ACT Science Mastery Lesson 13
Presentation
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Science
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9th - 12th Grade
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Practice Problem
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Medium
Standards-aligned
Alexus Jacobs
Used 63+ times
FREE Resource
11 Slides • 5 Questions
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ACT Science Mastery Lesson 13
Drawing Conclusions
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Passage
Several recent health studies point to excessive sodium intake as a contributing factor to Various health problems. Sodium is typically added to food in the form of table salt (NaCl). Students performed two experiments to measure the sodium levels of various canned goods.
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Multiple Choice
Based on the results of Experiment 1, if the concentration of Na in the solution is doubled, then the corrected absorbance of the solution will approximately...
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The correct answer is B.
In Table 1, each time the concentration of Na doubles (for example, from 1.0 to 2.0) then the corrected absorbance also doubles (for example, from 0.1 to 0.2).
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Multiple Choice
Based on the results of Experiment 1, if the concentration of Na in the solution is halved, then the corrected absorbance of the solution will approximately...
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The correct answer is C.
When the concentration of Na is halved in Table 1 (for example, from 4.0 to 2.0) then the corrected absorbance also decreases by half (in this example, from 0.4 to 0.2).
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Multiple Choice
If a sample of peas were also included in Experiment 2, and the students measured its corrected absorbance at .321, then which of the following correctly lists corn, carrots and peas in increasing order of Na concentration?
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The correct answer is C.
To answer this, first we have to spot the pattern that the concentration of Na for each vegetable is 10 times the corrected absorbance. Therefore we can predict that the Na concentration of peas is .321 x 10 = 3.21 ppm. Now we order the three vegetables in terms of increasing concentration. Carrots = 0.024, Peas = 3.21, and Corn = 4.39.
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Multiple Choice
If a sample of peas were also included in Experiment 2, and the students measured its corrected absorbance at .321, then which of the following correctly lists mixed vegetables, green beans, and peas decreasing order of Na concentration?
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The correct answer is B.
To answer this, first we have to spot the pattern that the concentration of Na for each vegetable is 10 times the corrected absorbance. Therefore we can predict that the Na concentration of peas is .321 x 10 = 3.21 ppm. Now we order the three vegetables in terms of decreasing concentration. Green beans = 5.52, Peas 3.21, and Mixed Vegetables = 1.23.
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Multiple Choice
Using Table 1, what is the best prediction of the corrected absorbance of an Na solution with a concentration of 16 ppm?
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The correct answer is D.
The pattern in Table 1 is that the corrected absorbance is the concentration divided by 10. 16/10 = 1.6.
ACT Science Mastery Lesson 13
Drawing Conclusions
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