# Carbon dating puzzle, why do i have to complete a captcha?

Isotopes have the same chemical properties, but different physical properties. The carbon decays, with its half-life of 5, years, while the amount of carbon remains constant in the sample.

The students will record the results for 9 other groups in their data tables and total all the Trials for the candies NGSS Guided Inquiry Explain about radiation and half-lives of isotopes. Set up a place on the board where all students or groups can record their data. Carbon l dating kdy a half-life of years, which means that if you take one gram of carbon, half of it will decay in years. Seeing this connection will help students to understand how scientists can determine the age of a sample by looking at the amount of radioactive material in the sample.

Have the students record the number of candies they returned to the bag under the next Trial. By looking at the ratio of carbon to carbon in the sample and comparing it to the ratio in a living organism, it is possible to determine the age of a formerly living thing.

## What can I do to prevent this in the future?

Shake the bag and spill out the carbons dating puzzle onto a flat surface. Plot the total results on a graph with number of candies on the vertical axis and trial number on the horizontal axis. Radioactive materials contain some nuclei that are stable and other nuclei that are unstable. Is the result a straight or a curved line?

## The answer has 8 letters: ISOTOPES

Repeat steps 2 through 5 until all the candies have decayed or until you have completed Trial 7. Radiocarbon dates do not tell archaeologists exactly how old an carbon dating puzzle is, but they can date the sample within a few hundred years of the age. The students should repeat steps 2 through 5 until all the candies have decayed or until they have completed Trial 7.

Record the number of candies you returned to the bag under the next Trial. It is a great introduction to the scientific process of deducing, forming scientific theories, and communicating with peers. Students are able to visualize and model what is meant by the half-life of a reaction.

The rate of decay is a fixed rate called a half-life. Sign up for newsletters.