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ChemistryChemistry: An Atoms First ApproachThe heaviest member of the alkaline earth metals is radium (Ra), a naturally radioactive element discovered by Pierre and Marie Curie in 1898. Radium was initially isolated from the uranium ore pitchblende, in which it is present as approximately 1.0 g per 7.0 metric tons of pitchblende. How many atoms of radium can be isolated from 1.75 × 10 8 g pitchblende (l metric ton = 1000 kg)? One of the early uses of radium was as an additive to paint so that watch dials coated with this paint would glow in the dark. The longest-lived isotope of radium has a half-life of 1.60 × 10 3 years. If an antique watch, manufactured in 1925, contains 15.0 mg radium, how many atoms of radium will remain in 2025?

The heaviest member of the alkaline earth metals is radium (Ra), a naturally radioactive element discovered by Pierre and Marie Curie in 1898. Radium was initially isolated from the uranium ore pitchblende, in which it is present as approximately 1.0 g per 7.0 metric tons of pitchblende. How many atoms of radium can be isolated from 1.75 × 10 8 g pitchblende (l metric ton = 1000 kg)? One of the early uses of radium was as an additive to paint so that watch dials coated with this paint would glow in the dark. The longest-lived isotope of radium has a half-life of 1.60 × 10 3 years. If an antique watch, manufactured in 1925, contains 15.0 mg radium, how many atoms of radium will remain in 2025?

BuyFind

Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
BuyFind

Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243

Solutions

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Chapter 19, Problem 106IP
Textbook Problem

The heaviest member of the alkaline earth metals is radium (Ra), a naturally radioactive element discovered by Pierre and Marie Curie in 1898. Radium was initially isolated from the uranium ore pitchblende, in which it is present as approximately 1.0 g per 7.0 metric tons of pitchblende. How many atoms of radium can be isolated from 1.75 × 108 g pitchblende (l metric ton = 1000 kg)? One of the early uses of radium was as an additive to paint so that watch dials coated with this paint would glow in the dark. The longest-lived isotope of radium has a half-life of 1.60 × 103 years. If an antique watch, manufactured in 1925, contains 15.0 mg radium, how many atoms of radium will remain in 2025?

