Worksheetshalf life review
Total questions: 10
Worksheet time: 25mins
Name
Class
Date
1.
The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 7.2 minutes has elapsed?
a)
100.0g
b)
50.0g
c)
12.5g
d)
8.5g
2.
Fermium-253 has a half-life of 0.334 seconds. A radioactive sample is considered to be completely decayed after 10 half-lives. How much time will elapse for this sample to be considered gone?
a)
0.334 seconds
b)
3.34 seconds
c)
1.77 seconds
d)
13.4 seconds
3.
If the half-life of uranium-232 is 70 years, how many half-lives will it take for 10 g of it to be reduced to 1.25 g?
a)
1 half-life
b)
2 half-lives
c)
3 half-lives
d)
4 half-lives
4.
What is the half-life of iodine-131?
a)
32 days
b)
8 days
c)
16 days
d)
24 days
5.
The % of the parent isotope remaining after 1 Half Life.
a)
50%
b)
25%
c)
12.5%
d)
6.25%
6.
What is the Half Life of this isotope?
a)
3 days
b)
5 days
c)
8 days
d)
10 days
7.
After 22,800 years, approximately what percentage of the original carbon-14 remains?
a)
15%
b)
12.5%
c)
6.25%
d)
3.125%
8.
What is the Half life of this isotope?
a)
5 seconds
b)
10 seconds
c)
15 seconds
d)
20 seconds
9.
The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 7.2 minutes has elapsed?
a)
100.0g
b)
50.0g
c)
12.5g
d)
8.5g
e)
25 g
10.
What is an isotope?
a)
one of several forms of the same atoms; same number of protons but have different number of neutrons
b)
a particle that has no charge and is located in the nucleus of an atom.
c)
energy in the form of waves or particles that is emitted from an object and travels through space or air
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