Practice Half-life Of A Reaction (4.7) - Chapter 4: Chemical Kinetics

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6 sample questions

Question 1.
Define half-life in your own words.
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Think about what happens to reactant amounts over time.
Question 2.
What is the equation for calculating half-life in first-order reactions?
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Recall the formula given earlier.
3Question 3.
What is the definition of half-life in chemical reactions?
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Think about the meaning of 'half-life' as two parts.
4Question 4.
For first-order reactions, is half-life dependent on the initial concentration?
- True
- False
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Recall our discussion about constant half-life.
Question 5.
A hypothetical drug has a half-life of 3 hours. If a patient takes 50 mg at 8 AM, how much of the drug remains in their system at 2 PM?
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Remember to count the number of half-lives.
Question 6.
For a certain reaction with a half-life of 5 days, if you start with 80 grams of a reactant, how much remains after 15 days?
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Calculate how many half-lives fit into 15 days.

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