SAT II Chemistry Exam Prep

Category - General Chemistry

A chemist hypothesizes that a newly developed photodegradable plastic will degrade twice as fast as currently available photodegradable plastics. Which of the following investigations would best test this hypothesis?
  1. Modeling the chemical reactions involved in the degradation of the new plastic and using this model to project degradation rates under different environmental conditions.
  2. Subjecting the new plastic and the existing plastics to the same environmental conditions and measuring their degradation rates.
  3. Comparing the degradation rate of the new plastic with the degradation rates provided by the manufacturers of the existing photodegradable plastics.
  4. Exposing the new photodegradable plastic to conditions of constant UV radiation and no UV radiation and comparing the resulting degradation rates.
Explanation
Correct Response: B. The environmental conditions are controlled, and the comparison stated is correct and sufficient to answer the question as to which plastic degrades more quickly. A is incorrect because the two plastics are not compared and degradation rates are theoretical. C is incorrect because degradation rates provided by the manufacturer may be biased and also because the degradation rates of the two types of plastic were likely measured using different environmental conditions. D is incorrect because the experiment in this option only involves one type of plastic.
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