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Bananas are somewhat radioactive due to the presence ofsubstantial amounts ofpotassium. Potassium 40 decays by two...
4. (20 pts) Potassium-Argon dating is used in geology and archeology to date sedimentary rocks. Potassium...
4. (20 pts) Potassium-Argon dating is used in geology and archeology to date sedimentary rocks. Potassium 40 decays by two different paths: 10K → 20Ca + _e (89.3%) 10K → 18 Ar+je (10.7%) The overall half-life of for the decay of potassium-40 is 1.3 x 100 years. Estimate the age of sedimentary rocks with an Argon 40 to Potassium 40 ratio of 0.0102.
Reactivity and Decay A banana in your lunch contains 380 mg of potassium, of which a...
Reactivity and Decay
A banana in your lunch contains 380 mg of potassium, of which a small fraction is the radioactive isotope 40 19 K. Using the percentage of radioactive potassium to nonradioactive potassium in Appendix B, estimate the activity of this banana due to the radioactive 40 19 K. decays/s
The isotope 40K can decay to either 40Ca or 40Ar; assume both decays have a half-life...
The isotope 40K can decay to either 40Ca or 40Ar; assume both decays have a half-life of 1.26 X 109 y. The ratio of the Ca produced to the Ar produced is 8.54/1=8.54. A sample originally had only 40K. It now has equal amounts of 40K and 40Ar; that is the ratio of K to Ar is 1/1=1. How old is the sample? (Hint: work this like other radioactive-dating problems, except that this decay has two products).
Electrochemistry 1.Consider the Daniel Cell at the indicated molalities: Zn(s)|ZnSO4(aq, 0.100 M)||CuSO4(aq, 0.500 M)|Cu(s) a) Calculate...
Electrochemistry 1.Consider the Daniel Cell at the indicated molalities: Zn(s)|ZnSO4(aq, 0.100 M)||CuSO4(aq, 0.500 M)|Cu(s) a) Calculate the ionic strength I and mean activity coefficient (gamma+-) for each species, the latter using the Debye - Hückel limiting law, and compare this value to those found in the data tables (i.e., (gamma +-),ZnSO4 = 0.150 at 0.100 M; (gamma +-),CuSO4 = 0.0620 at 0.500 M). b) Calculate E using the molalities indicated in the above Cell...
ReviewI Constants The technique known as potassium-argon dating is used to date volcanic rock and ash, and thus establish dates for nearby fossils like this hominid skull.(Figure 1) The potassi...
ReviewI Constants The technique known as potassium-argon dating is used to date volcanic rock and ash, and thus establish dates for nearby fossils like this hominid skull.(Figure 1) The potassium isotope "0K has a 1.28-billion-year half-life and is naturally present at very low levels. Its most common decay mode is beta-minus decay into the stable isotope 40 Ca, but 10.9% of its decays are beta-plus which result in the creation of the stable isotope 40 Ar. The high temperatures in...
5. Assume that the economy of Fruitland can produce two goods, apples (A) and bananas (B)....
5. Assume that the economy of Fruitland can produce two goods, apples (A) and bananas (B). The production of one apple requires one unit of labor (L) and two units of capital (K). One banana requires two units of labor and one unit of capital. Fruitland is endowed with 600 units of labor and 600 units of capital. a. Draw the production possibilities frontier (curve) for Fruitland. Put apples (A) on the vertical axis. (HINT: For every 20 apples, determine...
The voltaic cell is made of the following two electrodes: 9. Fe (0.200 M) 2e Fe(s)...
The voltaic cell is made of the following two electrodes: 9. Fe (0.200 M) 2e Fe(s) E.d= -0.44 v, Fe(0.100 M) e Fe (0.200 M) Eed0.77 v. Which electrode works as an anode? (20 pt) al Write the cell reaction. b) Calculate E°cell and Ecel. cl 10. A Cr(ag) solution is electrolyzed, using a current of 5.30 A for 2.00 days. What mass of Cr(s) (AM: 52.0) is plated out? (F=96485 C /mol) 11. For nuclear reaction occurred in the...
10. Based on Periodic Table positions, only this set has two elements that would have similar...
10. Based on Periodic Table positions, only this set has two elements that would have similar chemical properties: A. 11 Na, 12Mg. sXe, ssCs B. 13A, 14S, SP. As C. 13A, 18K, Ge, Sn. D. SF, Zr, son, sal 11. The IUPAC name of Ba(CIO) is A. Barium chloride B. Barium chlorite C. Barium perchlorate D. Barium chlorate 12. The correct order of increasing effective nuclear charge is AK <Mg <P <NO B. Mg <K<P <NO C.O <N<P < Mg...
