Question 16 Answer and Explanation _ACT June 2019 Form B02 Science Section

Passage III

Students performed 3 experiments to investigate the absorption of H₂O by dried chickpeas (a type of bean).

Experiment 1

A sample of 50 dried chickpeas with similar sizes and masse was selected. The total mass of the sample was measured, and the average initial mass per chickpea (CM_i) was calculated. The sample was immersed in 200 mL of distilled H₂O at 20°C. After 20 min, 5 chickpeas were removed from the distilled H₂O and gently patted dry with a paper towel, and their total mass was then measured. The average final mass per chickpea (CM_f) was calculated. At each of 6 different time thereafter, another 5 chickpeas were removed from the distilled H₂O and gently patted dry with a paper towel, and their CM_f was determined. The average moisture uptake per chickpea (CMU) was then calculated for each group of 5 chickpeas using the following equation:

The results are shown in Table 1.

Experiment 2

The students repeated the procedure from Experiment 1 at 4 other temperatures (see Table 2).

Experiment 3

The students repeated the procedure from Experiment 1, except that they replaced the distilled H₂O with aqueous solutions of NaCl at 3 different concentrations (see Table 3).

16. Consider the group of chickpeas in Experiment 1 that were soaked in the distilled H₂O for 60 min. If these chickpeas had not been patted dry after being removed from the H₂O, would their CMU more likely have been greater than or less than the value shown in Table 1 for a soaking time of 60 min ?

F. Greater, because their CM_f would have been greater.

G. Greater, because their CM_fwould have been less.

H. Less, because their CM_fwould have been greater.

J. Less, because their CM_fwould have been less.

Answer and Explanation

Your Answer is

Correct Answer is F

Explanation

General knowledge questions.

If the moisture on the surface of chickpea is not dried, the measured CMf will be too large