17NEW June 20 2019. Analysis of several plant food preparations for the content of organics yielded the following data: 16.40, 16.36, 16.26 and 16.34%. The true value is 18.50%. The results of this analysis are, Select one: a. Inaccurate but Precise b. Accurate and precise C. Accurate and imprecise d. Inaccurate and imprecise

17NEW June 20 2019. Analysis of several plant food preparations for the content of organics yielded the following data: 16.40, 16.36, 16.26 and 16.34%. The true value is 18.50%. The results of this analysis are, Select one: a. Inaccurate but Precise b. Accurate and precise C. Accurate and imprecise d. Inaccurate and imprecise

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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text fs % Questions: S T Calibri 1 f6 - Key Words: global warming 1. Why is oxygen NOT a greenhouse gas? ☐ 18 12 6 Y G + & BIUA 7 Lesson 2: Greenhouse Gases SYMPIREH 2. Why is the effect of greenhouse gases in the atmosphere similar to the effect of glass surrounding greenhouse? 3. The atmosphere on the planet Venus is almost 96 % carbon dioxide. What effect might its concentration of carbon dioxide have on the average surface temperature on Venus? fB 3 Page 3: The Structure of Greenhouse Gases Questions 4. What effect does an increase in the atmospheric carbon dioxide levels (and therefore rising temperatures) have on the amount of water vapor in the atmosphere? Why? U 漫 5. Both coal and natural gas can be burned to generate electricity. However, burning natural gas produces about half the carbon dioxide emissions as burning coal to provide the same amount of energy. Why is it better for the environment to phase out coal-burning power plants in favor of natural gas-burning power…
Interpretation of Data: Complete the table and interpret the observed data given in the worksheet. Test observation or Visual evidence Analysis and Interpretation 1. Test for C 2. Test for H 3. Test for N 4. Test for Cl in Belstein test 5. test for Cl in AGNO; 6. Test for Sulfur B. Write the chemical reactions of the following: a. test for Carbon and Hydrogen b. AGNO3 test
27 A chemist prepares a solution of sodium chloride (NaCl) by measuring out 0.50 g of NaCl into a 250. mL volumetric flask and filling to the mark with distilled water. Calculate the molarity of Cl anions in the chemist's solution. do Be sure your answer is rounded to 2 significant digits. 18 Ar mol x10 L Submit Assignment Continue 2022 McGraw Hill LLC. AIl Rights Reserved. Terms of Use Privacy Center Accessibility Show All IMG-6095.jpg IMG-6096.jpg IMG-6097.jpg IMG-6098.jpg IMG-6099.jpg MacBook Air DD DII F12 F11 F10 F9 80 F7 F8 F6 F5 F4 esc F2 F3 F1 & % @ # 7 8 3 4 5 6 1 2 { P E R Y Q W %24
62. Antacid Fizz When an antacid tablet dissolves in water, the fizz is due to a reaction between sodium hydrogen carbonate (NaHCO3), also called sodium bicarbonate, and citric acid (H₂CH₂O₂). 3NaHCO3(aq) + H₂CH₂O,(aq) → 3CO₂(g) + 3H₂O(l) + Na, C₂H₂O₂(aq) How many moles of Na₂C,H,O, can be produced if one tablet containing 0.0119 mol of NaHCO is dissolved?
Commercial concentrated hydrochloric acid has the following specification: Density = 1.2 g/mL; Weight percentage is 37% w/w: Molecular weight of HCl is 36.46 g/mol. If 12.0 mL of conc HC) is added to the reaction, how many moles of HCI have been added? Report your answer to the correct number of significant figures: do not report the units in your answer.OGMU 2020 QUESTION 3 If 5.0 mL of t-pentyl alcohol are involved in the reaction, how many moles of t-pentyl alcohol are present? Round your answer to the correct number of significant figures. Do not include the units in your answer. IUPAC name of t-pentyl alcohol is 2-methyl-2-butanol.OGMU 2020 (Hint: use the CRC Handbook Of Chemistry and Physics from our online library to get the correct numerical constants.) QUESTION 4 Given that the nucleophilic substitution reaction used 5.0 mL of t-pentyl alcohol and 12.0 mL of conc. hydrochloric acid to produce t-pentyl chloride, what was the limiting reagent in the overall reaction? GMU 2020 O…
How can we find the percentage? And the produced?
9. A mixture of 50 g H₂0 and 30 g of C6H5OH separates into two layers at 62°C. One layer, X₁, consists of 46.2% H₂O by mass; the other X2, consists of 82.7% H₂O by mass. b. What are the masses of X₁ and X₂?
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alculate the approximate volume of the vinegar sample needed for the analyses (Part A.1). Brand of vinegar or unknown no. Colauita tof White Wine Trial 1 1122809 Trial 2 Trial 1 Trial 2 e Guia 112.280g (12.822g 112.796 115 565 lis.9 1. Mass of flask (g) l15.603 2. Mass of flask + vinegar (g) 2.496 3.323 2,743 2,749 3. Mass of vinegar (g) B. Analysis of Vinegar Sample 2mL 7.5 23mL 32.コ 1. Buret reading of NaOH, initial (mL) 5.25mL 13ML amL 2. Buret reading of NaOH, final (mL) 33,3 31.2 1. Volume of NaOH used (mL) 2! mL a7.45 me 20.3 32.2 o i135 • 004 1 Molar concentration of NaOH (mol/L) Oi135 • 00 3 1003 , 063 5. Moles of NaOH added (mol) 6. Moles of CH,COOH in vinegar (mol) 7. Mass of CH,COOH in vinegar (g) 8. Percent by mass of CH,COOH in vinegar (%) 9. Average percent by mass of CH,COOH in vinegar (%) Calculations for Trial 1 of the first vinegar sample on next page. Experiment 10 137
%24 4+ dl w/ b. Be sure to answer all parts. How many moles are contained in each number of grams of table sugar (C12H22011, molar mass 342.3 g/mol)? Enter your answer in scientific notation. a. 55.0 g b. 0.0250 g x 10 mol x 10 IIO %23 2 3. 5. 9- 8. 4
MCQ 16: The problem of enhanced global warming is due to the vast amount of CO, produced by a human from past A. 100 years B. 200 years C. 300 years D. 400 years
Video data Student data Weight of Salicylic acid 2.027 g 2.014 g Weight of weighing paper .354 g 0.355 g Weight of weighing paper & Aspirin 2.711 g 2.758 g Weight of Aspirin 2.357 g 2.403 g RESULTS: Analysis of the experimental data. Molecular weight of salicylic acid Molecular weight of aspirin 138.13 g 180.17 g 1. Use the values from the DATA table and the molecular weights of salicylic acid and aspirin to determine: The predicted maximum (theoretical) yield of Aspirin (g). The experimental yield of Aspirin (g). The % yield in each experiment The average % yield for both experiments. Determine the number of aspirin tablets that could be prepared if a typical tablet contains 325 mg aspirin (the rest is starch binder and buffer to reduce the possible irritation) in each experiment. Video data Student input The Maximum yield of Aspirin (g) The experimental yield of Aspirin (g) The % yield in each experiment The average % yield Number of tablets that can be prepared