Chemistry
4th Edition
ISBN: 9780078021527
Author: Julia Burdge
Publisher: McGraw-Hill Education
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Chapter 21.3, Problem 1PPB
Practice Problem 
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How long will it take for the radioactivity due to radon to fall to a level considered acceptable by the EPA if the starting activity is
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Radioactive radon-222, found in many homes, is a potential health hazard.
The half-life of radon-222 is 3.82 days. If you begin with 75.5 milligrams of radon-222, how many milligrams will you have left after 11.5 days have passed?
__________-mg
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A river water sample of 25°C is contaminated with diazepam with initial concentration of 5000 ppb (or ng/L) when it secondary biodegradation rate in water, Kd = 10^1.3 (cu cm/mol-sec) at 25°C and molar mass of diazepam is 284.7g/mol. What is the half life of the diazepam in hours?
Note: I need right answer with clear calculations.
Lead-194 has a half-life of 11 minutes. A sample of lead-194 with a mass of 0.149g is allowed to decay for 66 minutes. What mass of lead-194 in grams remains in the sample after 66 minutes?
a. 2.33 x 10 -3
b. 2.48 x 10 -4
c. 2.25 x 10 -4
d. 1.35 x 10 -2
e. no correct response
Chapter 21 Solutions
Chemistry
Ch. 21.1 - Practice Problem ATTEMPT Calculate the wavelength...Ch. 21.1 - Practice Problem BUILD Which of the following...Ch. 21.1 - Prob. 1PPCCh. 21.1 - Prob. 1CPCh. 21.1 - Prob. 2CPCh. 21.2 - Practice Problem ATTEMPT which of the following is...Ch. 21.2 - Practice Problem BUILD Both O 2 and O 3 exhibit...Ch. 21.2 - Prob. 1PPCCh. 21.2 - 21.2.1 What maximum wavelength (in nm) of fight is...Ch. 21.2 - What process gives rise to the aurora borealis and...
Ch. 21.3 - Prob. 1PPACh. 21.3 - Practice Problem BUILD How long will it take for...Ch. 21.3 - Prob. 1PPCCh. 21.8 - Prob. 1CPCh. 21.8 - Prob. 2CPCh. 21 - Prob. 1QPCh. 21 - Prob. 2QPCh. 21 - Prob. 3QPCh. 21 - Prob. 4QPCh. 21 - Referring to Table 21.1, calculate the mole...Ch. 21 - Prob. 6QPCh. 21 - Prob. 7QPCh. 21 - Calculate the mass (in kg) of nitrogen, oxygen,...Ch. 21 - 21.9 What process gives rise to the aurora...Ch. 21 - Prob. 10QPCh. 21 - The highly reactive OH radical (a species with an...Ch. 21 - The green color observed in the aurora borealis is...Ch. 21 - Prob. 13QPCh. 21 - Prob. 14QPCh. 21 - Prob. 15QPCh. 21 - Prob. 16QPCh. 21 - What causes the polar ozone holes?Ch. 21 - How do volcanic eruptions contribute to ozone...Ch. 21 - Prob. 19QPCh. 21 - Discuss the effectiveness of some of the CFC...Ch. 21 - Prob. 21QPCh. 21 - Prob. 22QPCh. 21 - Prob. 23QPCh. 21 - Prob. 24QPCh. 21 - Prob. 25QPCh. 21 - Prob. 26QPCh. 21 - Prob. 27QPCh. 21 - Prob. 28QPCh. 21 - Prob. 29QPCh. 21 - Prob. 30QPCh. 21 - Prob. 31QPCh. 21 - Prob. 32QPCh. 21 - Describe three human activities that generate...Ch. 21 - Prob. 34QPCh. 21 - Prob. 35QPCh. 21 - Prob. 36QPCh. 21 - What effects do CFCs and their substitutes have on...Ch. 21 - Why are CFCs more effective greenhouse gases than...Ch. 21 - Prob. 39QPCh. 21 - Calcium oxide or quicklime ( CaO ) is used in...Ch. 21 - Prob. 41QPCh. 21 - 21.42 List three detrimental effects of acid...Ch. 21 - 21.43 Briefly discuss two industrial processes...Ch. 21 - Discuss ways to curb acid rain.Ch. 21 - Prob. 45QPCh. 21 - Prob. 46QPCh. 21 - Prob. 47QPCh. 21 - Identify the gas that is responsible for the brown...Ch. 21 - 21.49 