20101004

=Grading= A written explanation is available at this tab:

=Ore into Metal= Visit the simulation pictured at right, courtesy of the BBC. Can you sequence all the steps?

=Chemical vs. Physical Change= What's the difference between iron ore and steel? Between concrete and asphalt? The answer lies in chemical vs. physical changes. We will make tabletop versions of "concrete" and "asphalt" to illustrate this difference!