Physical Science A Semester Exam 23 of 3323 of 33 Items Question Calcium oxide and carbon dioxide combine to form calcium carbonate in the reversible reaction: CaO + CO2 ⇌ CaCO3 When the reaction is at dynamic equilibrium, which statement must be true? (1 point) Responses The forward and reverse reactions have stopped. The forward and reverse reactions have stopped. The concentration of calcium carbonate is increasing. The concentration of calcium carbonate is increasing. Calcium carbonate and calcium oxide are formed at the same rate. Calcium carbonate and calcium oxide are formed at the same rate. The reaction has run out of carbon dioxide or calcium oxide. The reaction has run out of carbon dioxide or calcium oxide. Skip to navigation page 1 of 1