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Be sure to include how radiocarbon dating works backwards to solve a puzzle.

Explain to your friend how you and other archaeologists, with the help of chemistry, determine how old your discoveries are.

Students should complete the Analysis section of the lab sheet, which will be used as part of their assessment.

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They should also understand that the atoms of any element are alike but are different from atoms of other elements.

Atoms may stick together in well-defined molecules or they could be packed together in large arrays.

For the laboratory portion of this lesson, you will have to set up the ring stands, rings, funnels, and graduated cylinders.

Fill the funnels with ice before the students arrive in the classroom.

The exercise they will go through of working backwards from measurements to age should help them understand how scientists use carbon dating to try to determine the age of fossils and other materials.

To be able to do this lesson and understand the idea of half-life, students should understand ratios and the multiplication of fractions, and be somewhat comfortable with probability.Written below is the case as it appears on The Case of the Melting Ice student sheet.The Case of the Melting Ice Frosty the Snowman lies melting in the funnels at your lab station.However, the carbon-14 that was in the organism at death continues to disintegrate.By measuring how much carbon is left in a sample as well as its radioactivity, we can calculate when the organism died. In this activity, you will work backwards to solve a puzzle, much like scientists work backwards to find the time that an organism died." Procedure Give each student a copy of The Case of the Melting Ice student sheet.You can continue to fill the funnels as different classes arrive.