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OFFICIAL ACT Form Z08 · April 2022

Science

19 questions ~9 min recommended
⏱ 00:00
Score
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=== Passage I ===
Table1 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 ===
A study performed at a site off the Mediterranean coast examined how an ocean storm during the winter affected wave height, current speed, and the rate of sedimentation.

=== Passage III ===
Scientists studied how perceived predation affects the production of offspring by female song sparrows (Melospiza melodia).

=== 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.

=== Passage V ===
Spheres W and X will reach the finish line in the same amount of time. The acceleration of a sphere due to gravity is independent of the sphere’s mass, so the 2 spheres will have the same acceleration and, therefore, the same average speed.

=== Passage VI ===
Microtubules (MTs), which are structural components of cells, continuously elongate and shorten. An MT in catastrophe stops elongating and starts to shorten. An MT in rescue stops shortening and starts to elongate.

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

2. Based on Table1, mixing the Br− solution with which of the test solutions listed below results in the formation of a precipitate having a yellow color?

3. When sodium iodide (NaI) is dissolved in water, Na+ and I− ions are produced. Based on Table1, 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 SolutionB 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. When each of the 4 halide solutions is mixed with the Ca2+ test solution, only 1 precipitate forms. This precipitate most likely has what chemical formula?

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

10. 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?

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

12. Consider the value of the average wave height on the day before the storm began. After the storm began, approximately how many days did it take for the average wave height to return to that value?

13. The average number of offspring (as eggs, as hatchlings, and as fledglings) per nest in each clutch is recorded. Suppose that 1yr 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?

14. A speaker that was set up near a nest in the PT group broadcast the calls and sounds of:

15. The statement 'On average, female M. melodia sparrows have fewer fledglings when exposed to the calls and sounds of predators than when exposed to the calls and sounds of nonpredators' is consistent with the results of the study for which of the clutches, if either?

16. The results of the study provide evidence of which of the following situations involving predators and prey?

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

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

19. According to the results of Experiments 1 and 2, on the day that an average peel color was assigned, did the bananas have a higher or lower amount of sugars present?

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