Portable syringe kit demonstration of gas generating reactions for upper secondary school chemistry

Abstract The main purpose of this study is to develop a portable syringe experiment kit for easy demonstration of the chemical kinetics of H 2 , C 2 H 2, and CO 2 gas-generating reactions for upper secondary school chemistry classrooms. The main apparatus comprises two large (A and C) and one small (B) Luer-lock-tip syringes connected with a 3-way stopcock. Ignition is applied to test H 2 and C 2 H 2 gases. In contrast, the turbidity of lime water is used to test CO 2 gas. The effects of reactant species and concentrations on the reaction rates were demonstrated. The syringe kit was implemented through the 5E inquiry learning process for a group of 33 grade 11 students, leading to an improvement in their conceptual test scores on chemical reaction rates from 33.94 % to 78.03 %, with a normalized gain in the medium range (< g = 0.67>). This suggests that using the syringe kit within the 5E inquiry learning framework effectively supported students in developing a more accurate conceptual understanding of reaction rates.