Chemistry Atoms First2e
2nd Edition
ISBN: 9781947172647
Author: OpenStax
Publisher: OpenStax College
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Textbook Question
Chapter 20, Problem 37E
Technetium-99 is often used for assessing heart, liver, and lung damage because certain technetium compounds are absorbed by damaged tissues. It has a half-life of 6.0 h. Calculate the rate constant for the decay of
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NMR spectrum of ethyl acetate has signals whose chemical shifts are indicated below. Which hydrogen or set of hydrogens corresponds to the signal at
4.1 ppm? Select the single best answer.
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ethyl acetate
H NMR: 1.3 ppm, 2.0 ppm, 4.1 ppm
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How many signals do you expect in the H NMR spectrum for this molecule?
Br Br
Write the answer below.
Also, in each of the drawing areas below is a copy of the molecule, with Hs shown. In each copy, one of the H atoms is colored red. Highlight in red all other H
atoms that would contribute to the same signal as the H already highlighted red
Note for advanced students: In this question, any multiplet is counted as one signal.
1
Number of signals in the 'H NMR spectrum.
For the molecule in the top drawing area, highlight in red any other H atoms that will contribute to
the same signal as the H atom already highlighted red.
If no other H atoms will contribute, check the box at right.
Check
For the molecule in the bottom drawing area, highlight in red any other H atoms that will contribute
to the same signal as the H atom already highlighted red.
If no other H atoms will contribute, check the box at right.
O
✓
No additional Hs to color in top
molecule
ง
No additional Hs to color in bottom…
in the kinetics experiment, what were the values calculated? Select all that apply.a) equilibrium constantb) pHc) order of reactiond) rate contstant
Chapter 20 Solutions
Chemistry Atoms First2e
Ch. 20 - Write the following isotopes in hyphenated form...Ch. 20 - Write the following isotopes in nuclide notation...Ch. 20 - For the following isotopes that have missing...Ch. 20 - For each of the isotopes in Exercise 20.1,...Ch. 20 - Write the nuclide notation, including charge if...Ch. 20 - Calculate the density of the M1224g nucleus in...Ch. 20 - What are the two principal differences between...Ch. 20 - The mass of the atom N1123a is 22.9893 arm.. (a)...Ch. 20 - Which of the following nuclei lie within the band...Ch. 20 - Which of the following nuclei lie within the band...
Ch. 20 - Write a brief description or definition of each of...Ch. 20 - Which of the various particles ( particles, ...Ch. 20 - Complete each of the following equations by adding...Ch. 20 - Complete each 0f the following equations: (a)...Ch. 20 - Write a balanced equation for each of the...Ch. 20 - Technetium-99 is prepared from 98Mo. Molybdenum-SS...Ch. 20 - The mass of the atom F919 is 18.99840 amu.. (a)...Ch. 20 - For the reaction C614N714+?, if 100.0 g of carbon...Ch. 20 - What are the types of radiation emitted by the...Ch. 20 - That changes occur to the atomic number and mass...Ch. 20 - What is the change in the nucleus that results...Ch. 20 - Many nuclides with atomic numbers greater than 83...Ch. 20 - Why is electron capture accompanied by the...Ch. 20 - Explain, in terms of Figure 20.2, how unstable...Ch. 20 - Which of the following nuclei is most likely to...Ch. 20 - The following nuclei do not lie in the band of...Ch. 20 - The following nuclei do not lie in the band of...Ch. 20 - Predict by what mode(s) of spontaneous radioactive...Ch. 20 - Write a nuclear reaction for each step in the...Ch. 20 - Write a nuclear reaction for each step in the...Ch. 20 - Define the term half-life and illustrate it with...Ch. 20 - A 1.00106 -g sample of nobelium, N102254o, has a...Ch. 20 - 239Pu is a nuclear waste byproduct with a...Ch. 20 - The isotope 208Tl undergoes decay with a...Ch. 20 - If 1.000 g of R88226a produces 0.0001 mL of the...Ch. 20 - The isotope S3890r one of the extremely hazardous...Ch. 20 - Technetium-99 is often used for assessing heart,...Ch. 20 - What is the age of mummified primate skin that...Ch. 20 - A sample of rock was found to contain 8.23 mg of...Ch. 20 - A laboratory investigation shows that a sample of...Ch. 20 - Plutonium was detected in trace amounts in natural...Ch. 20 - A B47e atom (mass = 7.0169 amu) decays into a L37i...Ch. 20 - A B58 atom (mass = 8.0246 amu) decays into B48...Ch. 20 - Isotopes such as 26Al (half-life: 7.2105 years)...Ch. 20 - Write a balanced equation for each of the...Ch. 20 - Write a balanced equation for each of the...Ch. 20 - Write the balanced nuclear equation for the...Ch. 20 - How does nuclear fission differ from nuclear...Ch. 20 - Both fusion and fission are nuclear reactions. Why...Ch. 20 - Cite the conditions necessary for a nuclear chain...Ch. 20 - Describe the components of a nuclear reactor.Ch. 20 - In usual practice, both a moderator and control...Ch. 20 - Describe how the potential energy of uranium is...Ch. 20 - The mass of a hydrogen atom (11H) is 1.007825 arm;...Ch. 20 - How can a radioactive nuclide be used to show that...Ch. 20 - Technetium-99m has a half-life of 6.01 hours. If a...Ch. 20 - Iodine that enters the body is stored in the...Ch. 20 - If a hospital were storing radioisotopes, what is...Ch. 20 - Based on what is known about Radon-222’s primary...Ch. 20 - Given specimens uranium-232 (t1/2=68.9y) and...Ch. 20 - A scientist is studying a 2.234 g sample of...Ch. 20 - Given specimens neon-24 (t1/2=3.38min) and...
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Similar questions
- true or false, given that a 20.00 mL sample of NaOH took 24.15 mL of 0.141 M HCI to reach the endpoint in a titration, the concentration of the NaOH is 1.17 M.arrow_forwardin the bromothymol blue experiment, pKa was measured. A closely related compound has a Ka of 2.10 x 10-5. What is the pKa?a) 7.1b) 4.7c) 2.0arrow_forwardcalculate the equilibrium concentration of H2 given that K= 0.017 at a constant temperature for this reaction. The inital concentration of HBr is 0.050 M.2HBr(g) ↔ H2(g) + Br2(g)a) 4.48 x 10-2 M b) 5.17 x 10-3 Mc) 1.03 x 10-2 Md) 1.70 x 10-2 Marrow_forward
- true or falsegiven these two equilibria with their equilibrium constants:H2(g) + CI2(l) ↔ 2HCI(g) K= 0.006 CI2(l) ↔ CI2(g) K= 0.30The equilibrium contstant for the following reaction is 1.8H2(g) + CI2 ↔ 2HCI(g)arrow_forwardI2(g) + CI2(g) ↔ 2ICIK for this reaction is 81.9. Find the equilibrium concentration of I2 if the inital concentration of I2 and CI2 are 0.010 Marrow_forwardtrue or false,the equilibrium constant for this reaction is 0.50.PCI5(g) ↔ PCI3(g) + CI2(g)Based on the above, the equilibrium constant for the following reaction is 0.25.2PCI5(g) ↔. 2PCI3(g) + 2CI2(g)arrow_forward
- true or false, using the following equilibrium, if carbon dioxide is added the equilibrium will shift toward the productsC(s) + CO2(g) ↔ 2CO(g)arrow_forward2S2O2/3- (aq) + I2 (aq) ---> S4O2/6- (aq) +2I- (aq) Experiment I2 (M) S2O3- (M) Initital Rate (M/s) 1 0.01 0.01 0.0004 2 0.01 0.02 0.0004 3 0.02 0.01 0.0008 Calculate the overall order for this reaction using the table data a) 3b) 0c) 2d) 1arrow_forwardthe decomposition of N2O5 is the first order with a half-life of 1.98 minutes. If the inital concentration of N2O5 is 0.200 M, what is the concentration after 6 minutes?a) 0.612 Mb) 0.035 Mc) 0.024 Md) 0.100 Marrow_forward
- 20.00 mL of 0.150 M HCI is titrated with 0.075 M NaOH. What volume of NaOH is needed?a) 50 mLb) 20 mLc) 40 mLd) 26.66 mLarrow_forward20.00 mL of 0.150 M NaOH is titrated with 37.75 mL of HCI. What is the molarity of the HCI?a) 0.150 Mb) 0.079 Mc) 0.025 Md) 0.050 Marrow_forwardin the following reaction, the OH- acts as which of these?NO2- (aq) + H2O (l) ⇌ OH- (aq) + HNO2 (aq)a) not a weak acidb) basec) acidarrow_forward
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