ACT Science Practice Test 66

I cannot render this content as requested. The passage you've provided consists of tables and data (circuit diagrams, resistance/current measurements, chemical concentration data) rather than a traditional prose passage with underlined text portions to mark. The questions reference relationships in data tables and ask about experimental results, but there are no underlined phrases in the original passage text that correspond to the question markers (1-11). Without clear underlined text segments in the passage that match the length and structure suggested by each question's answer options, I cannot accurately determine what portions should be wrapped in `` tags. To proceed, I would need: 1. The actual prose passage (if one exists separately from these tables) 2. Clear indication of which text spans are underlined in the original material 3. Confirmation that the questions refer to specific underlined passages rather than data interpretation Could you provide the passage in a format that shows which phrases are underlined?

Ohm’s law states that V = I × R and WRC/L where V = voltage, I = current, R = resistance, C = cross-sectional area of the wire, W = resistivity of the wire, and L = length of the wire. Using the circuit pictured in Figure 1, a student performed two experiments.

Figure 1

Experiment 1

A 5 V battery was used and the resistance was varied. Table 1 displays the results.

Table 1

Experiment 2

A battery of 1 volt was used and three different wires, each with the same resistivity and length, were used to complete the circuit. Table 2 shows the results and Figure 2 shows the relationship between the diameter of the wire and the measured resistance of each wire.

Table 2

Figure 2

Scientists tested a new method of titration, called atomic absorption inhibition titration (AAIT). They ran a series of experiments to determine if AAIT could be used successfully to determine the presence of phosphate, silicate, and sulfate in river and waste water. AAIT involves continually adding magnesium to a stirred sample solution while monitoring the solution for magnesium absorption.

Experiment 1

The scientists conducted an experiment to determine the effect of sulfate on titration of phosphate. Four trials were conducted, varying the concentration of both the sulfate and the magnesium used for the titration. Table 1 displays the results of the AAIT for solutions containing phosphate and sulfate and varying concentrations of magnesium.

Table 1

Experiment 2

Analysis of water from the Milwaukee River was performed. Solutions containing phosphate and sulfate were analyzed using AAIT. Titrations were performed on river water, river water plus the addition of phosphate, and standardized phosphate solution. The endpoint was noted for each trial when the titration reached the conditions under which only silicate would be detected. Table 2 shows the data collected, in ml.

Table 2

Experiment 3

Scientists created artificial waste water by adding phosphate, silicate, and sulfate to water and then conducting AAIT to simultaneously determine how much of each substance was in the water. Four titrations were conducted. Table 3 displays the results.

Table 3

Science practice 45