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Students should complete the Analysis section of the lab sheet, which will be used as part of their assessment.Advise students to read through the simulation first so that they understand what they should do.Before the lesson, you will have to weigh out about 80 candies for each group of students.If you count ten and weigh them, then multiply by 8, you will know how many grams of candy to weigh out for each group.To do this lesson and understand half-life and rates of radioactive decay, students should understand ratios and the multiplication of fractions, and be somewhat comfortable with probability.Games with manipulative or computer simulations should help them in getting the idea of how a constant proportional rate of decay is consistent with declining measures that only gradually approach zero.Include your ideas about how its half-life of 28.8 years would be important.
In addition to using answers to students' analysis questions and their graphs for assessment, consider having them respond to the following in their science journals or as a homework assignment: Strontium is chemically similar to calcium.
Have students look at the Glossary of Nuclear Science Terms for alpha and beta decay.
Ask students to explain the terms in their own words.
You may group them in any size, but working in pairs is optimal for this exercise.
Weigh out 80 candies for each group into cups before students arrive, as described in the Planning Ahead section above.