Nuclear Chemistry
What is a common problem associated with nuclear power plants?
It is difficult to dispose of wastes.
Large amounts of energy are required in order to join two atom's nuclei into a single nucleus and, in turn, create a new element. What is the name of the process where two nuclei join to create a new element?
Fusion reaction
During beta decay, what happens to the nucleus of the unstable atom?
Gains a proton and loses a neutron.
A radioactive substance has a half-life of 15 years. What fraction of a sample of the substance would be left after 45 years?
1/8
According to the decay curve pictured below, what is the half-life of the cobalt-57 isotope?
10 days
If one-eighth (1/8) of an original sample of Kr-74 remains after 34.5 minutes, what is the half-life of Kr-74?
11.5 minutes
Sciencium-380 has a half-life of 3 days. If you started with a 100 gram sample, how much Sciencium-380 will remain after 9 days?
12.5 g
What is the total number of years that passes before only 3.125 grams of an original 25 gram sample of C-14 remains? C-14 has a half-life of 5,730 years.
17,190 years
A radioactive isotope of potassium (K) has a half-life of 20 minutes. If a 40.0 gram sample of this isotope is allowed to decay for 80 minutes, how many grams of the radioactive isotope will remain?
2.5 grams
If there are 50 grams of U-238 on day zero of radioactive decay, how much will there be after 4.5 billion years? Use the decay curve pictured below to answer the question:
25 grams
A sample of Radon-222 has a half-life of 3.82 days. After 11.46 days, there is 5 grams of Radon-222 remaining. How much Radon-222 was in the original sample?
40 grams
Wagonium-292 has a half-life of 1 hour. If you started with an 80 gram sample, how much Wagonium-292 will remain after 4 hours?
5 g
Plutonium-32 has a half-life of 14.2 days. How many half-lives have passed in 99.4 days?
7 half-lives
What is the half-life of a radioisotope if 50.0 grams of an original 200 gram sample of the isotope remains after 15.60 years?
7.80 years
Looking at the picture below, what decay process occurs in step one?
Alpha decay
Which type of radiation is most likely used in a smoke detector, as it can be stopped by something this small?
Alpha particles
Which of the following types of radioactive decay involves a change in atomic number, but not in mass number?
Beta and Gamma
Looking at the picture below, what decay process occurs in step two?
Beta decay
Radioactive C-14 emits a(n) _______ to become the stable ______ as seen in the equation pictured below: 14/9C --- ___ + 0/-1e
Beta particle; N-14
What is the identity of X in the equation above? 38/19K=X+38/20Ca
Beta particles
Based on the nuclear equation shown in the picture below: X=0/-1e+170/68Er
Ho-170
As the world population continues to rise, the demand for energy also continues to rise. Which type of fuel does little to pollute Earth's atmosphere?
Nuclear
What is one reason nuclear fuel is a positive alternative to fossil fuels for the creation of electrical energy?
Nuclear power produces no carbon dioxide emissions unlike coal or oil power production.
Which of the following is represented by X in the equation give above? 210/84Po=X+4/2He
Pb206
Which isotope listed in the choices below is most likely to be radioactive?
Pu-241
Based on the nuclear equation shown in the picture below: 91/43Tc = 0/-1e+X
Ru-91
Where do nuclear fusion reactions occur naturally?
Sun and stars
In the isotopic notation given in the picture below, using your Periodic Table identify X. 209/84X
X = Po