What is k in the rate law equation?
Rate=k[A][B]
A. A pressure constant
B. A volume constant
C. A rate constant
D. An equilibrium constant
Answer (2)
The rate law equation is given as Rate = kAB.
'k' in the rate law equation represents the rate constant.
The rate constant is specific to a reaction at a particular temperature.
Therefore, the answer is OC .
Explanation
Understanding the Rate Law The rate law equation expresses the relationship between the rate of a chemical reaction and the concentrations of the reactants. In the given rate law, Rate = kAB, 'Rate' represents the speed at which the reaction occurs, A and B represent the concentrations of the reactants, and k is the proportionality constant.
Identifying the Rate Constant The constant 'k' in the rate law equation is known as the rate constant. It is specific to a particular reaction at a particular temperature and reflects the intrinsic speed of the reaction. It is not a pressure constant, a volume constant, or an equilibrium constant.
Conclusion Therefore, the correct answer is OC. A rate constant.
Examples
In a chemical manufacturing plant, understanding the rate constant (k) in a rate law equation is crucial for optimizing production. For instance, if a reaction Rate = k[A][B] describes the formation of a product, knowing 'k' allows engineers to predict how changes in reactant concentrations [A] and [B] will affect the production rate. This knowledge helps in adjusting conditions to maximize output, reduce waste, and maintain consistent product quality. By manipulating reactant concentrations based on the rate constant, the plant can efficiently meet production targets and minimize costs.
In the rate law equation Rate = k[A][B], 'k' denotes the rate constant, which determines the speed of the reaction at a specific temperature. Therefore, the correct answer is option C: a rate constant.
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