The Periodic Table
The Alkaline Earth Metals - Reaction with Water.
How does Magnesium React with Water?
Magnesium will not
react with cold
Even finely powdered magnesium reacts only very slowly.
Magnesium will react
with gaseous water (steam) to
form magnesium oxide and hydrogen gas.
You must know how to test for hydrogen gas.
+ steam magnesium oxide + hydrogen.
Mg(s) + H2O(g) MgO(s) + H2(g)
Magnesium oxide is a base. It will not dissolve in water.
How does Calcium React with Water?
Calcium (and the metals below calcium
in group 2)
will react with cold water. They will sink
as they react, unlike the group 1 metals which float.
calcium + water
hydroxide + hydrogen.
Ca(s) + 2H2O(l) Ca(OH)2(s) + H2(g)
Calcium hydroxide is
called slaked lime. Calcium hydroxide will
dissolve a little in water to form lime water (see the previous page).
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