There are two major isotopes of uranium, 235 U (half-life 7.038 × 10 9 yr, 0.720%) and 238 U (half-life 4.468 × 10 10 yr, 99.274%). What was the relative abundance of 234 U two billion years (2.0 × 10 9 years) ago?
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Chemistry & Chemical Reactivity
10th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781337399074
BuyFindlaunch
Chemistry & Chemical Reactivity
10th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781337399074
Chapter 25.8, Problem 1.1ACP
Textbook Problem
There are two major isotopes of uranium, 235U (half-life 7.038 × 109 yr, 0.720%) and 238U (half-life 4.468 × 1010 yr, 99.274%). What was the relative abundance of 234U two billion years (2.0 × 109 years) ago?
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Chemistry & Chemical Reactivity
Ch. 25.2 - (a) Six and four particles are emitted in the...Ch. 25.2 - Indicate the symbol, the mass number, and the...Ch. 25.3 - Write an equation for the probable mode of decay...Ch. 25.3 - Calculate the binding energy per nucleon, in...Ch. 25.4 - Tritium (13H), a radioactive isotope of hydrogen,...Ch. 25.4 - (a) A sample of Ca3(PO4)2 containing phosphorus-32...Ch. 25.4 - A sample of the inner part of a redwood tree...Ch. 25.5 - Technetium is one of the two elements with atomic...Ch. 25.8 - To measure the solubility for PbCrO4 you mix a...Ch. 25.8 - There are two major isotopes of uranium, 235U...Ch. 25.8 - Rates of decomposition can be measured based on...Ch. 25.8 - Uranium-235 is an alpha emitter. 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Write...Ch. 25 - Complete the following nuclear equations. Write...Ch. 25 - Complete the following nuclear equations. Write...Ch. 25 - Complete the following nuclear equations. Write...Ch. 25 - The uranium-235 radioactive decay series,...Ch. 25 - The thorium-232 radioactive decay series,...Ch. 25 - What particle is emitted in the following nuclear...Ch. 25 - What is the product of the following nuclear decay...Ch. 25 - Predict the probable mode of decay for each of the...Ch. 25 - Predict the probable mode of decay for each of the...Ch. 25 - (a) Which of the following nuclei decay by decay?...Ch. 25 - (a) Which of the following nuclei decay by 10...Ch. 25 - Boron has two stable isotopes, 10B and 11B....Ch. 25 - Calculate the binding energy in kilojoules per...Ch. 25 - Calculate the binding energy per mole of nucleons...Ch. 25 - Calculate the binding energy per mole of nucleons...Ch. 25 - Calculate the binding energy per mole of nucleons...Ch. 25 - Calculate the binding energy per mole of nucleons...Ch. 25 - Copper(II) acetate containing 64Cu is used to...Ch. 25 - Gold-198 is used in the diagnosis of liver...Ch. 25 - Iodine-131 is used to treat thyroid cancer. (a)...Ch. 25 - Phosphorus-32 is used in the form of Na2HPO4 in...Ch. 25 - Gallium-67 (t = 78.25 hours) is used in the...Ch. 25 - Iodine-131 (t = 8.04 days), a emitter, is used to...Ch. 25 - Radon has been the focus of much attention...Ch. 25 - Strontium-90 is a hazardous radioactive isotope...Ch. 25 - Radioactive cobalt-60 is used extensively in...Ch. 25 - Scandium occurs in nature as a single isotope,...Ch. 25 - Americium-240 is made by bombarding plutonium-239...Ch. 25 - There are two isotopes of americium, both with...Ch. 25 - The superheavy element 287FI (element 114) was...Ch. 25 - To synthesize the heavier transuranium elements, a...Ch. 25 - Deuterium nuclei (H12) are particularly effective...Ch. 25 - Some important discoveries in scientific history...Ch. 25 - Boron is an effective absorber of neutrons. When...Ch. 25 - Some of the reactions explored by Ernest...Ch. 25 - A technique to date geological samples uses...Ch. 25 - Tritium, H13, is one of the nuclei used in fusion...Ch. 25 - Phosphorus occurs in nature as a single isotope,...Ch. 25 - In June 1972, natural fission reactors, which...Ch. 25 - If a shortage in worldwide supplies of fissionable...Ch. 25 - When a neutron is captured by an atomic nucleus,...Ch. 25 - The synthesis of livermorium: (a) Lv-296 is made...Ch. 25 - Some important discoveries in scientific history...Ch. 25 - A piece of charred bone found in the ruins of a...Ch. 25 - A sample of wood from a Thracian chariot found in...Ch. 25 - The isotope of polonium that was most likely...Ch. 25 - Sodium-23 (in a sample of NaCI) is subjected to...Ch. 25 - The age of minerals can sometimes be determined by...Ch. 25 - To measure the volume of the blood system of an...Ch. 25 - The average energy output of a good grade of coal...Ch. 25 - Collision of an electron and a positron results in...Ch. 25 - The principle underlying the isotope dilution...Ch. 25 - Radioactive isotopes are often used as "tracers'...Ch. 25 - The thorium decay series includes the...Ch. 25 - The last unknown element between bismuth and...Ch. 25 - You might wonder how it is possible to determine...Ch. 25 - Marie and Pierre Curie isolated radium and...
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