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ACT Science Practice Questions - ACT Science Section (Enhanced ACT 2025) Exam

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About this Exam

Prepare with the ACT Science Practice Questions - ACT Science Section (Enhanced ACT 2025) Exam practice quiz. This question bank includes 100 questions covering experiment, shows, student, figure, and water. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

Sample Questions

Question 1
Table 1 shows the solubility of four salts (in grams per 100 mL of water) at three temperatures: Salt | 20°C | 40°C | 60°C NaCl | 35.7 | 36.6 | 37.3 KNO3 | 31.6 | 63.9 | 110.0 Na2SO4 | 19.5 | 48.8 | 45.3 KCl | 34.0 | 40.0 | 45.5 Which salt shows the greatest increase in solubility between 20°C and 60°C?
NaCl
KNO3
Na2SO4
KCl
Question 2
Table 1 (from Question 1) shows the solubility of four salts at three temperatures. A student needs to dissolve 50 g of Na2SO4 in 100 mL of water. Based on Table 1, at which of the following temperatures is this most likely to succeed? Salt | 20°C | 40°C | 60°C Na2SO4 | 19.5 | 48.8 | 45.3
20°C, because Na2SO4 is most soluble at low temperatures
40°C, because solubility exceeds 50 g/100 mL at that temperature
60°C, because temperature always increases solubility
Any temperature, because Na2SO4 always dissolves completely
Question 3
Figure 1 shows a scatterplot of plant height (cm) versus amount of fertilizer applied (g/m²) for 20 tomato plants. The data show a positive linear trend from (0, 12) to (100, 62), with the equation of the best-fit line approximately: Height = 0.5 × (Fertilizer) + 12. Based on Figure 1, what is the predicted height of a tomato plant that receives 80 g/m² of fertilizer?
40 cm
52 cm
62 cm
72 cm
Question 4
A bar graph shows the average wingspan (cm) of five bird species: Species A: 45 cm Species B: 82 cm Species C: 61 cm Species D: 38 cm Species E: 95 cm A researcher claims that a wingspan above 60 cm is associated with longer migration distances. Based solely on the bar graph, how many species have wingspans consistent with this claim?
1
2
3
4
Question 5
Figure 2 shows two overlapping line graphs of atmospheric CO2 concentration (ppm) and average global surface temperature anomaly (°C) from 1960 to 2020. CO2 rises steadily from 317 ppm (1960) to 412 ppm (2020). Temperature anomaly rises from −0.1°C (1960) to +0.98°C (2020), with some year-to-year variability. Which of the following best describes the relationship between CO2 and temperature shown in Figure 2?
CO2 and temperature are inversely related over this period.
CO2 and temperature both generally increase over this period.
Temperature increased while CO2 remained stable.
CO2 increased while temperature remained stable.

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Additional Information

ACT Science Practice Questions - ACT Science Section (Enhanced ACT 2025) Exam

This practice set contains 100 questions from the matching question bank and focuses on experiment, shows, student, figure, and water. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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Frequently Asked Questions

This quiz contains a total of 100 practice questions carefully selected to test your knowledge on this subject.
Yes, you will have exactly 0 minutes to complete the exam. A countdown timer will be visible once you start.
Yes, you can retake this practice test as many times as you need. The questions and options may be randomized on subsequent attempts to ensure comprehensive learning.

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