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Topic 12: Nuclear Chemistry

24. Half-Life: Interpreting half-life graphs
1. The graph below represents the decay of a radioisotope.

What is the half-life of this radioisotope?
1) 8 years 2) 45 years 3) 30 years 4) 60 years

2. The graph below represents the decay of a radioactive material X into a stable decay product.
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What is the approximate half-life of radioactive material X?
1) 5,000 years 2) 50,000 years 3) 10,000 years 4) 1000,000 years

3. The graph below represents the decay of a radioisotope.

According to Reference Table N, the decay of which radioisotope is represented by the graph?
198
42
42
1) k 2) P 3) 131 I 4) Au

4. The graph below represents the decay of a radioactive material X into a stable decay product?

Which graph best represents the relative percentages of the radioactive material X and its stable
product after 15,000 years? (shaded area represents radioactive material while the non-shaded
area represents stable products)

1) 2) 3) 4)
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