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OFFICIAL ACT Form 59F · January 2003

Science

34 questions ~9 min recommended
⏱ 00:00
Score
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=== Passage I ===
Metamorphic rocks form when temperature and/or pressure cause changes in preexisting rock. Figure 1 shows Facies Metamorphic grade* the temperature and pressure conditions in which certain facies (categories of metamorphic rocks) are formed...

=== Passage II ===
In 1908, an object from outer space devastated 2,000 km2 of forest in Siberia. The object was between 10 m and 100 m in diameter and traveled at a maximum speed of 15 km/sec...

=== Passage III ===
The researchers planted 2,550 seeds from a third species, Species C. They also observed 2,550 Species C seeds that were planted by ants in similar environments...

=== Passage IV ===
Some students conducted experiments using different brands of adhesive tape, one kind each of paper and plastic, a board, and a spring scale...

=== Passage V ===
Researchers conducted an experiment to determine the factors affecting heat flow. In each trial, one or more blocks of a particular material were placed between two walls...

=== Passage VI ===
Flameless ration heaters (FRHs) are used by combat soldiers to heat their meals in the field. The heat is produced when magnesium reacts with water...

=== Chemical Reactions ===
This passage discusses the reaction of Mg and H2O in various experiments.

1. According to Figure 2, which of the following minerals would most typically be found only in rocks of a medium grade?

2. According to Figure 1, a Facies G rock will most likely form under which of the following pressure and temperature conditions?

3. Figure 1 indicates that as depth increases, pressure:

4. According to Figure 2, the presence of which of the following minerals in a metamorphic rock would be least helpful in determining that rock’s grade?

5. Which of the following phrases best describes the major point of difference between the 2 scientists’ hypotheses?

6. According to Scientist 2’s viewpoint, compared to the altitude at which a stony asteroid would have exploded in Earth’s atmosphere, a comet of similar size would most likely have exploded at:

7. Scientist 1’s viewpoint indicates that when the materials that compose most of a comet are sufficiently heated, they change to:

8. Which of the following statements best describes how Scientist 2 would explain why no large, identifiable fragments of the object have been recovered?

9. How would the behavior of the asteroid differ from that described in Scientist 2’s viewpoint if the asteroid had not been flattened by the air pressure difference?

10. Which of the following statements would both scientists most likely use to explain the damage to the forest caused by the object’s explosion? Energy from the explosion:

11. Based on the results of Study 3, one could generalize that compared to hand-planting of seeds, ant-planting of seeds results in:

12. Which of the following variables was controlled in the design of Study 2?

13. According to the results of the studies, Species A and Species B are most similar in that their:

14. In Study 2, Site 3 was used to study the:

15. Which of the following is a weakness of the design of Study 2?

16. The results of the 2 experiments support the conclusion that, for a given brand of tape, as the tape’s width increases, the force required to remove the tape from a given wrapping:

17. In Experiment 2, had Brand X tape in a 4.0 cm width been tested, the force required to remove the tape from the plastic wrapping would have been closest to:

18. Based on the average results of Experiments 1 and 2, which of the following brands of tape adhered better to the paper than to the plastic?

19. Which brand(s) of tape was/were used at only 2 different widths in both experiments?

20. For the students to determine the force required to remove tape from a wrapping, which of the following attractive forces had to exceed the adhesive force between the tape and the wrapping?

21. According to the information provided, heat flowed from the wall at temperature T1 to the wall at temperature T2 in which trial?

22. Insulators are materials that are poor heat conductors. According to Trials 7 through 10, a wall of a given thickness built of which of the following materials would provide the best insulation between a room and the outdoors?

23. The results of Trials 1 and 5 are consistent with the hypothesis that heat flow from a hotter wall to a cooler wall is dependent on the:

24. Materials differ in their thermal conductivities: the higher the thermal conductivity, the greater the heat flow through the material. According to Trials 6 through 11, which of the following statements about relative thermal conductivities is NOT true?

25. Which of the following is the most likely reason that amounts greater than 0.125 mol of NaCl were not tested in Experiment 3?

26. Based on the results of Experiment 3, one can reasonably conclude that as the amount of NaCl added increased from 0 mol to 0.100 mol, the maximum rise in temperature within 15 min of the start of the reaction:

27. If a trial had been done in Experiment 3 with 0.060 mol of NaCl added, the maximum temperature increase of the mixture that would have occurred within 15 min would have been closest to:

28. Which of the following factors affecting the reaction of Mg and H2O was studied in Experiment 1, but not in Experiments 2 or 3?

29. An engineer is designing an FRH, to be used with 100 mL of H2O, that will most rapidly generate the greatest amount of heat with the least amount of materials. Which of the following specifications should she choose?

30. It has been observed that as Mg and H2O react, the Mg(OH)2 (magnesium hydroxide) that is produced forms an unreactive coating on the Mg surface. Which of the following models for why NaCl speeds up the reaction is most consistent with this observation?

31. According to Figure 2, Enzyme A has the fastest rate of reaction at a pH closest to:

32. Based on the data in Figure 2, at which of the following pHs, if any, do Enzymes A and B have the same acceleration factor?

33. A scientist claims that the acceleration factor of Enzyme B is dependent on both enzyme and substrate concentration. Do the data in Figures 3 and 4 support her claim?

34. A scientist claims that for the conditions used to obtain the data for Figure 4, the acceleration factor of Enzyme B at a given concentration will always be greater than that of Enzyme A at the same concentration. Do the data support his conclusion?

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