nuclear chemistry review
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Nuclear Chemistry Review. An unstable nucleus ____. a. increases its nuclear mass by fission b.increases its half-life c.emits energy when it decays d.expels all of its protons. Ionizing radiation that consists of helium nuclei is ____. a. Alpha Radiation b. Beta Radiation - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Nuclear Chemistry Review](https://reader036.vdocument.in/reader036/viewer/2022070500/56816865550346895ddec036/html5/thumbnails/1.jpg)
Nuclear ChemistryReview
![Page 2: Nuclear Chemistry Review](https://reader036.vdocument.in/reader036/viewer/2022070500/56816865550346895ddec036/html5/thumbnails/2.jpg)
An unstable nucleus ____.
a. increases its nuclear mass by fissionb. increases its half-lifec. emits energy when it decaysd. expels all of its protons
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Ionizing radiation that consists of helium nuclei is ____.
a. Alpha Radiation
b. Beta Radiation
c. Gamma Radiation
d. Neutron Radiation
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Which type of ionizing radiation can be blocked by clothing?
a. Alpha Radiation
b. Beta Radiation
c. Gamma Radiation
d. Neutron Radiation
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If an isotope decays by the process of beta emission, ____.a. the mass number changesb. the atomic number changesc. protons are given offd. Both a & b
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What particle does argon-39 emit when it decays to potassium-39?
a. neutronb.electronc. protond.alpha particle
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To what element does polonium-208 decay when it emits an alpha particle?
84
208Po 2
4 82
204 Pba. Lead-204
b. Lead-207
c. Radon-212
d. Radon-222
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Controlled nuclear chain reactions ____.a. take place in nuclear reactorsb. are always fusion reactionsc. never produce radioactive by-productsd. are characteristic of atomic bombs
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Nuclear fusion ____.
a. takes place in the sunb. occurs at low temperaturesc. can be controlled in the laboratoryd. does not exist
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A reaction that results in the combining of smaller atomic nuclei is called _______.a. Fissionb. Fusionc. Bombardment by beta particlesd. A chemical reaction
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What does increasing neutron absorption accomplish in a nuclear reactor?a. It speeds up the reactionb. It can make the reactor explodec. It slows down the reaction.d. Trick question, electrons are used in nuclear
reactors, not neutrons.
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Complete the following nuclear reaction:
a. 231, 88b. 239, 94c. 238, 91d. 235, 90
?? 4 23192 2 ??U He Th
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If the half-life of a radioactive material is 8 years, how many years will it take for one half of the original amount of material to decay?a. 4 years
b. 8 years
c. 16 years
d. Need more information
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After 42 days, 2 g of phosphorus-32 has decayed to 0.25 g. What is the half-life of phosphorus-32?
a. 14 days
b. 21 days
c. 32 days
d. 10.5 days
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The radioisotope radon-222 has a half-life of 3.8 days. How much of a 73.9g sample of radon-22 would be left after 22.8 days?
a. 1.1 gb. 3.8 gc. 18 gd. 2.3 g
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If the half-life of sodium-24 is 15 hours, how much remains from a 10.0-g sample after 60.0 hours?
a. 160 g
b. 7.5 g
c. 1.5 g
d. 0.63 g
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a. 14,000 yearsb. 11,460 yearsc. 5,730 yearsd. Need more information
The concentration of carbon-14 in a piece of wood from an ancient burial mound indicates that two half-lives of this radioisotope have passed. If the half-life for carbon-14 is 5730 years, approximately how many years ago did this sample of wood die?
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A sample of sodium-25 has a rate constant of 2.94 yrs-1, how long would it take for a sample to decay from 3.00 g to 2.00 g?
a. 0.225 years
b. 0.225 hours
c. 0.138 years
d. 0.138 hours
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Sulfur-34 has a half life of 13.9 hours. If a 15 g sample is left in a beaker for 24 hours, how much sulfur will remain?a. 7.5 gb. 4.5 gc. 5.6 gd. 3.8 g
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How many neutrons are in an alpha particle?
a. 1
b. 2
c. 3
d. 4
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What is the approximate ratio of neutrons to protons for stable atoms below atomic number 20?
a. 1
b. 2
c. 3
d. 4
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What other particle(s) is involved when Radon-222 produces Polonium-218 and is it through bombardment or decay?
a. 2 neutrons; decay
b. 2 neutrons; bombardment
c. Alpha; decay
d. Alpha; bombardment