Chemistry
4th Edition
ISBN: 9780078021527
Author: Julia Burdge
Publisher: McGraw-Hill Education
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Chapter 21.3, Problem 1PPB
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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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Problem 1. It takes 5.2 min for a 1.000 - g sample of 210Fr to decay to 0.250 g. What is the half-life of 210Fr?
Problem 2. How much time is required for a 6.25 - mg sample of "Cr to decay to 0.75mg if it has a half-life of 27.8 days?
Question 45
f the half life of P-32 is 14 days, how many grams will remain after 42 days if we start with a 100.0 gram sample?
A) 50.00 grams
B) 25.00 grams
C 12.50 grams
D 6.250 grams
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Iodine-131 is administered orally in the form of NaI(aq) as a treatment for thyroid cancer. The half-life of iodine-131 is 8.04 days. If you begin with 53.0 mg of this isotope, what mass remains after 18.8 days have passed?
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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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- Intercomverting Iodine-125 is radioactive and has a half life of 60.25 days. How much of a 5.60 mg sample would be left after 88.1 days? Round your answer to 2 significant digits. Also, be sure your answer has a unit symbol. Explanation Check O 2021 McGraw-Hill Education. All Rights Reserved Terms of Use Privacy Ac MAY 10 Warrow_forwardTUTOR Writing Nuclear Equations Complete the following nuclear bombardment equation by filling in the nuclear symbol for the missing species. 92 SI 38 + 2 nn U + on Is this a nuclear fusion reaction or a nuclear fission reaction? Submit Show Approach Show Tutor Stepsarrow_forwardA chemist wishing to do an experiment requiring "Ca (half-life = 4.5 days) needs 4.0 µg of the nuclide. What mass of CaCO, must be ordered if it takes 96 h for delivery from the supplier? Assume that the atomic mass of Ca is 47.0 u. 47 Mass pg 10 Submit Answer Try Another Version 2 item attempts remaining otarrow_forward
- Exercise 2. Determine the half-life of an element If you start with 128 parent atoms of a radioactive element which has a half-life of 30 million years, then how many total millions of years does each of the following represent? SCENARIO 64 parent atoms (50%) remaining 32 parent atoms (25%) remaining 16 parent atoms (12.5%) remaining 8 parent atoms (6.25%) remaining 20 parent atoms L %) remaining # of half-lives? # of million yrs.arrow_forwardlodine-123 has a half life of 13 hours. How many hours are required for 95% of an l-123 sample to decay? hours Check Reuse Embed H5Parrow_forwardSelf-Assessment Question If we start with 1.000 g of strontium-90, 0.953 g will remain after 2 years. (a) What is the half-life of strontium-90? (b) how much strontium-90 will remain after 5 years? (c) What is the initial activity of the sample in Bq? THINKING Whee.arrow_forward
- If pure polonium-210 (k = 5.02 x 10-3 day-1) were used in a crime, based on radioactive disintegration alone, how long would it take for 30% the original isotope to disappear?Exact answerarrow_forwardProblem 3. Radium-226, which undergoes alpha decay, has a half-life of 1600yr. (a) How many alpha particles are emitted in 5.0 min by a 10.0-mg sample of 226 Ra ? (b) What is the activity of the sample in mCi ? Problem 4. Cobalt-60, which undergoes beta decay, has a half-life of 5.26yr. (a) How many beta particles are emitted in 600 s by a 3.75 – mg sample of "Co ? (b) What is the activity of the sample in Bq?arrow_forwardQuestion 30 A certain radioactive isotope has a half life of 17.9 years. What percent of a sample remains after 87.5 years? Report your answer to one decimal place. Do not input a unit. Click Submit to complete this assessmentarrow_forward
- ANSWER ASAP PLEASE Carbon-14 has a half-life of 5730 years and the radiocarbon activity of wood recently cut down is 15.0 disintegrations per minute per gram of carbon. A sample of a wooden artifact is found to undergo 7.7 disintegrations per minute per gram of carbon. What is the approximate age (in years) of the artifact? Round off the final answer to a whole number (no decimal places); no units necessary.arrow_forwardTRY CHEMWORK A certain radioactive nuclide has a half life of 3.00 hour(s). Calculate the rate constant for this nuclide. S-1 Calculate the decay rate for 1.000 mole of this nuclide. decays s-¹ Submit Submit Answer Try Another Version 1 item attempt remainingarrow_forwardExercise No. 7 NUCLEAR CHEMISTRY OBJECTIVES: 1. To write the equations of chemical for radioactive decay. 2. To calculate the energy released by the fusion process QUESTIONS AND PROBLEMS: 1. Write equations for the following examples of radioactive decay. 82 a) Beta emission of 35Br 82 b) Position emission of 35K 210 c) Alpha emission of Fo 84arrow_forward
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