Exam 1 (Answer Key)

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Utah State University *

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1210

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Chemistry

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Jun 21, 2024

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Name: CHEM 1210 1 CHEM 1210 – Exam 1 (Chapters 1-3) Instructions: Please ask your testing center facilitator to give you a copy of our Exam 1 Cover Sheet.pdf (which includes a detailed periodic table) and as much scratch paper as you need. You are welcome to use as much as you want. When you are done, please turn your scratch paper into the testing center facilitator, who will scan and send it to me (your instructor). I will look it over and award you partial credit, where applicable, for calculation problems. You will also need to bring and use a calculator, or you can check one out from your testing center. You cannot use a smartphone while taking your exam. Please carefully read each problem below and then select the most correct answer from each of the multiple-choice options provided. There will be 25 total questions graded, worth 4 points each, for a total of 100 points. You will have 140 minutes (2 hours, 20 minutes) to finish the exam. Good luck! Useful Information 1 inch = 2.54 cm 1 cup = 236.59 mL 1 m = 3.28 ft 1 mile = 1.61 km 1 pound = 454 g 1 m 3 = 1000 L 1 hour = 3600 seconds 1 day = 24 hours 1 m = 100 cm Avogadro’s number = 6.022 × 10 23 molecules/mole K = °C + 273.15 °C = (5/9) x (°F – 32) °F = (9/5) x (°C) + 32 % yield = (actual / theoretical) × 100
Name: CHEM 1210 2 CHEM 1210 – Exam 1 (Chapters 1-3) Disclaimer (PLEASE READ THIS): The Exam 1 you took on Canvas pulled each question from a databank of 2 to 8 questions per concept. For example, Chapter 1, Question #1 asked you to do a temperature conversion, for which Canvas randomly chose one of four different “ temperature conversion ” problems, all of equal difficulty. Canvas also randomly shuffled the order of the multiple- choice options for each question. Thus, every student took a slightly different Exam 1, with each version presenting questions from the same concepts and difficulty levels, with their multiple-choice orders randomized. The questions and answers presented here are accordingly representative of each problem you were asked, but they might (or might not) differ slightly, including their multiple-choice orders. Questions from Chapter 1 (32 points – 8 questions) Temperature Conversions 1. Which answer below (A – D) represents the correct answers to questions a , b , and c ? A. How many degrees Fahrenheit is 37 degrees Celsius? B. How many kelvins is 25 degrees Fahrenheit? C. How many degrees Celsius is 98.6 degrees Fahrenheit? A. Answer to a = 53 °F; Answer to b = 2.7 × 10 2 kelvins; Answer to c = 37 °C B. Answer to a = 99 °F; Answer to b = 261 kelvins; Answer to c = 37 °C C. Answer to a = 99 °F; Answer to b = 270 kelvins; Answer to c = 37 °C D. Answer to a = 99 °F; Answer to b = 2.7 × 10 2 kelvins; Answer to c = 120 °C Answer: C See https://www.youtube.com/watch?v=q5vyfQTpXXU Density/Mass 2. The density of toluene at 25 °C is 866.90 kg/m³. Please calculate the mass (in grams) of 1.2500 L of toluene at this temperature. Then select the answer below (A – D) that best represents the correct answer. A. 1083.6 grams B. 1.0836 × 10 6 grams C. 1.0836 grams D. 1.4419 × 10 – 3 grams Answer: A See https://www.youtube.com/watch?v=FMOhjQ29zCE
Name: CHEM 1210 3 Significant Figure Identifications 3. Which of the following (A – E) has the same number of significant figures as the number 0.003104? A. 1 × 10 6 B. 199.791 C. 8.66 D. 5.119 E. 100 Answer: D See https://www.youtube.com/watch?v=8CEBXQFJ6As Significant Figure Calculations 4. Which answer below (A – D) represents the correct answer to the mathematical problem shown below, rounded to the correct number of significant figures? [(357.2 × 10 4 ) – (7.600 × 10 3 )] × 4.5817 A. 1.63 × 10 7 B. 1.6 × 10 7 C. 1.633 × 10 7 D. 2.0 × 10 7 Answer: B See https://www.youtube.com/watch?v=8CEBXQFJ6As Dimensional Analysis/Unit Conversion 5. The average human bladder can comfortably hold 2.0 cups of urine. Please convert this to L. Then select the option below (A – D) that best represents the correct answer. A. 8.5 × 10 – 3 L B. 2.0 × 10 – 3 L C. 0.47 L D. 2.4 × 10 – 1 L Answer: C See https://www.youtube.com/watch?v=8CEBXQFJ6As , https://www.youtube.com/watch?v=HqgBma7QnuU , https://www.youtube.com/watch?v=geskIln_11o
Name: CHEM 1210 4 6. The Eiffel Tower is 986 feet tall. Please convert this to nanometers. Then select the option below (A – D) that best represents the correct answer. A. 301 nm B. 9.86 × 10 11 nm C. 3.05 × 10 8 nm D. 3.01 × 10 11 nm Answer: D See https://www.youtube.com/watch?v=8CEBXQFJ6As , https://www.youtube.com/watch?v=HqgBma7QnuU , https://www.youtube.com/watch?v=geskIln_11o 7. Bamboo can grow up to 60.0 cm/day. Please convert this growth rate into feet per second. Then select the option below (A – D) that best represents the correct answer. A. 3.28 × 10 – 3 feet/second B. 5.47 × 10 – 4 feet/second C. 8.20 × 10 – 2 feet/second D. 2.28 × 10 – 5 feet/second Answer: D See https://www.youtube.com/watch?v=8CEBXQFJ6As Dimensional Analysis/Unit Conversion Application 8. If an electric car were capable of going 125 miles on a single charge, and you were driving from Vernal to Logan (a distance of 407 kilometers), then how many times would you have to stop to charge your battery along the way, assuming you started traveling with a full charge? For full credit, you must show your work. (Note: I want a whole number, not a decimal. You can’t, for example, stop your car three-and-a- half times. That’s just ridiculous.) A. Once B. Twice C. Thrice D. Four times (or “frice”) Answer: B See https://www.youtube.com/watch?v=FMOhjQ29zCE , https://www.youtube.com/watch?v=8CEBXQFJ6As , https://www.youtube.com/watch?v=HqgBma7QnuU , https://www.youtube.com/watch?v=geskIln_11o
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