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化学实验是一种重要的科学活动,可以把观察、实验控制、收集事实、分析和统计结果等科学方法融为一体。而中学生对事物有天然的好奇心和探究的愿望,学习的行为在很大程度上取决于这种自然倾向的激发。一、Ba(OH)2.8H2O晶体与NH4Cl晶体之间的反应1.学生操作、观察实验现象,并组织语言表达。现象:有刺激性气味的气体产生,感觉烧杯变凉,小木板黏到了烧杯底部,混合物成糊状。学生根据所提供的仪器、试剂等材料,进一步用湿润的红色石蕊试纸检
Chemical experiments are an important scientific activity that integrates scientific methods such as observation, experimental control, collection of facts, analysis and statistical results. Middle school students, however, have natural curiosity and inquiry aspirations for things, and their learning behaviors depend largely on this natural tendency. First, the reaction between Ba (OH) 2.8H2O crystals and NH4Cl crystals 1. Students operate to observe the experimental phenomena and to organize the language expression. Symptoms: gas with irritating odor, feel cool beaker, small wooden stick to the bottom of the beaker, the mixture into a paste. Students according to the provided equipment, reagents and other materials, further with wet red litmus paper test