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Questions and Answers
What does the rate constant in a first-order reaction represent?
What is the meaning of the term 'half-life' in the context of reactions?
In the integrated rate equation, what does 'A' represent?
What is the order of a reaction if its rate is proportional to $[A]^2$?
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Which term represents the slope in a plot of $\ln[A]_t$ against time for a first-order reaction?
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If two reactants have different concentrations in a reaction, what is the order of this reaction?
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Study Notes
Rate of Disappearance/Appearance
- The rate of disappearance/appearance is represented by -dC/dt or dC/dt, where C is the concentration of the reactant.
Integrated Rate Equation
- The integrated rate equation for a reaction is given by C = C0 * e^(-kt), where C is the concentration of the reactant at time t, C0 is the initial concentration, and k is the rate constant.
First-Order Reaction
- A first-order reaction is a reaction whose rate depends on the concentration of one reactant.
- The rate equation for a first-order reaction is given by -dC/dt = k * C.
- The integrated rate equation for a first-order reaction is given by ln(C/C0) = -kt.
- The half-life of a first-order reaction is given by t1/2 = ln(2) / k.
Second-Order Reaction
- A second-order reaction is a reaction whose rate depends on the concentration of two reactants.
- The rate equation for a second-order reaction is given by -dC/dt = k * C^2.
- The integrated rate equation for a second-order reaction is given by 1/C - 1/C0 = kt.
Zero-Order Reaction
- A zero-order reaction is a reaction whose rate does not depend on the concentration of the reactant.
- The rate equation for a zero-order reaction is given by -dC/dt = k.
Reaction with Two Reactants
- The rate equation for a reaction with two reactants A and B is given by -dC/dt = k * [A]^m * [B]^n, where [A] and [B] are the concentrations of A and B, and m and n are the orders of reaction with respect to A and B.
Half-Life
- The half-life of a reaction is the time required for the concentration of the reactant to decrease to half of its initial value.
Rate Constant
- The rate constant (k) is a constant of proportionality that relates the rate of reaction to the concentration of the reactant.
Units of Rate Constant
- The units of the rate constant depend on the order of the reaction.
- For a first-order reaction, the units of k are s^-1.
- For a second-order reaction, the units of k are M^-1s^-1.
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Description
Test your knowledge of chemical reaction rate equations with this quiz! Questions cover topics such as average rate of reaction, reaction rate constants, and reaction order. See how well you understand the calculations involved in determining reaction rates.
