CHE 110 Milestone One Draft of Public Health Issue (1) (1)

Name (please print): Fall 2022 Basic Laboratory Operations Post Lab Questions 1.) Suppose you're attempting to measure the density of a liquid that is highly volatile (it evaporates quickly). If you first measure the mass and then several minutes later you measure the volume of the liquid will the measured density be higher than the true value, lower than the true value, or the true density of the liquid. [It helps to understand this problem with the density equation.] 2.) Suppose you're attempting to measure the density of a liquid that is highly volatile (it evaporates quickly). If you first measure the volume and then several minutes later you measure the mass of the liquid will the measured density be higher than the true value, lower than the true value, or the true density of the liquid. [It helps to understand this problem with the density equation.] 3.) You're attempting to calculate the density of an alloy. The alloy is in the shape of a cylinder. If the mass of the alloy is…

За. Bromine and methanoic acid react in aqueous solution. Br, (aq) + HCO0Н (ад) — 2Br (aq) + 2H" (аq) + Со, (g) The reaction was monitored by measuring the volume of carbon dioxide produced as time progressed. o 5 10 15 20 25 [Source: © International Baccalaureate Organization 2019] 30 20 40 60 80 100 120 140 160 Time / s [Source: © International Baccalaureate Organization 2019] Determine from the graph the rate of reaction at 20 s, in cm³ s1, showing your working. 3b. Outline, with a reason, another property that could be monitored to measure the rate of this reaction. 3c. Describe one systematic error associated with the use of the gas syringe, and how the error affects the calculated rate. 3d. Identify one error associated with the use of an accurate stopwatch. Volume of carbon dioxide / cm T m mm mo

100% Correct A typical person has an average heart rate of 69.0 beats/min. Calculate the given questions. How many beats does she have in 7.0 years? How many beats in 7.00 years? And finally, how many beats in 7.000 years? Pay close attention to significant figures in this question. 47.5% In Progress 100% 7.0 years: beats Correct 60% beats In Progress 7.00 years: 0% beats 7.000 years: 100% Correct Question Credit: OpenStax College Physics 97.5% Correct 100% Correct on 100% Correct

DDT (molar mass = This ban was brought about due to the persistence of DDT in many different ecosystems, leading to high accumulations of the substance in many birds of prey. The insecticide was shown to cause a thinning of egg shells, pushing many birds towards extinction. If a 20-L drum of DDT was spilled into a pond, resulting in a DDT concentration of 354.49 g/mol) was a widely used insecticide that was banned from use in the United States in 1973. 8.66 x 10-5 M, how long would it take for the levels of DDT to reach a concentration of 1.41 x 10-7 M (a level that is generally assumed safe in mammals)? Assume the decomposition of DDT is a first-order process with a half-life of 56.0 days. Time =|| days

"71 36 K/s ill.l O 10:01 يستخدم التطبيق المیکروفون Me et من 6 / What are the goals of adding vinegar to milk 2/ What are the results of adding vinegar to milk 3 / What is the benefit of adding vinegar to milk 10:01 زهراء 21.03.17 الساعة ص 10:01

Prompt 2- How can a new substance (a gas) be produced and the total mass of the closed system not change?

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A student is preparing a solution of sucrose at a specific concentration. They are doing this by weighing out sucrose on a scale, placing it in a volumetric flask, dissolving it in water, and then diluting it up to the mark on the volumetric flask with water. How would the experimental (actual) molar concentration for C12H22O11 differ from the calculated concentration ( higher, lower, or the same) given the following scenarios? Explain.

