Chemistry Reaction Kinetics UHS 2023
PMDC Verified Question 14 of 80
The rate of reaction between two specific time intervals is called?
A
Average rate of reaction
B
Instantaneous rate of reaction
C
Rate of reaction
D
Initial rate
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Average rate of reaction
Concept:

Rates of reaction can be measured over a finite duration or at an exact, specific moment in time.

Formula:

$$ \text{Average Rate} = \frac{\Delta [\text{Concentration}]}{\Delta t} = \frac{C_2 - C_1}{t_2 - t_1} $$

Solution:

  • When the rate is calculated over a macroscopic, finite period of time (between two specific, separated time intervals \( t_1 \) and \( t_2 \)), it is called the average rate of reaction.
  • It provides the overall speed of the reaction during that specific window, even if the rate fluctuated during it.


Why other options are incorrect:

Instantaneous rate is measured at a single infinitesimal moment (using the derivative \( dC/dt \)). Initial rate is the instantaneous rate specifically at \( t = 0 \).

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