Chemistry by OpenStax (2015-05-04)
1st Edition
ISBN: 9781938168390
Author: Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Publisher: OpenStax
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Chapter 12, Problem 38E
What is the half-life for the first-order decay of carbon-14?
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Chapter 12 Solutions
Chemistry by OpenStax (2015-05-04)
Ch. 12 - What is the difference between average rate,...Ch. 12 - Ozone decomposes to oxygen according to the...Ch. 12 - In the nuclear industry, chlorine trifluoride is...Ch. 12 - A study of the rate of dimerization of C4H6 gave...Ch. 12 - A study of the rate of the reaction represented as...Ch. 12 - Consider the following reaction in aqueous...Ch. 12 - Describe the effect of each of the following on...Ch. 12 - Explain why an egg cooks move slowly in boiling...Ch. 12 - Go to the PhET Reactions and change to Angled...Ch. 12 - In the PhET Reactions tab to observe how multiple...
Ch. 12 - In the PhET Reactions under Options. (a) Leave...Ch. 12 - How do the rate of a reaction and its rate...Ch. 12 - Doubling the concentration of a reactant increases...Ch. 12 - Tripling the concentration of a reactant increases...Ch. 12 - How much and in what direction will each of the...Ch. 12 - How will each of the following affect the rate of...Ch. 12 - Regular ?ights of supersonic aircraft in the...Ch. 12 - Radioactive phosphorus is used in the study of...Ch. 12 - The rate constant for the radioactive decay of 14C...Ch. 12 - The decomposition of acetaldehyde is a second...Ch. 12 - Alcohol is removed from the bloodstream by a...Ch. 12 - Under certain conditions the decomposition of...Ch. 12 - Nitrosyl chloride, NOCI, decomposes to NO and CI2....Ch. 12 - From the following data, determine the rate...Ch. 12 - Nitrogen monoxide reacts with chlorine according...Ch. 12 - Hydrogen reacts with nitrogen monoxide to form...Ch. 12 - For the reaction AB+C, the following data were...Ch. 12 - For the reaction QW+X, the following data were...Ch. 12 - The rate constant for the ?rst-order decomposition...Ch. 12 - The annual production of HNO3 in 2013 was 60...Ch. 12 - The following data have been determined for the...Ch. 12 - Describe how graphical methods can be used to...Ch. 12 - Use the data provided to graphically determine the...Ch. 12 - Use the data provided in a graphical method to...Ch. 12 - Pure ozone decomposes slowly to oxygen, 2O33O2(g)....Ch. 12 - From the given data, use a graphical method to...Ch. 12 - What is the half-life for the first-order decay of...Ch. 12 - What is the half-life for the first-order decay of...Ch. 12 - What is the half-life for the decomposition of...Ch. 12 - What is the half-life for the decomposition of O3...Ch. 12 - The reaction of compound A to give compounds C and...Ch. 12 - The half-life of a reaction of compound A to give...Ch. 12 - Some bacteria are resistant to the antibiotic...Ch. 12 - Both technetium-99 and thallium-201 are used to...Ch. 12 - There are two molecules with the formula C3H6...Ch. 12 - Fluorine-18 is a radioactive isotope that decays...Ch. 12 - Suppose that the half-life of steroids taken by an...Ch. 12 - Recently, the skeleton of King Richard III was...Ch. 12 - Nitroglycerine is an extremely sensitive...Ch. 12 - For the past 10 years, the unsaturated hydrocarbon...Ch. 12 - Chemical reactions occur when reactants collide....Ch. 12 - When every collision between reactants leads to a...Ch. 12 - What is the activation energy of a reaction, and...Ch. 12 - Account for the relationship between the rate of a...Ch. 12 - Describe how graphical methods can be used to...Ch. 12 - How does an increase in temperature affect rate of...Ch. 12 - The rate of a certain reaction doubles for every...Ch. 12 - In an experiment, a sample of NaClO3 was 90%...Ch. 12 - The rate constant at 325 C for the decomposition...Ch. 12 - The rate constant for the decomposition of...Ch. 12 - An elevated level of the enzyme alkaline...Ch. 12 - In terms of collision theory, to which of the...Ch. 12 - Hydrogen iodide, HI, decomposes in the gas phase...Ch. 12 - The element Co exists in two oxidation states,...Ch. 12 - The hydrolysis of the sugar sucrose to the sugars...Ch. 12 - Use the PhET Reactions Single collision" tab of...Ch. 12 - Use the PhET Reactions Single collision tab of the...Ch. 12 - Why awe elementary reactions involving three or...Ch. 12 - In general, can we predict the effect of doubling...Ch. 12 - Define these terms: (a) unimolecular reaction (b)...Ch. 12 - What is the rate equation for the elementary...Ch. 12 - Given the following reactions and the...Ch. 12 - Write the rate equation for each of the following...Ch. 12 - Nitrogen (Il) oxide, NO, reacts with hydrogen, H2,...Ch. 12 - Experiments were conducted to study the rate of...Ch. 12 - The reaction of CO with CI2 gives phosgene...Ch. 12 - . Account for the increase in reaction rate...Ch. 12 - Compare the functions of homogeneous and...Ch. 12 - Consider this scenario and answer the following...Ch. 12 - For each of the following pairs of reaction...Ch. 12 - For each of the following pairs of reaction...Ch. 12 - For each of the following reaction diagrams,...Ch. 12 - For each of the following reaction diagrams,...Ch. 12 - Based on the diagrams in Exercise 12.83, which of...Ch. 12 - Based on the diagram in Exercise 12.83, which of...
