In rate expression the concentration of reactants is negative. It shows_______________?
Correct answer: C. Concentration of reactant decreases
- A. Concentration of reactant does not change
- B. Concentration of product increases
- C. Concentration of reactant decreases
- D. Concentration of reactant increases
Explanation
A negative sign before a reactant concentration change shows that the reactant is being consumed, so its concentration decreases with time. Students may choose b because products increase, but the negative sign specifically refers to the decreasing reactant term, not the positive product term.
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About Rate of Reaction
Reaction rate measures the change in concentration of a reactant or product per unit time. Questions connect rate with concentration, temperature, pressure, surface area, catalysts and nature of reactants, and may involve rate laws, reaction order, activation energy and collision theory. Rate describes speed, whereas equilibrium describes the final balance of opposing reactions.
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