Practice First-order Reactions (4.3.2) - Unit 6: Chemical Kinetics

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6 sample questions

Question 1.
What defines a first-order reaction?
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Focus on how many reactants affect the rate.
Question 2.
What is the half-life formula for first-order reactions?
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Recall how to derive the half-life expression.
3Question 3.
What is the rate equation for a first-order reaction?
- Rate = k[A]
- Rate = k[A]^2
- Rate = k[A][B]
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Consider the power of the concentration in the rate law.
4Question 4.
The half-life for a first-order reaction depends on the initial concentration.
- True
- False
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Recall the properties of half-lives for different reaction orders.
Question 5.
A reaction has a rate constant of 0.03 s⁻¹. If 1 mole of the substance is present at t=0, how long will it take for 90% of it to decay? What will be the concentration at that time?
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Use the integrated first-order rate law.
Question 6.
A pharmacologist discovers a drug with a half-life of 3 hours. If a patient receives an initial dose of 120 mg, how much will remain after 9 hours?
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Apply the concept of halving the amount every half-life.

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