If more HCl is added to the system, how will the reactions shift to reach equilibrium again, chemistry homework help

• 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 CO₂ is 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?

CaCO₃ (s) + 2HCl (g) ↔ CaCl₂ (s) + H₂O (l) + CO₂ (g) ∆H = –90 kJ/mol

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