This article presents the authors' critique of lessons proposed by the Partnership for 21st Century Skills (P21). The authors initiate a discussion about content that they hope will play out in schoolhouses and statehouses across the country. They take on a different task: they present a handful of lesson ideas from P21 that could enhance studies…

The concept of physical and chemical change is far from being the clearest and most self-explanatory concept in the world. If a number of chemists are asked to define physical and chemical change, there may well appear to be a fair degree of uniformity in their answers, until a few examples are suggested. When chemists are asked to place a variety…