PHYS 3043, Spring 19, HW#1 due Wed, Jan 23, by 3:00 pm 1) Show that sing...
PHYS 3043, Spring 19, HW#1 due Wed, Jan 23, by 3:00 pm 1) Show that sing + a) + sin侄-a)s cos(a) 2) (a) Given two vectors ธิ (2,2,1) and Ce(1,2,-6), what is xc? (b) Are B and C orthogonal to each other? How can you tell? 3) Given vectors A and E a) Define the dot product mathematically in two different ways. One way involving the components and the other the length/angles b)Define the vector cross product mathematically two different...
change pas channels in the volta t ive protein to change shape. This A of the...
change pas channels in the volta t ive protein to change shape. This A of the S l e terminal siste oplasmic reticum calcio p r eneule warcoplasm reticulum sodium ions m o nster transverse tubules sarcolemma: calcium ions Saroplasmic reticum: triadsarcolemma: calcium ions sons bind to This causes a change in shape and exposing C D E Calcium vesicle tylcholine action potential Sodium sarcolemma calcium on myosin heads Sodium sacoplasmic reticulum calcium ions actin 15. An attaches to exposed...
4. (20 pts) Potassium-Argon dating is used in geology and archeology to date sedimentary rocks. Potassium 40 decays by two different paths: 10K → 20Ca + _e (89.3%) 10K → 18 Ar+je (10.7%) The overall half-life of for the decay of potassium-40 is 1.3 x 100 years. Estimate the age of sedimentary rocks with an Argon 40 to Potassium 40 ratio of 0.0102.
Reactivity and Decay
A banana in your lunch contains 380 mg of potassium, of which a small fraction is the radioactive isotope 40 19 K. Using the percentage of radioactive potassium to nonradioactive potassium in Appendix B, estimate the activity of this banana due to the radioactive 40 19 K. decays/s
ReviewI Constants The technique known as potassium-argon dating is used to date volcanic rock and ash, and thus establish dates for nearby fossils like this hominid skull.(Figure 1) The potassium isotope "0K has a 1.28-billion-year half-life and is naturally present at very low levels. Its most common decay mode is beta-minus decay into the stable isotope 40 Ca, but 10.9% of its decays are beta-plus which result in the creation of the stable isotope 40 Ar. The high temperatures in...
The voltaic cell is made of the following two electrodes: 9. Fe (0.200 M) 2e Fe(s) E.d= -0.44 v, Fe(0.100 M) e Fe (0.200 M) Eed0.77 v. Which electrode works as an anode? (20 pt) al Write the cell reaction. b) Calculate E°cell and Ecel. cl 10. A Cr(ag) solution is electrolyzed, using a current of 5.30 A for 2.00 days. What mass of Cr(s) (AM: 52.0) is plated out? (F=96485 C /mol) 11. For nuclear reaction occurred in the...
10. Based on Periodic Table positions, only this set has two elements that would have similar chemical properties: A. 11 Na, 12Mg. sXe, ssCs B. 13A, 14S, SP. As C. 13A, 18K, Ge, Sn. D. SF, Zr, son, sal 11. The IUPAC name of Ba(CIO) is A. Barium chloride B. Barium chlorite C. Barium perchlorate D. Barium chlorate 12. The correct order of increasing effective nuclear charge is AK <Mg <P <NO B. Mg <K<P <NO C.O <N<P < Mg...
PHYS 3043, Spring 19, HW#1 due Wed, Jan 23, by 3:00 pm 1) Show that sing + a) + sin侄-a)s cos(a) 2) (a) Given two vectors ธิ (2,2,1) and Ce(1,2,-6), what is xc? (b) Are B and C orthogonal to each other? How can you tell? 3) Given vectors A and E a) Define the dot product mathematically in two different ways. One way involving the components and the other the length/angles b)Define the vector cross product mathematically two different...
change pas channels in the volta t ive protein to change shape. This A of the S l e terminal siste oplasmic reticum calcio p r eneule warcoplasm reticulum sodium ions m o nster transverse tubules sarcolemma: calcium ions Saroplasmic reticum: triadsarcolemma: calcium ions sons bind to This causes a change in shape and exposing C D E Calcium vesicle tylcholine action potential Sodium sarcolemma calcium on myosin heads Sodium sacoplasmic reticulum calcium ions actin 15. An attaches to exposed...
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