16. The chemical reaction for photosynthesis is 6 CO2 + 12 H20 + light energy C6H1206 + 6 02 + 6 H20 If the input water is labeled with a radioactive isotope of oxygen, 180, then the oxygen gas released as the reaction proceeds is also labeled with 180. Which of the following is the most likely explanation? (A) During the light reactions of photosynthesis, water is split, the hydrogen atoms combine with the CO2, and oxygen gas is released. (B) During the light reactions of photosynthesis, water is split, removing electrons and protons, and oxygen gas is released. (C) During the Calvin cycle, water is split, regenerating NADPH from NADP+, and oxygen gas is released. (D) During the Calvin cycle, water is split, the hydrogen atoms are added to intermediates of sugar synthesis, and oxygen gas is released.

16. The chemical reaction for photosynthesis is 6 CO2 + 12 H20 + light energy C6H1206 + 6 02 + 6 H20 If the input water is labeled with a radioactive isotope of oxygen, 180, then the oxygen gas released as the reaction proceeds is also labeled with 180. Which of the following is the most likely explanation? (A) During the light reactions of photosynthesis, water is split, the hydrogen atoms combine with the CO2, and oxygen gas is released. (B) During the light reactions of photosynthesis, water is split, removing electrons and protons, and oxygen gas is released. (C) During the Calvin cycle, water is split, regenerating NADPH from NADP+, and oxygen gas is released. (D) During the Calvin cycle, water is split, the hydrogen atoms are added to intermediates of sugar synthesis, and oxygen gas is released.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Similar questions

If exactly 1.00 μg of 226Ra was used to paint the glow-in-the-dark dial of a wristwatch made in 1914, how radioactive is the watch in 2011? Express your answer in becquerels (Bq). The half-life of 226Ra is 1.60 ×× 103 years.
4.
14. Using a mass spectrometer, a sample of an ancient wooden object was found to have a ratio of 14C to 12C equal to 3.3×10 −13 as compared to a current biological sample, which has a ratio of 14C to ¹2C of 1.2×10 −12 (Given: t, is 5730 years) What is the age of the object? 15. For the reaction, 2 A(g) + B₂(g) → 2 AB(g) The rate law is; rate = k[A][B₂]³ At 22.0 °C, k = 1234 M-³s-¹. What would be the rate of the reaction if the concentration of A is 0.100 M and concentration of B₂ is 0.125 M.
Some Radioactive Isotopes Useful in Medical Imaging Mode of Decay Isotope Half-life Use in Medical Imaging B+, y B+, y Carbon-11 Fluorine-18 Phosphorus-32 Chromium-51 Brain scan to trace glucose metabolism Brain scan to trace glucose metabolism Detect eye tumors Diagnose albinism, image the spleen and gastrointestinal tract 20.3 m EF 109 m 14.3 d 27.7 d 44.5 d Cr Fe SiGa E.C., Y В, у E.C., Y E.C., Y Iron-59 Bone marrow function, diagmose anemias 78.3 h 118 d Whole-body : scan for tumors Pancreas scan Lung ventilation scan Scan for bone diseases, including cancer Brain, liver, kidney, bone scans; diagnosis of damaged heart muscle Diagnosis of thyroid malfunction Kidney scan Heart scan and exercise stress test 118 d 13.3 s Strontium-81 22.2 m Technetium-99m 6.01 h 8.04 d Iodine-131 B, y 1Hg 201TI Mercury-197 Thallium-201 E.C., Y 64.1 h E.C., y 3.05 d The radioactive isotope strontium-81 is used in medical imaging as indicated on the table above. If 51.l milligrams of strontium-81 is…
Dinitrogen trioxide, N2O3, is largely dissociated into NO and NO2 in the gas phase where there exists the equilibrium, N2O3 = NO + NO2 In an effort to determine the structure of N2O3, a mixture of NO and "NO2 was prepared containing isotopically labeled N in the NO2. After a period of time the mixture was analyzed and found to contain substantial amounts of both *NO and *NO2. Explain how this is consistent with the structure of N2O3 being ÔNONO. Because this is an equilibrium process, there is a change that either the forward or the reverse reactions will occur. As NO reacts with NO2 we form This compound can decompose and give either NO2 and and "NO2. or After sufficient time, v will be present in the mixture. both "NO and NO Attempts: 0 of 3 used Submit Answer Save for Later only *NO only NO
21
Write a nuclear equation for the type of decay each of these unstable isotopes is most likely to undergo. (Enter your answer in the form X. Use He for alpha decay, B for beta decay, and 8 for positron emission. Ignore gamma photons, neutrinos, and antineutrinos.) (a) Na (b) Li (c) ° Rn (d) Mg +
Provide the practical uses of the following: 1) Carbon 14 2) Uranium - 238 3) Iodine - 131 4) Cobalt - 60
In a leather sandal a mass spectrometer measures the Carbon 14 content of 8.3 E-11 % of all of the carbon isotope present. The approximate age of the sandal is? Given that the half life of Carbon 14 is 5730 years and of all of carbon isopotes present in living tissue, 1.66 E-10% are Carbon 14
You’re wandering around and come upon an interesting looking rock. The rock is slightly radioactive, so you analyze it. The resulting data is as follows:Elapsed Time(s) / Counts0 / 96250 / 891100 / 718150 / 598200 / 531250 / 448300 / 413350 / 334400 / 308450 / 287500 / 202550 / 178600 / 154 a. Calculate the value of k using any two of the above data points.b. Use your value of k to determine the half-life of this sample.
A solution of selenium-75, a radioisotope used in the diagnosis of pancreatic disease, is found just prior to administration to have an activity of 44 μCi/mL. If 3.89 mL were delivered intravenously to the patient, what dose of Se-75 (in μCi) did the patient receive? Express your answer using two significant figures.
L Sn(s) + Pb²+(aq) V, [Pb²+] = 3.00 M) - Sn²-(aq) + Pb(s) บ SO₂ + Cl2₂ S + HCIO₂ ->> = 0.011 When the following equation is balanced, how many water molecules are present in the reactants? If f there are no water molecules, use the number 0. One of the radioactive isotopes used in medical treatment or analysis is chromium-51. The half-life of chromium-51 is 28 days. How many days is/are >