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  • The reaction below occurs in a closed system. The reactants were mixed and the reaction was allowed to reach equilibrium.
    • Is this reaction a single replacement or a double replacement? Explain your answer.
    • If more HCl is added to the system, how will the reactions shift to reach equilibrium again?
    • If CO 2is removed from the system, how will the reactions shift to reach equilibrium again?
    • If heat is added to the system, how will the reactions shift to reach equilibrium again?
    • What is the principle that helps identifies shifts in equilibrium?

CaCO 3(s) + 2HCl (g) ↔ CaCl 2(s) + H 2O (l) + CO 2(g) ∆H = –90 kJ/mol

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