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WorksheetsChapter 5 -Radioactive
Total questions: 20
Worksheet time: 3hrs 46mins
In the equation, 146C --> 147N + 0-1B, the _______ decay of radioactive carbon-14 results in the creation of a new nitrogen-14 atom.
Gamma
Beta
Alpha
An isotope of phosphorus has a half-life of 15 days. A sample contains 20 g of this isotope at present. How many grams of this isotopes were there in this sample 60 days ago?
60 g
80 g
160 g
320 g
How long will it take for a 28-gram sample of radon-222 to decay to 3.5 grams? the half-life of radon-222 of 3.82 days
15.28 days
11.46 days
3 days
4 days
How long does it take a 180-gram of gold-198 to decay to 22.5 grams if the half -life of gold-198 is 2.68 days?
8.04 days
3 days
4 days
2.68 days
How long will it for a take for a 40 gram. The half-life of cobalt-60 is 5.26 years sample ofcobalt-60 to decay to 5 grams?
17.75 days
15.78 years
15.15 years
17.17 years
24094Pu —› ____ + 42He
23692U
24796Cm
24493Np
24295Am
Gamma rays have
no mass
a huge mass
a small mass
an average mass
The half-life of Zn-71 is 2.4 minutes. Starting with 100.0 g, how many grams would remain after 7.2 minutes?
100.0 g
50.0 g
12.5 g
8.5 g
The half-life of strontium-90 is 25 years. How much will remain after 100 years if the initial amount is 4.0 g?
3.0 g
0.25 mg
0.3 g
6.25 g
What two subatomic particles are found in an atom's nucleus?
Protons and neutrons
neutrons and electrons
electrons and protons
What is likely to happen to unstable nuclei with too many, or too few, neutrons?
They will decay by emitting radiation.
They will loose all their electrons.
They will bond with other atoms.
What could an unstable nucleus emit?
Alpha, gamma, beta, and sometimes a neutron.
Alpha, beta, gamma, and sometimes delta
Alpha, beta, delta, and sometimes gamma
If the nucleus has too few neutrons, it will emit two protons and two neutrons called ___________.
an alpha particle
a beta particle
a neutron
gamma radiation
Beta radiation is ____________________
an electron from an electron shell.
an electron from the nucleus.
two protons and two neutrons.
a high frequency electromagnetic wave.
What is X?
alpha particle
Beta particle
Gamma Ray
neutron
