A chemical system is said to be in dynamic equilibrium when
Correct answer: B. the forward and reverse reactions continue at equal rates
- A. both reactions have stopped completely
- B. the forward and reverse reactions continue at equal rates
- C. the amounts of reactants and products are equal
- D. all the reactants have been converted to products
Explanation
The word dynamic means both reactions are still running; they simply cancel out, so the concentrations stay constant while molecules continue to convert in both directions. Equal concentrations of reactant and product are not required and are usually not the case, which is the standard misconception. Equilibrium can only be reached in a closed system.
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About Reversible Reactions
A reversible reaction proceeds in both forward and backward directions, so reactants and products continue changing until dynamic equilibrium is established. The topic covers the meaning of equilibrium, the equality of forward and reverse rates, and how concentration, pressure and temperature disturb equilibrium, which is separate from the rate at which equilibrium is reached.
Practise Chemical Equilibrium
625 free Chemical Equilibrium MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
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