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About This Drill
ACT Science — Research Summaries — Drill 3 is a Science practice drill covering Research Summaries. It contains 5 original questions created by Brian Stewart, a Barron's test prep author with over 20 years of tutoring experience.
ACT Research Summaries questions test your ability to analyze multiple experiments and draw conclusions about experimental design. This drill presents three experiments on enzyme-catalyzed decomposition of hydrogen peroxide, varying H₂O₂ concentration, pH, and catalase concentration across the three studies.
Questions in This Drill
- According to Table 2, at which pH was the catalase reaction rate the highest?
- Which variable was held constant in all three experiments?
- Both Experiments 1 and 3 show reaction rate increasing as concentration increases, but with different behavior at high concentrations. Which of the following best describes this difference?
- A student wants to maximize the reaction rate using 3% H₂O₂ and pH 7. Based on Experiment 3, approximately what catalase concentration would she need to roughly double the rate observed at 0.5% catalase?
- In Experiment 3, the students included a trial with 0.0% catalase. What was the most likely purpose of this trial?