Workspace▸ Science▸ Test 49
← Back to Science
Science · Drill 49

Science practice 49

11 questions ~9 min recommended
⏱ 00:00
Score
—

T = 50°C Pressure Sol (atm) 51.2 107.2 3.18 4.51 156.6 3.45 T= 70°C Pressure (atm) 55.3 104.0 158.1 Sol 261 4.97 5.33 T= 90°C Pressure (atm) Sol 53.1 2.38 106.5 5.14 144.4 6.52

T = 50°C | Pressure Sol (atm) 22.1 12.8 31.1 18.9 39.9 23.1 T= 70°C Pressure (atm) 20.3 264 375 Sol 11.8 14.3 18.7 T = 90°C Pressure (atm) 20 30.4 42.4 Sol 6.93 12.0 14.0

how children learn1

Zone 3 Soil Composition Meters Zone 4 Soil Composition Legend Sandy Clay Clay Nodular Clay Gravel Bedrock

Plant Name Aster Big Blue Stem Compass Plant Goldenrod Indian Grass Kentucky Blue Grass Lead Plant Purple Coneflower Root Depth (m) 24 3.0 5.0 22 28 0.1 4.5 1.8 Plant Height (m) 0.5 2.1 2.4 1.0 2.3 0.1 0.8 1.5

•Zone 4 oZone 3 Hundreds ON A 00 Aster Compass Plant Goldenrod Lead Plant Coneflower Prevalence of Plants per Zone

Solubility refers to the ability of one substance, the solute, to dissolve in another (the solvent). The balance of molecules between the solvent and the solute determines the solubility of one substance in another. Factors such as temperature and pressure will alter this balance, thus changing the solubility.

Experiments to determine the solubility of methane and carbon dioxide in polyamide (PA-11) were performed in the temperature range 50–90°C, and the pressure range 50–150 atm for methane and 20–40 atm for carbon dioxide. Table 1 displays the solubility (sol) of methane in PA-11. Table 2 shows the solubility (sol) of carbon dioxide in PA-11.

Solubility = (g gas/g PA-11) × 103

Table 1—Methane

image

Table 2—Carbon Dioxide

image

Figure 1 shows the pressurization cycle for methane at 100 atm and 50°C. The mass gain divided by the net polyamide mass determines the solubility of the gas.
 

image

Figure 1

1. Which of the following substances did NOT become more soluble as pressure increased?

2. According to Table 2, at which temperature was carbon dioxide the most soluble under pressure of 31.1 atm?

3. Figure 1 supports which of the following claims about polyamide mass gain over time?

4. If the experiment was repeated at a temperature of 90°C and a pressure of 80 atm, the solubility of methane would be closest to:

5. Based on the results shown in Table 2, which of the following conclusions can be drawn regarding the relationship between pressure and solubility?

6. In this experiment, which substance functioned as the solvent?

As shown in Figures 1 and 2, the composition of soil varies by zone. Scientists wanted to determine which types of prairie plants grew best in which zones. To accomplish this, they visited prairies in Zone 3 and in Zone 4 and determined average plant height and root depth (see Table 1). They also looked at several 1-acre plots in both Zone 3 and Zone 4, and recorded the average number of each type of plant found (see Figure 3).

image

Figure 1

image

Figure 2

image

Table 1

image

image

Figure 3

7. In which zone is clay found at a depth of –3.5m?

8. Of the prairie plants studied, which had the tallest average plant height?

9. Based on the data in Figure 3, which of the following can be concluded about the prevalence of plants per zone?

10. A plant growing in which zone would have roots that reach clay first?

11. The average Lead Plant growing in Zone 3 would have roots that, at their deepest point, reach down to which of the following soil layers?

← Prev test Next test →
Jump to