Displacement Reactions of Metals
More reactive metals displace less reactive metals from the compounds
Water
Reactive metals such as potassium,sodium and lithium react vigorously with water forming the metal hydroxide and hydrogen.
Sodium floats on water, moves over the surface of water and effervesces. In addition to these observations if potassium is used a lilac flame is observed. The reaction is highly exothermic causing the metal to melt and become spherical
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