Physical Science 8th grade (1).pdf

Why do you think this is so 3 use the internet or a

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Why do you think this is so? 3. Use the Internet or a library to find out more about bioluminescent sea creatures. Here are some questions to pursue: What is the most common color of light produced? What other colors of bioluminescence have been found? Chapter 6 Connection
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134 Atoms and Radioactivity Radioactivity is how we describe any process where the nucleus of an atom emits particles or energy. All radioactive elements have a half-life. This means that there is a certain length of time after which half of the radioactive element has decayed. Radioactive elements have an unstable nucleus, which decays into an different type of atom with a more stable nucleus. As it decays, it releases radiation. Materials: can of pennies, graph paper What you will do Your teacher has given you a can of pennies to represent the atoms of a sample of a newly discovered, radioactive element. You will use the pennies to simulate the process of radioactive decay. Upon completion of the simulation, you will construct a graph of your data. Shake your can of pennies and spill them out onto a tray or table. 1. Remove all pennies that are “heads” up and count them. 2. Record these as decayed atoms in a table like the one below. 3. Put the rest of the pennies back into the can and shake them again. 4. Spill them out onto the tray or table, and again, remove and count the “heads”. 5. Repeat this process until there are no pennies left. Applying your knowledge a. Graph your data. The sample number will be on the x - axis and the number of decayed atoms per sample will be on the y -axis. Label the axes clearly and provide a title for the graph. b. Describe what your graph looks like. c. How many trials did it take for half of your original number of pennies to decay to “heads up”? d. How many trials did it take for all your pennies to decay? e. Would it make a difference if you graphed the number of “tails” up instead? f. If you were to put a sticker on one of the pennies and repeat the activity, could you predict in which trial the marked penny would decay? g. Another student did this activity, and on the third shake 12 pennies decayed. Can you tell how many pennies the other student started with? Trial Sample Number # of decayed atoms 1 2 3 4 5 6 7 8 9 10 Trial Sample Number # of decayed atoms Chapter 6 Activity
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