Answer
(a) Sr(s) + S(s) → SrS(s) Strontium Sulfide
(b) 2 K(s) + 2 H$_{2}$O(l) → 2 KOH(aq) + H$_{2}$(g) Potassium Hydroxide + Hydrogen
(c) Ca(s) + 2 H$_{2}$O(l) → Ca(OH)$_{2}$(aq) Calcium Hydroxide
(d) 2 Al(s) + 3 Cl$_{2}$(g) → 2 AlCl$_{3}$(s) Aluminum Chloride
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