4PH3 P4 + 6H₂ What is the rate of disappearance of PH3 from 0 to 75 seconds? Time [PH₂] [P4] [H₂] 0 2.00 0 0 75 1.50 ? ? 150 1.25 0.19 1.13 225 1.13 0.22 1.31 300 1.07 0.23 1.40 RatepH3 [?] x 10 M/s Coefficient (green) Exponent (yellow) Enter

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Module 14 Discussion: Logarithmic Application A Radiative Forcing Radiative forcing, R, measures the influence of carbon dioxide in altering the additional solar ration trapped in Earth's atmosphere. The International Panel on Climate Change (IPCC) in 1990 estimated k to be 6.3 in the radiative forcing equation R = k In(), where Co is the preindustrial amount of carbon dioxide and C is the current level. (Data from Clime, W., The Economics of Global Warming, Institute for International Economics, Washington, D.C.) (a) Use the equation R = 6.3 In() to determine the radiative forcing R, in watts per square meter (W) to the nearest tenth, expected by the IPCC if the carbon dioxide level in the atmosphere doubles from its preindustrial level. (b) Determine the global temperature increase T, in degrees Fahrenheit to the nearest tenth, that the IPCC predicted would occur if atmospheric carbon dioxide levels were to double, given T(R) = 1.03R. Search entries or author Unread 96 4444 ↑ Oll 7…

Remaining Time: 01:18:00 Iron, Fe, will reduce arsenic acid, H3ASO4, to produce highly poisonous arsine gas, AsH3, according to the following equation. 8 Fe3*(aq) 3 H3ASO4(aq) + 8 Fe(s) + 24 H*(aq) → 3 ASH3(g) + 12 H20(I) + Molar masses: Fe = 55.85 g mol; H3ASO4 = 141.94 g mol-1 What mass of iron would be required to react with 290 mL of 0.650 mol L¯1 H3ASO4(aq)? Enter a mass accurate to 3 significant figures. Number Submit Assignment Quit & Save Вack Question Menu - Next MacBook Air DII DD F12 F11 F10 F8 F9 F6 F7 * 7 8 9. { P

A 20-mm cube of copper metal is placed in 250 mL of 12 M nitric acid at 25°C and the reaction below occurs: Cu(s) + 4H+ (aq) + 2NO3(aq) -> Cu²+ (aq) + 2NO2(g) + 2H₂O(1) At a particular instant in time, nitrogen dioxide is being produced at the rate of 4.4 x 10-4 M/min. At this same instant, what is the rate at which hydrogen ions are being consumed in M/min? Do not write unit in answer. Report your answer with five places past the decimal point. Type your answer...

Use the information given here to answer both questions (4 and 5).  For the fictitious reaction:  AB → A + B Some data was collected measuring the [AB] at certain time intervals.  This data was then graphed as described below. A graph of 1/[AB] versus time (s) gives a straight line with the equation: y = 0.0052x + 0.1135 and a R2 = 0.9995.  A graph of ln[AB] versus time (s) gives a straight line with the equation: y = -0.0068x + 1.725 and a R2 = 0.8925.   Assume the data doesn't fit a zero order reaction. What is the rate law for this reaction? Select one: a. Rate = k[AB]2 b. Rate = k[A][B] c. Rate = k[AB] d. Rate = k   Using the data from the previous question. What is the value of the rate constant for the given reaction? Select one: a. k = 0.0052 M-1s-1 b. k = 0.0157 Ms-1 c. k = 0.0068 s-1 d. There is no way to determine the value of the rate constant from the given information.

How Long it Might Take for PFOA Blood Levels to Decline Assumes a 3-year half-life (Micrograms per Liter) 100 Average PFOA Levels in Blood (Micrograms per Liter) 3M Workers, Decatur, AL 1,125 This figure estimates a 3-year half-life of PFOA levels in blood at different starting levels of exposure. PFOA levels decrease by about half every two to four years. 90 Dupont Workers, Parkersburg. WV 410 80 C8 Study: Little Hocking. OH 228 A half-life is the amount of time it takes C8 Study: Lubeck, wV 92 for PFOA levels in blood to be reduced 70 by half. C8 Study: Tuppers Plains, OH 42 * The level shown for PFOA in blood for the Hoosick Falls area is the geometric mean and is based on test results for 2,081 participants including people using Village water, people using private wells, people who work in the area, and former residents. 60 Hoosick Falls area, NY I 23.5* C8 Study: Mason County, WV I 16 50 U.S. Population Geometric means are a way of calculating the middle level. They are used in…

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