This lesson is the third in a three-part series about the nucleus, isotopes, and radioactive decay.The first lesson, Isotopes of Pennies, deals with isotopes and atomic mass.
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 students, understanding the general architecture of the atom and the roles played by the main constituents of the atom in determining the properties of materials now becomes relevant.Having learned earlier that all the atoms of an element are identical and are different from those of all other elements, students now come up against the idea that, on the contrary, atoms of the same element can differ in important ways. 79.) In this lesson, students will be asked to consider the case of when Frosty the Snowman met his demise (began to melt).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.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.You can continue to fill the funnels as different classes arrive.Empty the graduated cylinders between classes if the volume is more than about 25 ml."Carbon-14 undergoes beta decay with a half-life of 5720 years.