# 35.6: General Questions


1. Based on the half-life for each color on the cubes, which of these substances, red, black, or white, do you think would be the most harmful?  Why?

2. The abundance of Carbon-14 in our atmosphere is 1 atom of Carbon-14 per Trillion (1012) atoms.    Analyze our model of bean samples compared to what is found in nature.  Do you think these model samples a good representation of real samples?  Explain.

3. Two rocks are found at different levels in the Earth.  Both contain the isotope $$\ce{_{82}^{210}Pb}$$.  However, one rock contains 1/128th the amount of this isotope as the other rock.  What is the difference in the age of these rocks?  The half-life of $$\ce{_{82}^{210}Pb}$$ is 20.4 years.