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Science · Chemistry

Hard Chemistry Drill

15 hard-difficulty ACT Science questions on Chemistry. Each question is on its own page with a worked answer explanation, the underlying rule, and a quick study tip.

Hard Science Chemistry

All 15 questions

  1. 1 Metabolic-Rate Table — Question 1 Read Table 1 and answer. Hard
  2. 2 Metabolic-Rate Table — Question 2 Read Table 1 and answer. Hard
  3. 3 Metabolic-Rate Table — Question 3 Read Table 1 and answer. Hard
  4. 4 Metabolic-Rate Table — Question 4 Read Table 1 and answer. Hard
  5. 5 Metabolic-Rate Table — Question 5 Read Table 1 and answer. Hard
  6. 6 Metabolic-Rate Table — Question 6 Read Table 1 and answer. Hard
  7. 7 Metabolic-Rate Table — Question 7 Read Table 1 and answer. Hard
  8. 8 Metabolic-Rate Table — Question 8 Read Table 1 and answer. Hard
  9. 9 Metabolic-Rate Table — Question 9 Read Table 1 and answer. Hard
  10. 10 Metabolic-Rate Table — Question 10 Read Table 1 and answer. Hard
  11. 11 Metabolic-Rate Table — Question 11 Read Table 1 and answer. Hard
  12. 12 Metabolic-Rate Table — Question 12 Read Table 1 and answer. Hard
  13. 13 Metabolic-Rate Table — Question 13 Read Table 1 and answer. Hard
  14. 14 Metabolic-Rate Table — Question 14 Read Table 1 and answer. Hard
  15. 15 Metabolic-Rate Table — Question 15 Read Table 1 and answer. Hard

How to use this drill

Open the questions one at a time. Read the prompt, decide on an answer before scrolling, then check the explanation. The point of a drill is not to "get the question right" — it's to internalize the rule so you can apply it cold under timed conditions on test day.

If you're missing more than a third of the questions in this set, drop down a difficulty tier and rebuild from there. If you're getting all of them quickly, jump up a tier and try a mixed drill across subtopics.

What "Hard" means here

Hard questions are designed to separate strong test-takers. They typically require multiple rules applied in sequence, or careful elimination among answers that all look plausible. Expect to see these appear later in real ACT sections; even strong test-takers miss a couple per test.

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