# Chapter 10 Chemical Reactivity - Problems - Page 346: 81

(a) H$_{2}$SO$_{4}$ + CaCO$_{3}$ → CaSO$_{4}$ + CO$_{2}$ + H$_{2}$O (b) Sn + 2HCl → SnCl$_{2}$ + H$_{2}$ (c) 2Mg + O$_{2}$ → 2MgO

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