ACT science practice test 47

Directions: Each passage is followed by several questions. After reading a passage, choose the best answer to each question and fill in the corresponding oval on your answer document. You may refer to the passages as often as necessary.

You are NOT permitted to use a calculator on this test.


A study was conducted to identify the factors that affect the evaporation rates of various liquids in air. Throughout the experiment, the amount of liquid was varied, and the surface area exposed to the air was also manipulated. Table 8.3 displays the results.

TABLE 8.3

1The liquid bleach was approximately 5% sodium hypochlorite and 95% water

The experiment was continued over a period of seven weeks for water and alcohol. Figure 8.5 shows the results graphically.

Figure 8.5

1. Based on the data for water in Table 8.3, which of the following statements do the data NOT support?

A. The trials with larger surface areas of exposed water had greater evaporation rates.
B. The evaporation rate for water is less than that for rubbing alcohol.
C. Water had approximately the same evaporation rate as orange juice.
D. Larger amounts of water correlate to higher evaporation rates.

2. In the experiment, 80 mL of orange juice with 4 cm2 exposed was left in the open for one week. Using the data in Table 8.3, how much of the original liquid was left at the end of the week?

A. 3.0 mL
B. 77.0 mL
C. 80.0 mL
D. 83.0 mL

3. Before the experiment, students made the following hypotheses:

Student 1: "Since I can smell rubbing alcohol as soon as I open the bottle, I expect it to have a greater rate of evaporation in air."

Student 2: "Since orange juice and liquid bleach are composed primarily of water, their evaporation rates will be close to that of water."

Student 3: "Surface area should not affect the rate of evaporation of a liquid because only the total amount of liquid affects evaporation rates."

Which of the hypotheses are supported by the data collected?

A. Student 1 only
B. Students 1 and 2
C. Students 1, 2, and 3
D. None of the students' hypotheses are supported by the data.

4. If 80.0 mL of rubbing alcohol are placed in a container with 20 cm2 exposed, what would be the approximate amount of liquid left in the container after one week?

A. 9 mL
B. 15 mL
C. 35 mL
D. 45 mL

5. Using Figure 8.5, what is the approximate number of weeks required for 80 mL of rubbing alcohol to evaporate completely from a container with a 4 cm2 exposure?

A. 9 weeks
B. 12 weeks
C. 28 weeks
D. The data does not provide enough evidence to make a reasonable prediction.

6. According to Figure 8.5, what is the rate of evaporation of water with a 4 cm2 exposed surface area?

A. 3 mL of water each week
B. 10 mL of water each week
C. 20 mL of water each week
D. 80 mL of water each week

7. Which of the following conclusions may be supported by Figure 8.5?

A. The rate of evaporation for alcohol increases with time.
B. The rate of evaporation for alcohol decreases with time.
C. The rate of evaporation for alcohol is fairly steady with time.
D. The rate of evaporation for water is greater than that for alcohol.

8. If data for vegetable oil were added to Figure 8.5, one would most likely see:

A. data with a steeper negative slope than that of rubbing alcohol.
B. data very similar to the line for water.
C. data with a flat line.
D. data very similar to the line for rubbing alcohol.

9. Which of the following statements about rubbing alcohol is supported by the data?

A. The variability between the trials increases with the surface area exposed.
B. A decrease in surface area of exposure increases the evaporation rate.
C. An increased amount of liquid in the container increases the evaporation rate.
D. The rate of evaporation for rubbing alcohol is greater than that for ethyl alcohol.

10. Although the graph for rubbing alcohol displays a general downward trend, the variations in the data could possibly be attributed to all of the following EXCEPT:

A. fluctuations in temperature in the room in which the containers were located.
B. variations in the air flow in the room in which the containers were located.
C. inaccuracies in the measurement of liquid volume.
D. varying amounts of initial liquid in the containers.