Discusses how to use materials that can be found at garage sales in science classrooms. (YDS)

The creation of a simple, low-cost lock-in amplifier (LIA) suitable for use in the chemistry teaching laboratory is described. The use of integrated circuits and few components are necessary to adequately accomplish lock-in amplification limited the total cost of construction to under US$100.

Cognitive development and teaching have highlighted the importance of learning based on the relationship among individuals and the learning environment. Teaching and learning of science in early childhood development and education (ECDE) can only be effective if adequate facilities, materials, equipment and activities are put in place. Teaching of…

A detailed description of the synthesis of bis(1,2-dimethylimidazole)copper(I) hexafluorophosphate by using techniques in a glove box is presented. The results shows that the synthesis of the copper complex has a distinct color change indicating by-product oxidation by oxygen.

The construction of an amperometric biosensor for glucose analysis is described demonstrating that the analysis is easy to perform and the biosensor gives good analytical performance. This experiment helped the students to acquire problem-solving and teamwork skills, allowing them to reach a high level of independent and critical thought.

Describes how to construct a simple bimetallic element and pointer for an overhead projector. The device can be used to demonstrate operation of bimetallic elements. (RH)