Chem1360 Chp11 Self Ass.
Terms in this set (39)
What percentage of background radiation comes from natural sources?
The largest artificial source of background radiation is...
The largest source of natural background radiation is...
What is an electron?
a beta particle
What is an atomic mass of 4u?
an alpha particle
What emission of particles and energy from a nucleus?
What number of protons and neutrons in an atom?
a nucleon number
What are the mass and the charge, respectively, of gamma radiation?
What particle is needed to complete the following nuclear equation? (a super funky equation--trust me it's weird looking w/fractions)
3Qs from Chp 11.4 are too complicated to write...
see pg. 308
A patient is given a 48-mg dose of technetium-99m (half-life 6.0h) to treat a brain cancer. How much of it will remain in his body after 36h?
What is the half-life of a silver-112 if a 10.0g sample decays to 2.5g in 12.4h?
Of a 64.0g sample of strontium 90 (half-life 28.5y) produced by a nuclear explosion, what mass in grams would remain unchanged after 285y?
Lead 210 (half-life 22.26y) can be used to date skeletal remains. About how old is a bone that has an activity of 2.0 Bq if new bone has an activity of 16 Bq?
About how old is a piece of wood from an aboriginal burial site that has a carbon-14 (half0life 5730y) activity of 3.9 counts/min per gram of carbon? Assume that the carbon-14 activity of the wood was 15.6 counts per minute per gram of carbon at the time of the burial.
Iodine- 1 3 1 is sometimes used for detecting leaks in underground pipes because...
it has a short half-life
What is used to irradiate foodstuffs to extend shelf life?
For the next 5 Qs, match each radioisotope with a major use... cobalt-60
What form of radiation is detected in PET scans?
Which of the following pairs represent the MOST and LEAST (most/least) penetrating types of radiation?
Which form of radiation could not readily penetrate a sheet of paper?
A Geiger counter registered 50 Bq of activity from an unknown type of radiation. A piece of paper inserted between the source and the counter caused the reading to drop to about 2 Bq. The radiation was mostly...
Look at the graph is Figure 11.10 to answer questions 1-3. Helium has a particularly high binding energy per nucleon, which means that it...
is more stable compared to H and Li
The most stable nuclei are those of...
Nuclei with nuclear numbers greater than that of iron are...
less stable than iron
Which equation explains why the products of fission have less mass than the original substances?
E = mc^2
Which subatomic particles are responsible for carrying on the chain reactions characteristic of nuclear fission?
When uranium-235 absorbs a neutron and undergoes fission, barium-142 and krypton-91 are two possible fission fragments. How many neutrons are released? (BIG COMPLICATED FRACTION PROBLEM)
What process is represented by the equation 2/1H + 2/1H -- 4/2He + energy?
Hydrogen 2 and hydrogen 3 fuse to form helium 4. The other product is a(n)...
The isotope used in uranium fission reactions is...
What fraction of natural uranium is the fissionable isotope?
Plutonium fir fission reactions is...
made from uranium-238
Strontium-90 substitutes for calcium in bones because Sr and Ca...
are in the same group of the periodic table
Which of the following radioisotopes in fallout is dangerous mainly because it becomes concentrated in the thyroid gland?