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OFFICIAL ACT Form Z08 · 2020

Science

14 questions ~9 min recommended
⏱ 00:00
Score
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=== Passage I ===
Table 1 shows the results of mixing each of 4 colorless aqueous halide solutions with a colorless aqueous test solution containing calcium (Ca2+), silver (Ag+), thallium (Tl+), or lead (Pb2+). A halide in solution can be identified by mixing the solution with various test solutions and observing the precipitates (solids), if any, that form. Table 2 shows the results of mixing each of 2 colorless aqueous solutions (A and B) with each test solution.

=== Passage II ===
From November 4 to November 24, the average wave height, in meters (m), and the average current speed, in centimeters per second (cm/sec), were determined daily. The mass of sediment, deposited per square meter (m2) of ocean floor per day (the sedimentation rate) was also determined daily over those 21 days.

=== Passage III ===
Scientists studied how perceived predation affects the production of offspring by female song sparrows (Melospiza melodia). At the beginning of a breeding season, nests without eggs were located in low-growing shrubs.

=== Passage IV ===
As a banana ripens, the external peel changes color and the chemical composition of the internal pulp changes. Three experiments were performed to study the ripening of bananas.

=== ... ===
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1. Table 1 shows the results of how many total tests?

2. Based on Table 1, mixing the Br− solution with which of the test solutions results in the formation of a yellow precipitate?

3. When sodium iodide (NaI) is dissolved in water, Na+ and I− ions are produced. Based on Table 1, mixing a colorless aqueous solution of NaI with the Ag+ test solution would most likely result in the formation of:

4. Suppose that Solution A and Solution B are combined to produce colorless Solution C. Based on Table 2, if Solution C is mixed with the Tl test solution, what will the result be?

5. Based on Tables 1 and 2, which 2 halide ions are NOT present in Solution B?

6. Based on Figure 4, the sedimentation rate, averaged over the period from November 4 to November 11, was closest to which of the following?

7. Based on Figure 2, were ocean waves absent on any of the days from November 4 to November 24?

8. The sediment traps were positioned how far above the ocean floor?

9. Each of the values of current speed plotted in Figure 3 is an average value. Based on the description of the study, is it more likely that each of these values was obtained by averaging measurements of current speed taken at different times of the day or by averaging measurements of current speed taken at different locations in the ocean?

10. Suppose that the storm had lasted for 48 hours. Based on Figure 3, the average current speed on November 14 would most likely have been:

11. Suppose that 1 yr after the sparrows fledged, the scientists wanted to determine how many fledglings from the PT group and how many fledglings from the NPT group had survived. Which of the following procedures, if it had been part of this study, would have enabled the scientists to monitor the fledglings’ survival 1 yr later?

12. To eliminate direct predation on M.melodia offspring, the scientists engaged in which 2 of the actions listed below?

13. According to the results of Experiment 3, from sample to sample over the 35 days of testing, which sugars always increased in mass?

14. Do the results of Experiment 2 indicate that each sample of pulp mixture contained only starch and sugars?

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