1. Complete the following table (Use a periodic table to help you and if you do not have a periodic
table, see your teacher.). Assume the atoms are neutrally charged. (10 marks)
2. State the unknown values in each of these equations (Use the following table for assistance).
(10 marks)
3. A sample of radioactive polonium-214 produces alpha particles at a rate of 150 MBq. What
will be the rate of production of alpha particles in 3.69 X 10-4 s? (3 marks)
4. A 30.2 g sample of magnesium-29 has a half of 9.5 minutes. How much magnesium is left in
47.5 minutes? (3 marks)
5. The radioactivity of a sample has decreased to one thirty second of its original value in
2.048 X 103 s.
a) What is the half life of the element? (2 marks)
b) If the final mass was 18 g, what was the starting mass? (2 marks)
6. A sample of a living tree produces radioactivity of 0.45 Bq when tested for carbon-14. A tree
of the same species found in a lava flow has a reading of 0.080 Bq. How long ago did the
volcano erupt? (2 marks)
7. Write equations for each of these nuclear reaction. (2 marks each)
a) Calcium is bombarded with alpha particles to produce a nuclear reaction.
b) 59Co27 is bombarded with neutrons.
c) 63Co27 emits an alpha particle.
d) A neutron strikes a 239U92 atom which splits into a 207Pb82 atom. Also released are
eight neutrons and one beta particle.
e) A beryllium atom collides with a lithium atom. This results in the fusing of the two
atoms and the release of a beta particle and a neutron.
8. A nuclear reaction produces 4.8 X 1014 J of energy. How much mass was converted to
energy? (3 marks)
9. In a nuclear reaction, 4.7 X 10-5 kg of mass disappears. How much energy was produced?
(3 marks)
10. An object receives a dosage of 50.2 Gy. How many Joules of energy has the object
absorbed if its mass is 30.0 kg. (3 marks)
January 20, 2014