Ca + H2O = Ca(OH)2 + H2

Balanced Chemical Equation – Solution

Ca + 2H2O → Ca(OH)2 + H2

The coefficients show the number of particles (atoms or molecules), and the indices show the number of atoms that make up the molecule. New substances are formed as a result of the rearrangement of the original atoms. As a result of a chemical reaction, atoms of chemical elements do not disappear anywhere and new ones do not appear, their number remains unchanged – this follows from the law of conservation of mass of substances.

Chemical Reaction Information

Calcium + Water = Portlandite + Tritium

This is an oxidation-reduction (redox) reaction. H2O is an oxidizing agent, Ca is a reducing agent.

  • 2 HI + 2 e  2 H0 (reduction)
  • Ca0  2 e  CaII (oxidation)

Reaction Type

Single Displacement (Substitution)

Substances that react are called starting materials or reactants. The substances that form as a result are called reaction products.



  • Names: Calcium.
  • Appearance: Silvery-white-to-grey powder.

H2O – Water, oxidane

  • Other names: Water (H2O), Hydrogen oxide, Hydrogen hydroxide.
  • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas.


Ca(OH)2 – Calcium hydroxide


  • Names: Dihydrogen, Hydrogen.
  • Appearance: Odourless colourless compressed gas.
Similar Examples of Equalizing a Chemical Reaction
H2O + Ca → O2 + CaH2
H2O + Ca → H2 + CaOH
H2O + Ca → H2 + Ca(OH)2
H2O + Ca → H2 + Ca(OH)2OH
H2O + O2 + Ca → H2 + Ca(OH)2
H2O + Ca → H2 + Ca(OH)
H2O + Ca → CaOH2
H2O + Ca → H2 + CaO
H2O + Ca → H2 + OH:- + Ca:2+

Alexander Stephenson

Candidate of Chemical Sciences, editor-in-chief of Lecturer at several international online schools, member of the jury of chemistry competitions and author of scientific articles.

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