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对比实验是科学研究中常用的一种实验方法,这种实验的具体做法是把实验分成两组进行对比,两组实验中,除一项条件外,其他的各项条件都相同,这项不同的条件会产生什么影响就是实验中要求了解的。然后把这两组实验的结果进行比较,从而确定该项条件对实验的影响。对比实验的做法是:实验前备齐材料,实验中注重观察,实验后做好记录。如教三年级第五册(义务教育教材)《怎样加快溶解》一课,要通过对比实验认识溶解快慢的条件和认识什么因素会影响溶解速度。课前,准备了十二包颗粒大的盐和十二包研成粉末的盐,高锰酸
Contrast experiment is a commonly used experimental method in scientific research. The specific practice of this experiment is to divide the experiment into two groups. In the two groups of experiments, except for one condition, the other conditions are the same. The difference What conditions will have an impact on the experiment is required to understand. Then the results of these two experiments were compared to determine the impact of this condition on the experiment. Comparison of experimental approach is: prepare the material before the experiment, pay attention to the observation experiment, after the experiment make a record. As teaching third grade fifth volumes (compulsory education textbook) “how to speed up the dissolution of” a lesson, through the comparative experiment to understand the conditions of dissolution and understanding of what factors will affect the dissolution rate. Before class, prepared a packet of 12 large grains of salt and 12 packets of research into powder salt, permanganate