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The Periodic Table
The Alkaline Earth Metals - Reaction with Oxygen (burning in air).
How do the Alkaline Earth Metals React with Oxygen?
earth metals all react quickly with oxygen.
Calcium is stored under oil to prevent oxygen
from reaching the surface and reacting with the bare metal.
and calcium will both burn in air
to give the corresponding oxides (see below).
They are sometimes used in the chemicals in fireworks.
How does Magnesium React with Oxygen?
burns in air with a brilliant white flame
to form magnesium oxide. Magnesium oxide is a base.
oxygen magnesium oxide.
2Mg(s) + O2(g) 2MgO(s)
How does Calcium React with Oxygen?
Calcium burns in air with a red flame to form calcium oxide.
oxygen calcium oxide
2Ca(s) + O2(g) 2CaO(s)
Calcium oxide is
alkaline. Calcium oxide reacts with water
to form calcium hydroxide (slaked lime).
See also the manufacture and uses of lime.
calcium oxide + water
CaO(s) + H2O(l) Ca(OH)2(s)
Although calcium hydroxide is
written as solid (s), it is sparingly
soluble in water (it dissolves a little). The solution is
called lime water and is used in the test for carbon dioxide gas.
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