alleryStart learning →What does the rate of a chemical reaction measure?
AThe change in amount of a reactant or product per unit time
BThe total amount of product formed once the reaction ends
CThe energy released by the reaction per unit of time
DThe number of moles of catalyst used up per unit time
Answer & Solution
Correct answer: A. The change in amount of a reactant or product per unit time
1. A rate is any measure of how a property varies with time.
2. For a chemical change the property watched is the amount of a reactant or of a product.
3. So the reaction rate is the change in that amount divided by the time taken.
4. The final yield, the heat given out and the catalyst amount are separate quantities and none of them is a rate.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 12 "Kinetics", section 12.1 Chemical Reaction Rates_
Keep practising Kinetics
Browse all Kinetics questions for IMU CET, or explore more Chemistry topics.
Related questions
Which enzyme deficiency is described as the most common one in humans?Why are most catalytic converters preheated by an electric heater?Which catalyst coats the surface of most modern three way catalytic converters?Which international treaty began phasing out chemicals linked to ozone destruction?Which prize did Paul Crutzen, Mario Molina and Sherwood Rowland share for their work on ozNitric oxide takes part in the decomposition of ozone. Why is it called a catalyst?On a reaction diagram the reagents sit at 6 kJ and the transition state at 20 kJ. What is What effect does a catalyst have on the position of an equilibrium?