We’re asked to write a balanced chemical equation for the reaction of Calcium hydride and water to form calcium hydroxide (aqueous) and hydrogen gas.
Recall that when balancing chemical equations, we have to make sure that the number of elements on both sides is equal with the lowest whole number coefficients.
Before balancing the chemical reaction, let’s first write the chemical formula of the compounds involved in the reaction.
Calcium hydride: CaH2
▪ Calcium → Group 2A → +2 charge →Ca2+
▪ Hydride→ Hydrogen → Group 1A → -1 charge (when bonded to a metal) → H-
▪ Balance the charges of Ca2+ and H-→ exchange (criss-cross) the numbers of the charges
Calcium hydride reacts with water to form calcium hydroxide (aqueous) and hydrogen gas.
Write a balanced chemical equation for the reaction.
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