Specific Rate Constant MDCAT Quiz: as it is a central factor in determining the rate of any chemical reaction. The specific rate constant (k) refers to a proportionality constant in the expression of the rate law that connects the rate of a reaction with the concentrations of the reactants. One needs to know how to determine and apply the rate constant while solving problems of reaction rates and order of reaction in MDCAT Quiz questions.
Understanding the Specific Rate Constant
The specific rate constant (k) is specific to each reaction and is influenced by temperature. It reflects the relationship between the concentration of reactants and the rate of the reaction. For a reaction with the rate law: rate = k[A]^m[B]^n, constant k is an experimentally determined constant. The units of the rate constant depend upon the order of the reaction; for a first-order reaction, units of k are s⁻¹, whereas for a second-order reaction, units are M⁻¹s⁻¹. MDCAT students have to learn how to determine the units of the rate constant and how to use the rate law in determining the value of k for different reactions.
The Effect of Temperature on k
The specific rate constant also depends on temperature, and its value increases with temperature for most reactions. This dependence is described by the Arrhenius equation, which connects the rate constant with activation energy and temperature. It is important to understand how temperature affects the specific rate constant for MDCAT students since MDCAT Quiz questions may ask you to calculate k at different temperatures or, using the Arrhenius equation, solve related problems. Free Flashcard resources can help in the reinforcement of these concepts and their applications.
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The specific rate constant is the key to success in MDCAT, especially in the reaction kinetics section of the exam. Using MDCAT Quiz and Free Flashcard tools will help a student strengthen their understanding of rate laws, rate constants, and the relationship between temperature and rates of reaction.
The specific rate constant (k) is a proportionality factor in the __________ equation.
rate
The units of k depend on the __________ of the reaction.
order
The specific rate constant is __________ for a given reaction at a constant temperature.
constant
For a first-order reaction, the unit of k is __________.
s⁻¹
For a second-order reaction, the unit of k is __________.
L mol⁻¹ s⁻¹
The rate constant increases with __________ temperature.
increasing
The specific rate constant is independent of __________.
concentration
The value of k provides information about the __________ of the reaction.
speed
The rate constant for a reaction can be calculated using the __________ equation.
Arrhenius
The specific rate constant is influenced by the __________ energy.
activation
A reaction with a high k value is __________.
fast
The specific rate constant depends on the __________ of the catalyst.
presence
For a zero-order reaction, the unit of k is __________.
mol L⁻¹ s⁻¹
The rate constant for a reaction is directly proportional to the __________ of successful collisions.
number
The specific rate constant (k) is derived from the __________ law.
rate
The specific rate constant varies with __________.
temperature
For a second-order reaction, the rate is proportional to the __________ of two reactants.
product
The magnitude of k indicates the __________ of a chemical reaction.
speed
The specific rate constant (k) is __________ in the rate law expression.
included
The rate law is expressed in terms of k and the __________ of reactants.
concentration
The value of k decreases as the activation energy __________.
increases
The rate constant for a reaction at two different temperatures can be compared using the __________ equation.
Arrhenius
The Arrhenius equation relates k to temperature and __________ energy.
activation
The units of k for a third-order reaction are __________.
L² mol⁻² s⁻¹
The specific rate constant is affected by the __________ of the medium.
nature
In a first-order reaction, k is equal to the slope of a graph of __________ vs. time.
ln(concentration)
The rate constant is higher for __________ reactions.
exothermic
The value of k for a reaction depends on the __________ path taken.
reaction
A low value of k indicates a __________ reaction.
slow
The specific rate constant can change with the addition of a __________.
catalyst
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