Everyone enjoys seeing the cloudy white fog generated when solid carbon dioxide (dry ice) is placed in water. Have you ever wondered what physical and chemical processes occur to produce this fog? When asked this question, many chemical educators suggest that the fog is produced when atmospheric water vapor condenses on cold carbon dioxide gas…

For students to develop an understanding of science content and processes, teachers must create classroom environments in which students use inquiry to understand the natural world. However, teachers frequently find it difficult, if not impossible, to demonstrate complex scientific concepts, which textbooks often fail to properly explain. During…

A low-cost portable fluorimeter was constructed using a 360 nm LED for excitation and a silicon photodiode for detection. The instrument is simple to operate and has been used to investigate fluorescent whitening agents extracted from various brands of paper, to determine the linear range and limit of detection of quinine in various commercial…

The typical experiment to measure the oxygen content in the atmosphere uses the rusting of steel wool inside a closed volume of air. Two key aspects of this experiment that make possible a successful measurement of the content of oxygen in the air are the use of a closed atmosphere and the use of a chemical reaction that involves the oxidation of…

Documents Swazi students' written explanations of everyday actions in terms of an awareness of the social and economic implications of science, their skills in designing experiments to solve everyday dilemmas, and their abilities to draw on relevant science concepts to solve everyday problems. Finds that considerably less than half of the students…

"How Students Learn: Science in the Classroom" builds on the discoveries detailed in the best-selling "How People Learn." Now these findings are presented in a way that teachers can use immediately, to revitalize their work in the classroom for even greater effectiveness. Organized for utility, the book explores how the principles of learning can…