The esterification reaction of salicylic acid with ethanol is performed in presence of dissolved 12-tungstophosphoric Brønsted-Lowry acid catalyst, a Keggin-type polyoxometalate (POM). The monitoring of the reaction with smell and the recovery of the catalyst with sight is presented. Formation of the sweet-scented ester is apparent from the smell.…

The effect of background color on the perception of color by students is discussed. Explanations on why students only see certain colors when viewing colored marks on a blackboard through different color filters are provided. (KR)

Eighteen science activities that help children learn to use their senses are described. Multisensory activities and single-sensory activities are provided. Each activity includes a list of materials, the procedure, information for the teacher, questions, and a vocabulary list of words often used by children to describe what is taking place. (KR)

Provides background theory and an experiment relating to chemometrics. Describes the phenomenon where solutions are dichromatic or dichromic. Discusses the difficulty students have in describing such solutions that appear to be several different colors at the same time. (TW)

This study compares two methods of instruction in practical school biology. The content remains the same but two teaching methods are used, one based on workstations (Group 1) and the other a conventional approach (Group 2). The content was a regular 9th grade syllabus issue: visual perception. Method 1 included a phenomenological introduction,…