K
Melts to form a silvery ball, which moves about very quickly on the water surface with a hissing sound, and it burns with a lilac flame.
Na
Sodium reacts with cold water in a similar way as potassium, but less vigorously. Burns with a golden yellow flame.
Ca
Sinks to the bottom. Colorless gas bubbles form at a moderate rate, and it burns with a ‘pop’ sound when being tested with a burning splint. Calcium granule gradually decreases in size and eventually disappears. A milky suspension is produced.
Mg (With Steam)
Magnesium has almost no reaction with cold water, but it reacts slowly with hot water to give magnesium oxide and hydrogen.
When having a reaction with steam, magnesium gives an intense light, and a white solid forms.
Al, Zn and Fe（with steam）
Zinc, iron and aluminum(without aluminum oxide layer) do not react with cold or hot water, but react with steam only.
Reaction of metals and steam
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