元素推断题是中学化学习题中的一种重要题型,中学化学教学中让学生掌握元素推断题的解法,有利于学生巩固基础知识,培养解题能力.现将元素推断题的常见解法归纳如下:一、推理法例11g某金属置于50mL5mol/L的盐酸溶液中,在化合物中它表现为+2价,当酸的浓度降到1mol/L时,溶液的金属块还没有反应完,试推断该金属元素的名称. Elemental extrapolation questions are an important question type in middle school learning problems. Students in middle school chemistry teaching can grasp the solution of element inference questions, which is helpful for students to consolidate basic knowledge and develop problem-solving abilities. The common solution to element inference questions is summarized as follows: : First, reasoning law 11g a metal placed in 50mL5mol/L hydrochloric acid solution, in the compound it showed +2 valence, when the acid concentration dropped to 1mol/L, the solution of the metal block has not yet finished, try to infer The name of the metal element.