Breach Notification Letter

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?

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Find the associated exponential decay or growth model. (Round all coefficients to three significant digits.) Q = 1,500 when t = 0; half-life = 1   Q=

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Create a model that explains a nuclear reaction within the context of its application :  Nuclear fission reactors  An equation for the nuclear reaction in your model  A visual representation of the nuclear reaction occurring  A written explanation of the reaction and how energy and matter are transformed and conserved throughout the reaction  The context and/or application of the nuclear reaction  Where does the reaction occur?  What impact or relevance does this reaction have to society?

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

3) You're wandering around and come upon an interesting looking rock. The rock is slightly radioactive, so you analyze it. The resulting data is as follows: Elapsed Time (s) Counts 962 50 891 100 718 150 598 200 531 250 448 300 413 350 334 400 308 450 287 500 202 550 178 600 154 a. Calculate the value of k using any two of the above data points. b. Use your value of k to determine the half-life of this sample.

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

I need help with part b please

In 2021, Beta Corporation earned gross profits of $790,000. a. Suppose that Beta was financed by a combination of common stock and $1.03 million of debt. The interest rate on the debt was 9%, and the corporate tax rate in 2021 was 21%. How much profit was available for common stockholders after payment of interest and corporate taxes? b. Now suppose that instead of issuing debt, Beta was financed by a combination of common stock and $1.03 million of preferred stock. The dividend yield on the preferred was 7%, and the corporate tax rate was still 21%. Recalculate the profit available for common stockholders after payment of preferred dividends and corporate taxes. Note: Do not round intermediate calculations. Enter your answers in dollars not millions and round your answers to the nearest whole dollar amount.

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

A certain drug has a half-life in the body of 2.0 h. Suppose a patient takes one 200. mg pill at 5:00PM and another identical pill 45 min later. Calculate the amount of drug left in his body at 7:00PM. Be sure your answer has a unit symbol, if necessary, and round it to 3 significant digits. | mg

Strontium-90 (Sr-90), a radioactive isotope of strontium, is present in the fallout resulting from nuclear explosions. It is especially hazardous to animal life, including humans, because, upon ingestion of contaminated food, it is absorbed into the bone structure. Its half-life is 27 yr. If the amount of Sr-90 in a certain area is found to be eight times the "safe" level, find how much time must elapse before an "acceptable level" is reached.

Which of the following questions would not be of scientific importance? Note: there is more than one correct answer here. a. Does fracking affect the frequency of severe earthquakes? b. What was the best album of 2022? C. What were the radiation levels of the Three Mile Island meltdown? d. Who is the fastest-The Flash, Quicksilver or Sonic the Hedgehog? e. Is there a possible vaccine for RSV?

Q5: Energetic neutrons bombard an aluminum foil of thickness 0.20 mm. The aluminum nuclei undergo neutron capture according to the process 27AI (n, y) 28AI, with a measured capture cross section of (2.0 10-3 b). Assuming the flux of incident neutrons to be (7.0*1012 neutrons/cm?.s), calculate the number of neutrons captured per second by 1.0 cm-2 of the foil, and what is the enough thickness to capturing the all neutrons.

a)How many moles of N2O5 will remain after 4.0 min ? Express the amount in moles to two significant digits. b)How many minutes will it take for the quantity of N2O5to drop to 1.7×10−2 mol ? Express your answer using two significant figures. c)What is the half-life of N2O5 at 70∘C? Express the half-life in seconds to three significant digits.

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

22:26 Wed 25 Aug Question 10 of 20 A tank with 43.2 kg of water is leaking at a rate of 0.0135 kg/s . How many hours will it take until the tank is completely empty? STARTING AMOUNT ADD FACTOR ANSWER RESET *( ) 3600 1000 0.0135 0.583 53.3 0.889 1 3.20 x 103 60 43.2 0.001 hr min kg S kg/s

For this question you will need to work all of your answers on scratch paper. Once completed, upload an image of your answers showing all work and dearly identifying your answers. Use the Browse My Computer button to upload an image. The following data was collected for the formation of N205. By reaction of NO2 and 0₂ 4NO2 02 2N₂Os Time in Mantes 10.0 20.0 30.0 40.0 50.0 60.0 70.0 10.0 90.0 100.0 [0₂] units of Molarity 0.0078 0.0077 0.0075 0.0072 0.0065 0.0063 0.0057 0.0048 0.0056 0.0021 0.0010 a. Show all your work, what is the average rate of the reaction? b. Show all your work, what is the instantaneous rate from 10.0 to 40.0 minutes? c. Show all your work, what is the instantaneous rate from 30.0 to 60.0 minutes? d. Show all your work, what is the instantaneous rate from 50.0 to 90.0 minutes?

You will research how the energy is extracted or produced and try to be very detailed about the process and the chemistry involved (stating equations and reactions). You will also research the impact on the environment when using or producing fuels. Investigating fossil fuel: How is it produced? What is the chemistry involved (stating equations and reactions)? What is the impact on the environment? 300-400 words Investigating nuclear energy: How is it produced? What is the chemistry involved (stating equations and reactions)? What is the impact on the environment? 300-400 words Investigating biofuel: How is it produced? What is the chemistry involved (stating equations and reactions)? What is the impact on the environment? 300-400 words

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