At start of reaction the concentration of reactants is_______________?
Correct answer: A. high
- A. high
- B. low
- C. according to Kc
- D. constant
Explanation
At the beginning of a reaction containing reactants, their concentration is taken as high relative to the products, which may initially be absent or present in a smaller amount. The concentrations then change until dynamic equilibrium is reached. The likely mistake is choosing constant because concentrations become constant at equilibrium, not at the start.
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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.
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