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Chapter 19 Solutions

Chemistry: An Atoms First Approach
Ch. 19 - What are the two most abundant elements by mass in...Ch. 19 - What evidence supports putting hydrogen in Group...Ch. 19 - What is the valence electron configuration for...Ch. 19 - What is the valence electron configuration for the...Ch. 19 - What is the valence electron configuration for...Ch. 19 - What is the valence electron configuration for...Ch. 19 - Table 19-14 lists some common nitrogen compounds...Ch. 19 - What is the valence electron configuration of...Ch. 19 - What is the valence electron configuration of the...Ch. 19 - What special property of the noble gases makes...
Ch. 19 - Although the earth was formed from the same...Ch. 19 - List two major industrial uses of hydrogen.Ch. 19 - How do the acidities of the aqueous solutions of...Ch. 19 - Diagonal relationships in the periodic table exist...Ch. 19 - Atomic size seems to play an important role in...Ch. 19 - Silicon carbide (SiC) is an extremely hard...Ch. 19 - In most compounds, the solid phase is denser than...Ch. 19 - What is nitrogen fixation? Give some examples of...Ch. 19 - All the Group 1A (1) and 2A (2) metals are...Ch. 19 - Why are the tin(IV) halides more volatile than the...Ch. 19 - Hydrogen is produced commercially by the reaction...Ch. 19 - The major industrial use of hydrogen is in the...Ch. 19 - Write balanced equations describing the reaction...Ch. 19 - The electrolysis of aqueous sodium chloride...Ch. 19 - Refer to Table 19-5 and give examples of the three...Ch. 19 - Label the following hydrides as ionic, covalent,...Ch. 19 - Many lithium salts are hygroscopic (absorb water),...Ch. 19 - What will be the atomic number of the next alkali...Ch. 19 - One harmful effect of acid rain is the...Ch. 19 - Write balanced equations describing the reaction...Ch. 19 - What mass of barium is produced when molten BaCl2...Ch. 19 - How long will it take to produce 1.00 103 kg of...Ch. 19 - Beryllium shows some covalent characteristics in...Ch. 19 - What ions are found in hard water? What happens...Ch. 19 - Consider element 113. What is the expected...Ch. 19 - Thallium and indium form + 1 and + 3 oxidation...Ch. 19 - Boron hydrides were once evaluated for possible...Ch. 19 - Elemental boron is produced by reduction of boron...Ch. 19 - Write equations describing the reactions of Ga...Ch. 19 - Write a balanced equation describing the reaction...Ch. 19 - Al2O3 is amphoteric. What does this mean?Ch. 19 - What are three-centered bonds?Ch. 19 - Discuss the importance of the C8C and Si8Si bond...Ch. 19 - Besides the central atom, what are the differences...Ch. 19 - The following illustration shows the orbitals used...Ch. 19 - In addition to CO2, two additional stable oxides...Ch. 19 - Silicon is produced for the chemical and...Ch. 19 - Write equations describing the reactions of Sn...Ch. 19 - The compound Pb3O4 (red lead) contains a mixture...Ch. 19 - Tin forms compounds in the +2 and +4 oxidation...Ch. 19 - The oxyanion of nitrogen in which it has the...Ch. 19 - In each of the following pairs of substances, one...Ch. 19 - Write balanced equations for the reactions...Ch. 19 - Arsenic reacts with oxygen to form oxides that...Ch. 19 - The Group 5A (15) elements can form molecules or...Ch. 19 - Compare the Lewis structures with the molecular...Ch. 19 - Many oxides of nitrogen have positive values for...Ch. 19 - Using data from Appendix 4 calculate H, S, and G...Ch. 19 - In many natural waters, nitrogen and phosphorus...Ch. 19 - Phosphate buffers are important in regulating the...Ch. 19 - Phosphoric acid (H3PO4) is a triprotic acid,...Ch. 19 - Trisodium phosphate (TSP) is an effective grease...Ch. 19 - Use bond energies to estimate the maximum...Ch. 19 - The xerographic (dry writing) process was invented...Ch. 19 - Write a balanced equation describing the reduction...Ch. 19 - Complete and balance each of the following...Ch. 19 - Ozone is desirable in the upper atmosphere but...Ch. 19 - Ozone is a possible replacement for chlorine in...Ch. 19 - How can the paramagnetism of O2 be explained using...Ch. 19 - Describe the bonding in SO2 and SO3 using the...Ch. 19 - Write the Lewis structure for O2F2. Predict the...Ch. 19 - Give the Lewis structure, molecular structure, and...Ch. 19 - Fluorine reacts with sulfur to form several...Ch. 19 - Predict some possible compounds that could form...Ch. 19 - How does the oxyacid strength of the halogens vary...Ch. 19 - Explain why HF is a weak acid, whereas HCI, HBr,...Ch. 19 - The xenon halides and oxides are isoelectronic...Ch. 19 - For each of the following, write the Lewis...Ch. 19 - Although He is the second most abundant element in...Ch. 19 - The noble gas with the largest atmospheric...Ch. 19 - There is evidence that radon reacts with fluorine...Ch. 19 - For the RnFx compounds you predicted in Exercise...Ch. 19 - Hydrazine (N2H4) is used as a fuel in...Ch. 19 - The inert-pair effect is sometimes used to explain...Ch. 19 - How could you determine experimentally whether the...Ch. 19 - The resistivity (a measure of electrical...Ch. 19 - Slaked lime, Ca(OH)2 is used to soften hard water...Ch. 19 - EDTA is used as a complexing agent in chemical...Ch. 19 - Photogray lenses contain small embedded crystals...Ch. 19 - Draw Lewis structures for the AsCl4+ and AsCl6...Ch. 19 - Provide a reasonable estimate for the number of...Ch. 19 - In large doses, selenium is toxic. However, in...Ch. 19 - In the 1950s and 1960s, several nations conducted...Ch. 19 - What is a disproportionation reaction? Use the...Ch. 19 - Sulfur forms a wide variety of compounds in which...Ch. 19 - Halogens form a variety of covalent compounds with...Ch. 19 - Hydrogen gas is being considered as a fuel for...Ch. 19 - Molten CaC12 is electrolyzed for 8.00 h to produce...Ch. 19 - Calculate the solubility of Mg(OH)2 (Ksp = 8.9 ...Ch. 19 - Which of the following statement(s) is(are) true?...Ch. 19 - What is the hybridization of the underlined...Ch. 19 - Nitrous oxide (N2O) can be produced by thermal...Ch. 19 - What is the hybridization of the central atom in...Ch. 19 - What is the molecular structure for each of the...Ch. 19 - The atmosphere contains 9.0 106% Xe by volume at...Ch. 19 - Which of following statement(s) is/are true? a....Ch. 19 - Suppose 10.00 g of an alkaline earth metal reacts...Ch. 19 - From the information on the temperature stability...Ch. 19 - Lead forms compounds in the +2 and +4 oxidation...Ch. 19 - Many structures of phosphorus-containing compounds...Ch. 19 - Use bond energies (see Table 3-3) to show that the...Ch. 19 - A proposed two-step mechanism for the destruction...Ch. 19 - You travel to a distant, cold planet where the...Ch. 19 - Nitrogen gas reacts with hydrogen gas to form...Ch. 19 - A cylinder fitted with a movable piston initially...Ch. 19 - The heaviest member of the alkaline earth metals...Ch. 19 - lndium(III) phosphide is a semiconducting material...Ch. 19 - Although nitrogen trifluoride (NF3) is a thermally...Ch. 19 - While selenic acid has the formula H2SeO4 and thus...Ch. 19 - Captain Kirk has set a trap for the Klingons who...Ch. 19 - Use the symbols of the elements described in the...

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