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在苏教版必修二“化学反应速率”教学中,影响反应速率的外界因素一般要求是通过实验,联系已学的知识帮助学生定性地认识外界条件对化学反应速率的影响。因此,教材安排了3个演示实验。实验1:取两支大试管,各加入5 mL 12%的过氧化氢溶液(即双氧水),将其中一支试管用水浴加热,观察并比较两支试管中发生的变化。实验2:取两支大试管,各加入5 mL 4%的过氧化氢溶液,用药匙向其中一支试管内加入少量二氧
In the Soviet version of the required two “chemical reaction rate ” teaching, the external factors affecting the reaction rate of the general requirement is through experiments, contact the learned knowledge to help students qualitatively understand the external conditions on the chemical reaction rate. Therefore, the textbook arranged three demonstration experiments. Experiment 1: Take two large test tubes, each adding 5 mL of 12% hydrogen peroxide solution (ie, hydrogen peroxide solution), heat one of the test tubes in a water bath, and observe and compare the changes in the two test tubes. Experiment 2: Take two large tubes, each adding 5 mL of 4% hydrogen peroxide solution, using a spoon to one of the tubes added a small amount of dioxane