BIOLOGYTEST1 - Name Unit 1 Exam Status Completed Score 84 out of 100 points Time Elapsed 1 hours 55 minutes and 6 seconds out of 2 hours and 0

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Sheet1 Page 1 Name: Unit 1 Exam Status : Completed Score: 84 out of 100 points Time Elapsed: 1 hours, 55 minutes, and 6 seconds out of 2 hours and 0 minutes allowed. Instructions: Question 1 Multiple Choice0 of 2 points Equal volumes of vinegar from a freshly-opened bottle are added to each of the following solutions. After complete mixing, wh Selected Answer: 100 mL of tomato juice Correct Answer: 100 mL of household cleanser containing 0.5M ammonia Question 2 Multiple Choice0 of 2 points If the pH of a solution is decreased from 9 to 8, it means that the Selected Answer: concentration of OH- has decreased to one-tenth (1/10) what it was at pH 9. Correct Answer: concentration of H+ has increased 10-fold (10X) compared to what it was at pH 9 and concentration of OH- h a Question 3 Multiple Choice2 of 2 points What is the pH of a solution with a hydrogen ion [H+] concentration of 10-8M? Selected Answer: pH 8 Correct Answer: pH 8 Question 4 Multiple Choice2 of 2 points Water is able to form hydrogen bonds because Selected Answer: the bonds that hold together the atoms in a water molecule are polar covalent bonds. Correct Answer: the bonds that hold together the atoms in a water molecule are polar covalent bonds. Question 5 Multiple Choice0 of 2 points How many molecules of glycerol (C3H8O3) would be present in 1 L of a 1 M glycerol solution? Selected Answer: 14 Correct Answer: 6.02 x 1023 Question 6 Multiple Choice2 of 2 points A given solution contains 0.0001(10-4) moles of hydrogen ions [H+] per liter. Which of the following best describes this solutio n Selected Answer: acidic: H+ donor Correct Answer: acidic: H+ donor Question 7 Multiple Choice2 of 2 points One liter of a solution of pH 2 has how many more hydrogen ions (H+) than 1 L of a solution of pH 6? Selected Answer: 10,000 times more Correct Answer: 10,000 times more Question 8 Multiple Choice2 of 2 points If the pH of a solution is increased from pH 5 to pH 7, it means that the Selected Answer: concentration of OH- is 100 times greater than what it was at pH 5. Correct Answer: concentration of OH- is 100 times greater than what it was at pH 5. Question 9 Multiple Choice2 of 2 points The molecular mass of glucose is 180 g. Which of the following procedures should you carry out to make a 1 M solution of gl u Selected Answer: Dissolve 180 g of glucose in water, and then add more water until the total volume of the solution is 1 L. Correct Answer: Dissolve 180 g of glucose in water, and then add more water until the total volume of the solution is 1 L. Question 10 Multiple Choice2 of 2 points Buffers are substances that help resist shifts in pH by
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Sheet1 Page 2 Selected Answer: donating H+ to a solution when they have been depleted and accepting H+ when the are in excess. Correct Answer: donating H+ to a solution when they have been depleted and accepting H+ when the are in excess.
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This note was uploaded on 02/27/2010 for the course BSC 28348 taught by Professor Kidns during the Spring '10 term at Fayetteville State University.

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BIOLOGYTEST1 - Name Unit 1 Exam Status Completed Score 84 out of 100 points Time Elapsed 1 hours 55 minutes and 6 seconds out of 2 hours and 0

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