M1 Problem Set

4. Complete the following equations. ? ? он

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?

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?

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

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…

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?

Answer question 7 please

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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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)?

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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Direction: Complete the following equations. 1. 238 U→ 23490 Th + –_He _U> 226 Ra → 222 256 | 2. _Th +-_a 252 °103 Lr → Pd→-46 Pd +-_Y -88 Ra →21886 Rn +-_He U 238 92 23490 Th → 234 _Na →2 6027Co >- 3. 101 Md +-a | 238 4. 5. | 6. +-_Y Pa +-_B 12 Mg +-_e + 42 He -_Li+-_B 11. 208 84 Po →-_Pb +-_a 12. Li→一4_+-_B 13. 131 531 --54 Xe +-_e 7. 8. - 9. 10. 2 He | 14. 250 66Dy>-6 15. 237 93Np - +-_Y +-_a

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

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

Which one is it?