At the start of a reaction, the concentration of reactants decreases _.
Correct answer: C. Rapidly
- A. Slowly
- B. At a constant rate
- C. Rapidly
- D. Exponentially
Explanation
OPTION A: At the start of a reaction, the concentration of reactants decreases quickly because the reaction rate is proportional to the concentration of reactants, and the reaction rate increases as the concentration of reactants increases.OPTION B: The rate of a reaction depends on the collision of reactant molecules, and the frequency and strength of those collisions are influenced by factors such as temperature, concentration, and surface area, leading to a non-constant decrease in reactant concentration.OPTION C: Typically, reaction rates decrease with time because reactant concentrations decrease as reactants are converted to products.OPTION D: The decrease in reactant concentration at the start of a reaction is not necessarily exponential because the rate of reaction depends on various factors such as temperature, concentration, and catalysts which can cause fluctuations in the rate of decrease.
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About Chemical Equilibrium
Reversible reactions reach dynamic equilibrium when forward and reverse rates become equal, and Le Chatelier's principle predicts the effect of changing concentration, pressure or temperature. The chapter also covers solubility product, the common ion effect, buffer action and the conditions used in Haber's process, with equilibrium shifts distinguished from changes in the equilibrium constant.
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