M3 Problem Set

2Na(s) +2H2O(l) → H2 (g) + 2Na+(aq) +2OH-(aq) Considering this equation, what evidence would you look for and what tests would you perform as evidence that the reaction taken place is the one predicted?

A Water Quality Standard will be developed for radioactive isotope “Iron-55” which has physical (radioactive) and biological half-lives of 2.7 and 1.6 years, respectively. Through toxicological studies scientists decided “spleen” as the critical organ and the critical accumulation of Iron-55 in spleen has been determined to be 0.5 gram. Assuming radioactive exposure is only due to drinking water consumption and average life expectancy is 75 years. a) What should be the Maximum Concentration Level (MCL) as mg/L for Iron-55 in drinking water.  b) How long does it take to eliminate 95% of this radioactive isotope from human spleen after the person gives up on drinking water contaminated with Iron-55?

teaching and 1. x n/takeAssignment/takeCovalentActivity.do?locator=assignment-take u_ Free Online Survey... + Source Naturally Occurring Radiation Cosmic rays Terrestrial radiation (rocks, buildings) Inside human body (K-40 and Ra-266 in the bones) Radon in the air Total Artificial Radiation Medical Xrays Nuclear medicine Consumer products Nuclear power plants All others Total Grand total 70 9 Average Exposure to Radiation from Common Sources 5 PRE Home - Academia... An error has been detected in your answer. Check for typos. miscalculations etc. before submitting your answer. 48 6 *** & Use the data on the table to calculate the percentage of total annual radiation from naturally occuring sources that the average person receives from terrestrial radiation (rocks, buildings). 4 4- 7 hp Modules Create Your Rubric... • 4+ 8 Dose (mrem/year) 7.52 27 28 39 200 294 9 39 14 10 0.5 1.5. 65.0 359 percent ho O The Utility Experts ... f11 ▶▶ A f12 Previous Email Instructor ❤ insert Next> Save an…

Try Again Your answer is wrong. In addition to checking your math, check that you used the right data and DID NOT round any intermediate calculations. A certain drug has a half-life in the body of 3.5 h. Suppose a patient takes one 300. mg pill at 7:00PM and another identical pill 45 min later. Calculate the amount of drug left in his body at 10:00PM. Be sure your answer has a unit symbol, if necessary, and round it to 3 significant digits. 559. mg x10 X

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Plot your values of In(Ksp) VS. 1/Tand find the slope and y-intercept of the best fit line. Use the equation for the best fit line and the following equation In(K) = - AH° RT AS° R to calculate AH and AS for dissolving Borax What is the slope of your best fit line in the plot? What is AH (kJ/mol)? What is the y-intercept of your best fit line in the plot? What is AS (J/mol)?

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Choose the factor below that is likely to have led to the greatest number of mass extinctions.     Earthquakes UV radiation Temperature change Asteroids

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Hydrochloric acid can be prepared by the following reaction: 2NACI(s) + H2SO4(aq)2HCI(g) + Na2SO4(s) What mass of HCI can be prepared from 2.00 mol H SO4 and 150. g NaCl? Multiple Choice 2.57 g 167 g 93.6 g 11 asus COLLECTION prt sc delete 112/A insert f7 f8 f11

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Part A Which route would be better: one that produces a small amount of hazardous waste or one that produces a large amount of nonhazardous waste? Which green chemistry metric accounts for this dilemma? Match the items in the left column to the appropriate blanks in the sentences on the right. Reset Help minimize The best route is because it should the E-factor and maximize the effective mass yield. the one that produces a small The accounts for this dilemma as it looks at the amount of relative to amount of hazardous waste the amount of E-factor product made the one that produces a large amount nonhazardous waste materials used difficult to choose hazardous reagents used waste produced Submit Previous Answers Request Answer

ssignment/takeCovalent Activity.do?locator=assignment-take d... Communication s... 1.00 x 10-8 +1.71 x 10- -4 [References] Use the References to access important values if needed for this question. It is often necessary to do calculations using scientific notation when working chemistry problems. For practice, perform each of the following calculations. 2.37 x 104 +2.12 × 105 9.60 × 104 (1.00 QUT_Teamwork_... 28 7.00 × 10-5 0-8) (1.71 x 10-4) x 10 Submit Answer Retry Entire Group Aa Developing effecti... MacBook Pro Time managemen 3 more group attempts remaining Previous Next

Experiment 4: Preparation and Properties of Hydrogen and Oxygen Gases Toriana Mieer -Jones Name: Section: Lab Instructor: L/26 Date: Pre-Lab Exercise 4 1. In this experiment, simple chemical reactions are used to generate small quantities of hydrogen and oxygen gases. These methods would be too expensive and too complicated if large quantities of these gases were needed, however. Use your textbook, a chemical encyclopedia, or an online source to look up the major industrial methods of preparing very large quantities of these gases. Summarize your findings here. ono od te led bateono to n

What is the major ingredient of Tums tablets used in today's experiment ? - Mg(OH)2 - NaHCO3 - KHCO3 - CaCO3 - Ca(OH)3

Can you identify the acceptable exposure limits for affected populations in occupational and nonoccupational environments?

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Search for Life Transfer Task 1 - Poisoned Shopworkers Back in 1920, one of the most sought-after jobs on the East Coast was a dial painter at a watch factory. These workers were all female, and they absolutely loved their jobs. These girls were instructed to paint the number on a watch with paint laced with an element called radium. Years later, many of these workers developed many medical problems with their bones. Some girls lost their jaw bones, and others’ bones broke when they walked across a room. Several doctors thought that phosphorus poisoned the girls’ bones. Their companies insisted that radium was not damaging their bones in order to avoid a lawsuit.  Answer the questions below to answer the big questions: Was it the radium or the phosphorus that poisoned the girls’ bones?  Were the factories responsible for the girls’ sicknesses?

If the intensity of radiation is 255 microcuries (μCi) at a distance of 1.74 m, what is the intensity at a distance of 2.87 m? Intensity = _____ μCi

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