4.1.1 - Method of Initial Rates
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Practice Questions
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What is the purpose of measuring the initial rate of a reaction?
💡 Hint: Consider why we measure right at the beginning of the reaction.
If doubling the concentration of a reactant quadruples the rate, what is the order of that reaction with respect to that reactant?
💡 Hint: Reflect on the relationship between concentration change and rate change.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is the main purpose of the method of initial rates?
💡 Hint: Think about the importance of knowing how each reactant affects rates.
In a rate law, what does the exponent on the concentration term represent?
💡 Hint: Recall the general format of a rate law.
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Challenge Problems
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Given a reaction A + B ⟶ C, you determine that when the concentration of A is doubled, the initial rate doubles; when the concentration of B is doubled, the rate increases by a factor of eight. Deduce the rate law for this reaction.
💡 Hint: Use the changes in rates to find each 'n' and 'm' separately.
A mixture of reactants produces a gas that accumulates in a flask. You measure that the initial rate of production is 0.1 mL/s for [A] = 0.1 M and [B] = 0.2 M. If you increase [A] to 0.2 M while keeping [B] constant and the rate increases to 0.4 mL/s, what is the order of reaction with respect to A?
💡 Hint: Relate concentration changes directly to how the rate changes.
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