Chemistry > EXAM > CHEM 120 Week 1: Quiz (All)

CHEM 120 Week 1: Quiz

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Here is some information about the quiz. This quiz covers COs 1 and 2 and Chapters 1, 2, and 3. This quiz is worth 30 total points, which include the following questions: 10 multiple choice questions (2 points each); 2 short-answer questions (3 points each); one essay question 4 points. You have 40 minutes to finish the quiz. When the time limit is reached, you will automatically be exited from the exam. By submitting this work, I am attesting that it abides by the Student Honor Code. Good luck! Attempt History Attempt Time Score LATEST Attempt 1 39 minutes 20 out of 30 * * Some questions not yet graded Score for this quiz: 20 out of 30 * Submitted May 6 at 1:33pm This attempt took 39 minutes. Question 1 Not yet graded / 4 pts (TCO 1) You have been growing the same variety of corn for over 5 years. In the past two years, you have noticed that the yield has decreased by 10% each year. You grow corn on 10 acres of land and your yield should be 1,000 bushels per acre. Growing conditions have been consistent for the past 5 years. You want to identify another variety of corn that will produce 1,000 bushels per acre. You currently grow Variety ZQB. You want to test two new varieties, CAQ and TWX. You hypothesize that CAQ will produce 1,000 bushels per acre. Design an experiment to test this hypothesis. Include your control(s) (1 pts) and your experimental design (3 pts). Describe the experimental results that would support your hypothesis. (1 pts) Be specific. Your Answer: Observation: Variety currently does not produce at least 1000 bushels per acre each year. My hypothesis is that CAQ will produce 1000 bushels per acre. Experiment: Use 3 acres for CAQ and 3 acres for TWX, water all variety at the same time and day. Continued experiment each year for 4 years. Controls: Using ZQB corn for the remainder 4 acres and watering all 10 acres at the same time. Results: ZQB continued to decrease by 10% each year on average. CAQ produced 1000 bushels per year on average. and TWX only produced 600 bushels per year on average. As a result my hypothesis was correct. Answers will vary. Chapter 1 and lecture. Question 2 Not yet graded / 3 pts (TCO 1) How many pounds are in 5 kg? Show your work. Your Answer: 2.2 pounds = 1kg 5kg x 2.2 pounds/1kg= 11 lbs x pounds = 5 kg x (1 lb/0.454 kg) = 11 lb (Chapter 1; 1 pt for units, 1 point for conversion factor; 1 point for answer) Question 3 Not yet graded / 3 pts (TCO 1) What is the mass of 50.0 mL of an intravenous glucose solution with a density of 1.15 g/mL? Show your work. Your Answer: mass= dxv 1.15g/mL x 50 mL = 56g Density = mass in g/volume in mL; m = d * v; x g = (50.0 mL) x (1.15 g/mL) = 57.5 g (Chapter 1; 1 pt for units, 1 point for showing work; 1 point for answer)

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