) → 3Mn(l) +

2Al2O3(s) + heat

Answer 2

Answer:

ca +H2O=cao+H2

Explanation:

here calcium react s with water to form calcium oxide and hydrogen gas