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Direct linkDai, Rucheng; Wang, Zhongping; Zhang, Zengming; Sun, Lazhen – Physics Teacher, 2022
In this paper, an experimental setup composed of a color-mixing device, power supply, and spectrometer is developed. This setup is available for students to do hands-on color mixing with red, green, and blue light in undergraduate labs. LED volt-ampere and spectrum characteristics are investigated. The apparatus was used to perform additive color…
Descriptors: Color, Physics, Science Activities, Undergraduate Students
Janssens, Nikki; Wee, Lik H.; Martens, Johan A. – Journal of Chemical Education, 2014
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.…
Descriptors: Science Instruction, Chemistry, Scientific Concepts, Demonstrations (Educational)
