Recitation Worksheet One - Key

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School

Georgia State University *

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Course

2222

Subject

Chemistry

Date

Dec 6, 2023

Type

pdf

Pages

Uploaded by CommodoreUniverse12942

Recitation Worksheet One Name: UGA ID: Instructions: § Please enter your first and last name as it appears on the eLC roster (do not use a nickname that is not reflected in eLC). § Your UGA myID is a combination of letters and numbers (example: mine is jmj81738). Do not enter your 81x number. § Download this worksheet and print it if you have a printer. Write the answers in the answer boxes and show your work when appropriate. Using the instructions in the Welcome module on eLC, convert your worksheet to a PDF and then upload it to Gradescope. If you have an iPhone or Android device, you can scan and upload directly through the Gradescope app. The pages must be in the correct order or Gradescope will not be able to read it. § If you do not have a printer, download the worksheet and type your answers in the answer boxes and upload it to Gradescope. Write your work on separate sheets of paper, convert these pages to a PDF using the instructions in the Welcome module on eLC, then upload them to the dropbox on eLC for this worksheet. § If you are using an app to annotate the worksheet, make sure the pages are in the correct order and have the same layout as the original or Gradescope will not be able to read it. § Answers must be written in the corresponding answer box or no credit will be awarded. § This worksheet is due no later than 11:59 PM on the Friday of the recitation week. § The instructions for uploading worksheets to Gradescope can be found in the Content area of eLC in the Welcome Module. § You must show your work to receive credit. § A periodic table and formula sheet are attached to the end of this worksheet. Please keep these attached to your worksheet in the correct order when submitting to Gradescope. 1. Label the following statements as either (A) qualitative or (B) quantitative. You only need to write the corresponding letter (“A” or “B”) in the boxes below. This recitation worksheet took a long time to complete. This recitation worksheet took 50 minutes to complete. The University of Georgia is a very large school. Hey A B A

2. A drug has a recommended dose of 4.00 mg/kg of body mass. If a person’s body mass is 215 pounds, what dose in milligrams will this individual need? (1 pound = 453.59 g) mg 3. An iodine atom has a diameter of 2.66 × 10 -10 m. If iodine atoms are lined up so that they are just touching, how many of them would it take to have a line 1.00 feet long? (1 m = 3.28 ft) atoms 4. The degree of agreement among several measurements of the same quantity is called ______ and it reflects the reproducibility of a given type of measurement. The agreement of a particular value with the true value is called _______. 5. A student goes to the lab and is tasked with measuring the mass of a block of nickel metal that has a known mass of 16.00 grams. The student takes three different measurements in which they collect the following masses: 15.99 grams, 14.78 grams, and 15.29 grams. What statement best describes their results? A. Precision, accuracy B. Accuracy, precision C. Exactness, precision D. Exactness, correctness E. Accuracy, correctness A. Their measurements are both precise and accurate B. Their measurements are precise, but not accurate C. Their measurements are accurate, but not precise D. Their measurements are neither precise or accurate 390 215Pand É 390 1 IS X 109 toffee tiffin A O O O

6. In Season 1, Episode 13 of Avatar: The Last Airbender , the Yu Yan Archers are introduced, a group of skilled individuals important to the episodes plot. Commander Zhao, one of the characters in the show, says “their precision is legendary”. An image from the episode below showcases their skills, in which one of the archers shoots three arrows separately wherein each subsequent arrow is shown piercing through the other, with all three ultimately going through the bullseye. (a) Based on the image above, what would be a better representation of Commander Zhao’s statement? (b) Near the end of the episode, Admiral Zhao (at this point he has received a promotion to Admiral) needs the Yu Yan Archers to shoot a single arrow at their opponent from a far distance using the element of surprise. It is assumed that they only have one attempt to make this work, in which the Admiral says “a situation like this requires... precision ” alluding to his statement made earlier in the episode. Was Admiral Zhao correct in saying precision (alone) was necessary? A. “their accuracy, but not precision, is legendary” B. “their precision, but not accuracy, is legendary” C. “their precision and accuracy is legendary” D. None of the above, the Commander’s original statement should be kept as is A. Yes, precision alone was needed B. No, only accuracy was needed C. No, both accuracy and precision was needed D. No, neither accuracy or precision was needed C O B O

7. Express 784,000,000 in proper, exponential (scientific) notation. 8. Perform the following conversions below and report your answers in scientific notation . Do not place units in the boxes. (a) 145.21 kg → mg (b) 0.490 nm → m (c) 42.1 cm 3 → L (d) 1.73 × 10 5 m 3 → cm 3 9. Record the number of significant figures for each of the following values below. In each box, you only need to record the integer (e.g. for one sig fig, record “1”). If there is an infinite number of significant figures, write “INF”. (a) 4700 (e) 0.4700 (b) 4700 pencils (f) 00.4700 (c) 4700.0 grams (g) 4700.0100 (d) 0.000470000 (h) 4.7000000 × 10 32 7 84 X 108 1 4521 108 145.21 x if 4 so x 10 0.490 x É um 4 21 10 42.1 on II ÉE 1 77 X 10 1.72 10 m3 III Z 4 INF 4 S 8 6 8

10. Complete the mathematical operations below and record your answers in the appropriate number of significant figures. (a) 0.05000 × 21.000000 = (b) 0.459 + 12.33 – 0.00100 = (c) 14.010 – 13.99 + 5 = (d) (433.621 – 333.9) × 11.900 = (e) 11. Assuming 100 is an exact number in this mathematical expression, what is the answer to the percent calculation expressed to the correct number of significant figures? 8.9250 – 8.905 8.9250 × 100 = ( 249.362 + 41 ) 63.498 = 4 SF X 8sf 1.050 Ust 12.79 two decimals p s no decimals 1190 I 3 Sf 99.121 X 11.900 JSF Sst 3 Sf 4 s 3 decimals y 2 sig Ffs gÉ x 100 0.22 0.22 Yo

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