【摘要】 数字化手持技术实验因具有简单便携、易操作、数据实时等优点，在中学化学教学中已经成为一种创新的教学工具，有助于学生化学概念的学习及认知水平的发展.基于数字化手持技术，在考虑了反应吸、放热影响的基础下，利用气压传感器探究了盐酸浓度对Mg与盐酸反应的反应速率的影响，同时考察了催化剂FeCl₃用量、温度对H₂O₂分解反应速率的影响.反应体系“压强-时间”曲线及反应速率的直接对比，利于学生深刻理解反应物浓度、催化剂用量、温度对化学反应速率的影响.更多还原

【Abstract】 With the advantages of simplicity,portability,easy operation and real-time data presentation,the digital hand-held technology experiments has become an innovative teaching tool of the chemistry classroom in secondary schools.It is helpful for students to learn chemical concepts and develop their cognitive level.Based on the digital experiment of hand-held technology,this work adopted gas pressure sensor to explore the effect of HCl concentration on the rate of reaction between hydrochloric acid and magnesium,as well as the effect of dosage of FeCl₃ catalyst and temperature on the decomposition rate of hydrogen peroxide.Since reaction is endothermic or exothermic,effect of heat has been considered along the whole process.The obtained“pressure-time”curves and the calculated reaction rates would offer directly comparison,thus leading to an easy understanding of the influence of reactant concentration,catalyst,and temperature on reaction rate.更多还原