Question

The term $\frac{-dc}{dt}$ in a rate equation refers to:

• A. the decrease in concentration of the reactant with time
• B. the concentration of a reactant
• C. the change in concentration of the reactant
• D. the velocity constant of the reaction

Answer 1

Answer: (A)

the decrease in concentration of the reactant with time

Answer 2

$\frac{dc}{dt}$ represent the change in concentration of reactant with time. As, in a reaction, concentration of reactant always decrease with time hence, rate of reaction is represented as $\frac{-dc}{dt}$ .