Question

What is the balanced equation when calcium + water gives calcium hydroxide + hydrogen?

Answer 1

Calcium reacts slowly with water. This is in contrast with magnesium, immediately above calcium in the periodic table, which is virtually unreactive with cold water. The reaction forms calcium hydroxide, Ca(OH)2 and hydrogen gas (H2).

Ca (s) + 2H2O (g) → Ca(OH)2 (aq) + H2 (g)

Answer 2

Ca + 2H2O = Ca(OH) 2 + H2