By the end of the 8th grade, students should know that all matter is made up of atoms, which are far too small to see directly through a microscope.
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.
Here are 10 things you’ll only understand if you’re dating a younger guy: You realize that most people think that age equals maturity. Just because I’m a girl I can’t date someone younger than me?
When they find out my boyfriend is younger, one of the first things people ask me is if he’s immature. I obviously don’t think he’s immature if I’m dating him. People I barely know are always asking me, “But aren’t you worried about you guys not being on the same page? You’ll get used to those moments of realizing your childhoods were just a little different.
Advise students to read through the case first so that they understand what they should do.
Written below is the case as it appears on The Case of the Melting Ice student sheet.
This is something that, for whatever reason, almost always illicits weird reactions from people.
The first lesson, Isotopes of Pennies, deals with isotopes and atomic mass.
The second lesson, Radioactive Decay: A Sweet Simulation of Half-life, introduces the idea of half-life.
Because living things constantly interchange carbon atoms, the amount of carbon-14 remains constant, but when organisms die, no new carbon-14 enters the organism.
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.