The change in concentration of reactants or products per unit time is called rate of reaction. The rate of reaction:
Correct answer: B. The rate of reaction decreases as the reaction proceeds
- A. The rate of reaction increases as the reaction proceeds
- B. The rate of reaction decreases as the reaction proceeds
- C. The rate of reaction remains the same as the reaction proceeds
- D. The rate of reaction may decrease or increase as the reaction proceeds
Explanation
The rate of reaction typically decreases as the reaction progresses due to the depletion of reactants and the accumulation of products. This results in fewer effective collisions between reactant molecules, thus slowing the reaction rate. Option A is incorrect because the rate usually does not increase without external influences. Option C is incorrect because the rate of reaction does not remain constant due to changing concentrations. Option D is misleading without additional context, as natural progression generally leads to a decrease in rate.
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About Reaction Kinetics
Reaction kinetics relates reaction rate to concentration, temperature, surface area and catalysts. Questions cover rate laws, reaction order, rate constants, activation energy and the activated complex, including how a catalyst lowers the activation energy without changing the overall energy change or equilibrium position.
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