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The above chemical equation represents the reaction between calcium sulfide (CaS) and hydrogen (H2), resulting in calcium (Ca) and hydrogen sulfide (H2S). The reaction ratio is 1 mol of CaS reacts with 2 mol of H2 to produce 1 mol of Ca and 1 mol of H2S.
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Reaction conditions: This reaction usually occurs at high temperature and high pressure.
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Reaction process: When heated with hydrogen, calcium sulfide decomposes, yielding calcium and hydrogen sulfide.
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Phenomena occurring: When the reaction takes place, one can observe changes in color, temperature, and volume of the reactants. The generated hydrogen sulfide has a characteristic foul smell.