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Tip #37 to Get a Top ACT English Reading Science Score (page 2)

By McGraw-Hill Professional
Updated on Sep 10, 2011

Example Problems

Experiment 1

A mercury thermometer, at an initial temperature of 15°C, was placed in a 25°C solution, and the temperature shown on the thermometer was recorded over time. This procedure was repeated using solutions at 30°C and 35°C. Table 1 shows the recorded temperatures in °C over time for the thermometer placed in each solution.

Experiment 2

Next, the same thermometer, at an initial temperature of 45°C, was placed into a beaker of helium at 15°C, and the temperature was recorded over time. This was repeated for 30°C and 45°C beakers of helium (see Figure 1).

Choose the best answer for each question. Watch for the six types of ACT Science questions.

1. Based on Figure 1, at 25 s, the thermometer reading in the 30°C helium most likely was closest to which of the following?
1. 38.0°C
2. 40.5°C
3. 45.0°C
4. 50.5°C
2. When the thermometer was in the 25°C solution, in the time interval between 3 s and 4 s, approximately how rapidly, in °C/s, was the temperature registered by the thermometer changing?
1. 1°C/s
2. 3°C/s
3. 4°C/s
1. 25°C/s
3. According to Table 1, for a solution temperature of 35°C, over which of the following time intervals was the thermometer reading changing most rapidly?
1. 0 to 1 s
2. 1 to 2 s
3. 2 to 3 s
4. 3 to 4 s
4. Based on Figure 1, for the thermometer placed in 30°C helium, the mercury atoms in the thermometer were moving most slowly at which of the following times?
1. 0 s
2. 20 s
3. 30 s
1. 40 s
5. Based on Figure 1, if the thermometer, at an initial temperature of 45°C, had been placed in a helium sample at 5°C, how long would it most likely have taken the thermometer reading to reach 40°C?
1. Less than 20 s
2. Between 20 s and 25 s
3. Between 25 s and 30 s
4. Greater than 30 s
6. In Experiment 2, placing the thermometer into which of the following beakers of helium was used to test if the helium temperature was held constant?
1. The 15°C beaker of helium
2. The 30°C beaker of helium
3. The 45°C beaker of helium
1. The 25°C solution
7. The kinetic energy of mercury decreases as temperature decreases. Based on this information, over all samples in Table 1, as time passes, the kinetic energy of the mercury
1. increases only
2. decreases only
3. increases, then decreases
4. decreases, then increases