The safety limits of ozone and carbon...Ch. 21 - Prob. 50QPCh. 21 - Prob. 51QPCh. 21 - 21.52 The gas-phase decomposition of peroxyacetyl...Ch. 21 - 21.53 On a smoggy day in a certain city. the ozone...Ch. 21 - Prob. 54QPCh. 21 - What is the best way to deal with indoor...Ch. 21 - Why is it dangerous to idle a car's engine in a...Ch. 21 - Prob. 57QPCh. 21 - Prob. 58QPCh. 21 - Prob. 59QPCh. 21 - Prob. 60APCh. 21 - Prob. 61APCh. 21 - Prob. 62APCh. 21 - Prob. 63APCh. 21 - Prob. 64APCh. 21 - 21.65 How are past temperatures determined from...Ch. 21 - The balance between SO 2 and SO 3 is important in...Ch. 21 - Prob. 67APCh. 21 - 21.68 A glass of water initially at pH 7.0 is...Ch. 21 - Prob. 69APCh. 21 - 21.70 Instead of monitoring carbon dioxide,...Ch. 21 - Describe the removal of SO 2 by CaO (to form CaSO...Ch. 21 - 21.72 Which of the following settings is the most...Ch. 21 - Prob. 73APCh. 21 - Peroxyacetyl nitrate (PAN) undergoes thermal...Ch. 21 - Prob. 75APCh. 21 - Prob. 76APCh. 21 - 21.77 The carbon dioxide level in the atmosphere...Ch. 21 - Prob. 78APCh. 21 - Prob. 79APCh. 21 - 21.80 A person was found dead of carbon monoxide...Ch. 21 - Prob. 81APCh. 21 - Prob. 82APCh. 21 - The molar heat capacity of a diatomic molecule is...Ch. 21 - Prob. 84APCh. 21 - Prob. 85APCh. 21 - Prob. 86APCh. 21 - Prob. 1SEPPCh. 21 - Prob. 2SEPPCh. 21 - Prob. 3SEPPCh. 21 - Prob. 4SEPP
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.Similar questions
- Problem 9-5 Barium-122 has a half-life of 2 minutes. Suppose you obtained a sample weighing 10.0 g and it takes 10 minutes to set up an experiment in which the barium-122 is to be used. How many grams of barium-122 will remain at the point when you begin the experiment?arrow_forwardProblem 9-6 A radioactive isotope in a 9.0-mL vial has an intensity of 300. mCi. A patient is required to take 50. mCi intravenously. How much liquid should be used for the injection?arrow_forwardProblem 9-1 Iodine-139 is a beta emitter. Write an equation for this nuclear reaction and identify the product formed.arrow_forward
- How did you get this? k===0.693t1/20.69315 hrs0.0462 hrs−1k=0.693t1/2=0.69315 hrs=0.0462 hrs 0.693 a 102.0 nanogram(ng) sample of sodium-24 was stored in a lead-lined cabinet for 2.5 days How much sodium-24 remained? The half-life os sodium -24 is 15 hours _________ ng sodium -24 remain check_circle Expert Answer thumb_up thumb_down Step 1 Radioactive decay is a first order reaction. Conversion of days into hours: 1 day2.5 days===24 hrs2.5×2460 hrs1 day=24 hrs2.5 days=2.5×24=60 hrs Calculation of k: k===0.693t1/20.69315 hrs0.0462 hrs−1k=0.693t1/2=0.69315 hrs=0.0462 hrs-1 Step 2 Radioactive decay is a first order reaction, therefore: [A]=[Ao] e−kt[A]=[Ao] e-kt where [A] is the final amount remained at time t, [Ao] is the initial amount. Putting values: [A]====102.0 ng×e−0.0462 hrs−1×60 hrs102.0 ng×e−2.772102.0 ng×0.062546.38 ng[A]=102.0 ng×e-0.0462 hrs-1×60 hrs=102.0 ng×e-2.772=102.0 ng×0.06254=6.38 ng Thus 6.38 ng of sodium-24 remained.arrow_forwardProblem 9-2 Thorium-223 is an alpha emitter. Write an equation for this nuclear reaction and identify the product formed.arrow_forwardPotassium-44 decays by beta emission with a half-life of 22 minutes. A 125mg sample of the isotope is allowed to decay for 88 minutes. What mass of K-44 in mg remains in the sample after the 88 minutes? a. 7.81mg b. 15.6mg c. 31.5mg d. 62.5mg e. no correct responsearrow_forward
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