ACT - Science Reasoning

单选题

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

A. 34°C.
B. 42°C.
C. 50°C.
D. 62°C.

单选题

Suppose the experiment involving O2 and the 6 L vessel had been repeated, except at a room

A. less, because pressure is directly proportional to temperature.
B. less, because pressure is inversely proportional to temperature.
C. greater, because pressure is directly proportional to temperature.
D. greater, because pressure is inversely proportional to temperature.

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单选题

Suppose there had been no precipitation during 1 entire month of the 12-month period. Based on the information provided, during that month there would have been:

A. significant wet deposition of all 4 substances.
B. significant wet deposition of Cu2+ and Zn2+, but no wet deposition of Cl- and SO4 2-.
C. no wet deposition of any of the 4 substances.
D. no wet deposition of Cu2+ and Zn2+, but significant wet deposition of Cl- and SO4 2-.

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单选题

Suppose a scientist isolates a bacterial species that is 1 of the 4 species used in Experiment 1. She adds the species to sucrose broth and observes that neither acid nor CO2 is produced. She then adds the species to lactose broth and observes that both acid and CO2 are produced.Based on the results of Experiment 1, the species is most likely:

A. Species A.
B. Species B.
C. Species C.
D. Species D.

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单选题

Insulatorsare materials that are poor heat conductors. According to Trials 7 through 10, a

A. Wood
Brick
Concrete
D. Steel

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单选题

Based on the information provided, the “time earthquake starts at the focus” in Figure 2 corresponds to which of the following points on Figure 3 ？

A. 0 km, 0 min
B. 2,000 km, 5 min
C. 5,000 km, 12 min
D. 10,000 km, 20 min

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单选题

According to Figure 2, the presence of which of thefollowing minerals in a metamorphic rock would beleasthelpful in determining that rock’s grade？

A. Chlorite
B. Muscovite
C. Staurolite
D. Plagioclase

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单选题

Scientist 1<br>The object was a comet, a body made of ices (such asfrozen water or methane) and dust. Most of this cometarymaterial is volatile(easily vaporized) and low in density.Friction in Earth’s atmosphere heated the comet to a tem-perature at which it exploded, high above the ground. Themajority of the ices and dust were vaporized in the explo-sion, which explains why no crater was formed at the siteand why no large, identifiable fragments of the object werefound. An asteroid would not have been completelydestroyed. Intact asteroid fragments that reached theground would have created one or more craters uponimpact and left behind recoverable pieces. Evidence showsthat the object decelerated rapidly before it exploded.Because of their low density, comets are capable of suchrapid deceleration, whereas high-density objects, such asasteroids, are not.<br>Scientist 2<br>The object was a stony asteroid. As it entered Earth’satmosphere, its high speed created a large air pressure dif-ference between the area just in front of the asteroid andthe area just behind the asteroid. The large pressure differ-ence eventually exceeded the structural strength of theasteroid. The asteroid flattened, decelerated rapidly due tothe dramatic increase in its surface area, and fragmentedbefore reaching the ground. This fragmentation would haveappeared like an explosion. Calculations show that a cometbetween 10m and 100m in diameter would explode at analtitude much higher than 8km, but a stony asteroid of thatsize would fragment at or near an altitude of 8km.Recovery of large asteroid fragments is difficult due to thearea’s boggy soil; however, small, glassy fragments wererecovered and are believed to be melted and resolidifiedpieces of the asteroid.<br>Which of the following phrases best describes the majorpoint of difference between the 2 scientists’ hypotheses？

A. The location of the event
B. The speed the object was traveling
C. The density of Earth’s atmosphere
D. The type of object that entered Earth’s atmosphere

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单选题

An engineer is designing an FRH, to be used with 100mL of H2O, that will most rapidly generate thegreatest amount of heat with the leastamount of mate-rials. Based on the results of Experiments1, 2, and3,which of the following specifications should shechoose？

A. 0.50 mol Fe powder, 0.125 mol NaCl, and 0.10mol of Mg powder
B. 0.50 mol Fe powder, 0.125 mol NaCl, and 0.10mol of Mg ribbon
C. 0.70 mol Fe powder, 0.125 mol NaCl, and 0.10mol of Mg powder
D. 0.70 mol Fe powder, 0.125 mol NaCl, and 0.10mol of Mg ribbon

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单选题

Large plumes ;Small plumes

A. 0.2;0.5
B. 0.5;0.2
C. 0.5;0.9
D. 0.9;0.5

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