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Praxis II Middle School Content Knowledge Test Prep

Category - Praxis Middle School Content Knowledge Practice Test

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The half-life of 14 grams of a substance is 3 hours. How many grams of the substance remain after 6 hours?
  1. 3.5 grams
  2. 7.0 grams
  3. 14 grams
  4. 28 grams
  5. 7.5 grams
Explanation
Answer: 3.5 grams

The half-life of a substance is the amount of time required for that substance to decay to half of its original mass. In the context of this question, 6 hours represents two half-lives. Therefore, the substance will decay to one-fourth of its original mass, or 3.5 grams.
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