Which of the following is true about a system at equilibrium? A. The concentration(s) of the reactant(s) is equal to the concentration(s) of the product(s). B. No new product molecules are formed. C. The concentration(s) of reactant(s) is constant over time. D. The rate of the reverse reaction is equal to the rate of the forward reaction and both rates are equal to zero. E. The rate of the reverse reaction is at its maximum when the reactants are first mixed.

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Q: 4. Does an irreversible reaction go to completion? 5. What do you mean by equilibrium?

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Q: What effect, if any, would increasing the pressure have on the equilibrium?

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