Question

6) Ca + ? -> Ca(OH)2 + ?;​

Answer 1

Ca + 2 H2O → Ca(OH)2 + H2

Answer 2

The chemical equation you've provided is incomplete. To balance it and provide the missing reactant and products, we need more information. A balanced chemical equation should include the chemical formulas of all reactants and products, as well as the coefficients that indicate the relative quantities of each substance involved.

If you have specific reactants and products in mind, please provide their chemical formulas or names, and I'd be happy to help you balance the equation.