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- Iodine-131 is used to treat tumors in the thyroid. Its decomposition is first-order with a half-life of 8.1 days. If a patient is given a sample containing 5.00 mg of I-131, how long will it take for 32% of the isotope to remain in her system?arrow_forwardWhen formic acid is heated, it decomposes to hydrogen and carbon dioxide in a first-order decay. HCOOH(g) CO2(g) + H2(g) At 550 C, the half-life of formic acid is 24.5 minutes. (a) What is the rate constant, and what are its units? (b) How many seconds are needed for formic acid, initially 0.15 M, to decrease to 0.015 M?arrow_forwardWhen formic acid is heated, it decomposes to hydrogen and carbon dioxide in a first-order decay: HCOOH(g)CO2(g)+H2(g) The rate of reaction is monitored by measuring the total pressure in the reaction container. Time (s) Pressure (torr) 0 220 50 324 100 379 150 408 200 423 250 431 300 435 Calculate the rate constant and half-life in seconds for the reaction. At the start of the reaction (time = 0), only formic acid is present. (HINT: Find the partial pressure of formic acid using Dalton's law of partial pressure and the reaction stoichiometry to find PHCOOH at each time.)arrow_forward
- Sucrose, a sugar, decomposes in acid solution to give glucose and fructose. The reaction is first-order in sucrose, and the rate constant at 25 C is k = 0.21 h1. If the initial concentration of sucrose is 0.010 mol/L, what is its concentration after 5.0 h?arrow_forwardExplain why half-lives are not normally used to describe reactions other than first order.arrow_forwardBoth technetium-99 and thallium-201 are used to image heart muscle in patients with suspected heart problems. The half-lives are 6 h and 73 h, respectively. What percent of the radioactivity would remain for each of the isotopes after 2 days (48 h)?arrow_forward
- At 573 K, gaseous NO2(g) decomposes, forming NO(g) and O2(g). If a vessel containing NO2(g) has an initial concentration of 1.9 102 mol/L, how long will it take for 75% of the NO2(g) to decompose? The decomposition of NO2(g) is second-order in the reactant and the rate constant for this reaction, at 573 K, is 1.1 L/mol s.arrow_forwardLabel the elementary processes for the reaction between H2 and O2 see section 20.7 as initiation, propagation, branching, or termination reactions.arrow_forwardWhen enzymes are present at very low concentration, their effect on reaction rate can be described by first-order kinetics. Calculate by what factor the rate of an enzyme-catalyzed reaction changes when the enzyme concentration is changed from 1.5 107 M to 4.5 106 M.arrow_forward
- Radioactive gold-198 is used in the diagnosis of liver problems. 198Au decays in a first-order process, emitting a particle (electron). The half-life of this isotope is 2.7 days. You begin with a 5.6-mg sample of the isotope. Calculate how much gold-198 remains after 1.0 day.arrow_forwardWhat will the units of the rate constants in Question 12 be if the rate is expressed in mol/L min?arrow_forwardThe initial rate ( [NO]/ t] of the reaction of nitrogen monoxide and oxygen NO(g) + 2O2(g) NO2(g) was measured for various initial concentrations of NO and O2 at 25 C. Determine the rate equation from these data. What is the value of the rate constant, k, and what are its units?arrow_forward
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