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联想、类推是研究和学习化学知识的一种重要的思维方法,尤以元素化合物知识,总是由个别推出一般,但初学者往往容易进入误区。例如,由Fe+2HCl(稀)=FeCl2+H2类推出:Fe+2HNO3(稀)=Fe(NO3)2+H2Fe+H2SO4(浓)=FeSO4+H2评析铁与稀盐酸或稀硫酸之间的反应属于置
Associations and analogies are an important way of thinking for studying and learning chemical knowledge. In particular, the knowledge of elemental compounds is always introduced by individuals, but beginners are often prone to misunderstandings. For example, from Fe + 2HCl (dilute) = FeCl2 + H2 type out: Fe + 2HNO3 (dilute) = Fe (NO3) 2 + H2Fe + H2SO4 (concentrated) = FeSO4 + H2 Evaluating the reaction between iron and dilute hydrochloric acid or dilute sulfuric acid is set