5. Which of the following compounds will show the precipitation when adding AgNO₃? (A) HF (B) K₂SO₄ (C) NaCl (D) Ca(OH)₂

9. Equilibrium is reached in chemical reactions when: (A) The rates of the forward and reverse reactions become equal. (B) The concentrations of reactants and products become equal. (C) The temperature shows a sharp rise (D) All chemical reactions stop. (E) The forward reaction stops.