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化学课外活动形式是多种多样的。教师可依据教学内容,学生水平,拟订课外活动计划,也可根据教学过程中发现或学生提出的问题有针对性地组织课外活动。现介绍我校开展化学课外活动的几个事例,供大家参考。 (一)在学生完成统编高中化学第二册第257页实验六第6题,已掌握了碳酸铝容易水解的性质和认识酸碱灭火器灭火原理的基础上,又演示了硫酸铝水解时溶液也呈酸性的实验。教师提出,能否用硫酸铝代替硫酸,与碳酸氢钠溶液反应,生成灭火物质二氧化碳呢?然后取出事前称好定量的硫酸铝和碳酸氢钠粉末各一小包,分别在两个烧杯里制成溶液,并在某一烧杯里加海鸥洗涤剂(发泡
The form of chemistry extracurricular activities is diverse. Teachers can formulate extra-curricular activities based on the teaching content and student level, and can also organize extra-curricular activities according to the problems found in the teaching process or by students. Here are some examples of chemistry extracurricular activities in our school for your reference. (a) After completing the sixth question of the sixth experiment on page 257 of Experiment No. 2 in Senior High School Chemistry, the students have mastered the nature of the easy hydrolysis of aluminum carbonate and the principle of extinguishment of the acid-alkali fire extinguisher, and demonstrated the solution of the hydrolysis of aluminum sulfate. Also an acidic experiment. The teacher suggested whether aluminum sulfate could be used instead of sulfuric acid and reacted with sodium bicarbonate solution to generate carbon dioxide as an extinguishing substance. Then a small packet of aluminum sulphate and sodium bicarbonate powder, which was weighed in advance, was taken out and made into two beakers. Solution and add seagull detergent in a beaker